Monday, September 06, 2010

	09:30 - 12:45	Monday Plenary	Aula Magna
		Chair: A. Renieri

PL.01	09:30	Lasers: Fifty years
		Orazio Svelto Dipartimento di Fisica Politecnico, Italy
		In this talk, some important developments in laser science during the last 50 years will be briefly reviewed. Particular emphasis will be given to some early developments together with a few curiosities and anecdotes drawn from the author’s personal experience. A more detailed account will also be presented about the field of ultrafast laser sciences wherein, during this fifty year period, laser pulse duration has experienced a dramatic reduction from a few picosecond (1 ps = 10-12 s) to a few tens of attoseconds (1 as = 10-18). Lastly, some laser applications will also be considered with emphasis being given to the initial difficulties that lasers met to find their way
PL.02	10:45	Free Electron Lasers- A Historical Perspective
		George Neil Jefferson Lab, United States
		From their beginnings in the microwave tube industry, free electron lasers have developed into high peak and average power devices with output wavelengths extending from the microwave regime to X-rays. This paper will review that development and point out trends for future advances.
PL.03	11:30	THz Quantum Cascade Lasers and their applications
		Qing Hu MIT, United States
PL.04	12:15	From QCL to FELs: a common picture
		Giuseppe Dattoli ENEA, Italy

	14:00 - 15:30	Materials 1	Aula Magna
		Chair: A. Marcelli

Mo-A2.1	14:00	Electrodynamics of Confined Water in Nanospace
		Hiroshi Matsui; N. Toyota Tohoku University, Japan
		By the measurements of microwave conductivity, terahertz transmission and infrared spectroscopy, we clarify that the two-dimensionally confined water forms hexamer cluster in the MnO2 interlayer of Na-birnessite, and the hydration states around PO2- depend on the type of metallic ions of M-DNA.
Mo-A2.2	14:30	Glass-Transition-Induced Lattice Mode Shifts in PVDF and HDPE Observed with Terahertz Time-Domain Spectroscopy
		S. Wietzke1; C. Jansen1; M. Reuter1; T. Jung1; D. Kraft2; S. Chatterjee1; M. Koch1 1Uni Marburg, Germany; 2Süddeutsches Kunststoff-Zentrum, Germany
		Semi-crystalline polymers, such as HDPE or PVDF, are composed of both amorphous and crystalline domains. Here, we apply terahertz time-domain spectroscopy to study the impact of the glass transition taking place in the amorphous phase on lattice modes associated with the crystalline domains.
Mo-A2.3	14:45	Water molecules driven by intense THz pulses
		M. Nagai; K. Tanaka Kyoto University, Japan
		We show THz nonlinearity of liquid water using intense monocycle THz pulse. Single pulse responses and THz pump-probe spectroscopy show that water molecules are coherently driven by THz pulse with breaking hydrogen bonding network.
Mo-A2.4	15:00	Characterization of Phonons in Molecular Crystals
		Andrea Markelz University at Buffalo - SUNY, United States
		We demonstrate a new technique for characterizing the phonons in molecular crystals, Modulated Orientation Sensitive Terahertz Spectroscopy (MOST). The technique suppresses contributions due crystal defects and solvent, and enhances contributions due to molecular structure and anisotropy.
Mo-A2.5	15:15	Coherent Control of Spin Precessional Motion in Yttrium Orthoferrite with Impulsive Terahertz Pulse Excitations
		Keita Yamaguchi; M. Nakajima; T. Suemoto The University of Tokyo, Japan
		Coherent control of spin precession motion using double pulse excitation with THz magnetic pulses has been demonstrated. In addition to enhancement and extinction of the precession, intensity increase of transmitted THz pulse by energy transfer from spin systems was observed in the extinction case.
Mo-A2.6	15:30	Probing Dielectric Relaxation Models of Polar Liquids using Terahertz Time-domain Pulsed Spectroscopy
		Y.W. SUN1; E. Pickwell-MacPherson2 1Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong; 2Department of Electronic & Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong
		The dielectric response of glycerol solution and pure glycerol were measured in terahertz range. It was found that the dielectric relaxation behavior of the glycerol solution is governed by two exponentials, whereas pure glycerol exhibits Davidson-Cole-type relaxation behavior.

	14:00 - 15:30	Detectors 1	Aula Minor
		Chair: R. Leoni

Mo-B2.1	14:00	Room temperature Terahertz hot electron bolometric detector based on AlGaAs/GaAs two dimensional electron gas
		A.E.F. El Fatimy1; P.D.M. Mauskopf1; D.M. Morozov1; C.D. Dunscombe1; T.J. Jones2; K.W. Wood2 1School of School of Physics and Astronomy, Cardiff University, United Kingdom; 2QMC Instruments Ltd, School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom
		in this paper, we present a hot-electron bolometric detector, which uses the nonlinearities of the heated two-dimensional electron gas medium in AlGaAs/GaAs at room temperature. The response was estimated at the 0.1–0.2 THz frequency range , showing possible application in sensing of THz radiation
Mo-B2.2	14:30	THz Power Measurement Traceable to the International System of Units
		Andreas Steiger; B. Gutschwager; C. Monte; R. Müller; J. Hollandt Physikalisch-Technische Bundesanstalt, Germany
		THz power measurements traceable to the International System of Units were missing in the past. Investigations of two optical methods source- and detector-based radiometry led to the design of a new calibration facility for THz detectors with a molecular gas laser and a room-temperature radiometer.
Mo-B2.3	14:45	Improving Photoconductive Receivers for 1.5 µm CW THz Systems
		D. Stanze; H. Roehle; R.J.B. Dietz; H.J. Hensel; D. Schmidt; H.G. Bach; M. Schell; B. Sartorius Fraunhofer Heinrich Hertz Institute, Germany
		Implementation of interdigital electrodes and etching isolating trenches has improved InGaAs/InAlAs photoconductive antennas. The signal-to-noise ratio of continuous wave systems at 1.5 µm has been increased up to 80 dB and its operation range up to 2.1 THz.
Mo-B2.4	15:00	Optimization of high-sensitive THz-wave detection using nonlinear up-conversion in DAST crystal
		Hiroaki Minamide; T.N. Notake; M.T. Tang; Y.W. Wang; H.I. Ito RIKEN ASI, Japan
		In this report, the optimum performance of THz-wave detection using an organic DAST cystal was investigated in parameters such as the thickness of DAST, pump wavelength, and pumping intensity. Consequently, a higher sensitivity was obtained.
Mo-B2.5	15:15	Wafer-bonded Ge:Ga blocked-impurity-band far-infrared detectors
		Yoshihiro Sawayama1; Y. Doi1; R. Kurayama1; E. Higurashi1; M. Patrashin2; I. Hosako2 1The University of Tokyo, Japan; 2National Institute of Information and Communications Technology, Japan
		We report the operation of a blocked-impurity-band (BIB) far-infrared (FIR) photodetector fabricated by surface activated bonding (SAB). The detector shows a high responsivity of ~10 A/W and extended cut-off wavelength compared to a conventional Ge:Ga photoconductor detector.

	14:00 - 15:30	Resonator Devices	Room 2
		Chair: C. Zhang

Mo-C2.1	14:00	Tight-binding description of transmission through crowded terahertz nanoresonators
		Y.M. Park; H.R. Park; H.S. Kim; J.S. Kyoung; K.J. Ahn; D.S. Kim Seoul National University, Korea, Republic of
		We present resonant transmission through rectangular hole array on a metallic film. Transmission spectra broaden with the resonance peaks shifting toward higher frequencies, as the period decreases. The broadening is caused by inter-resonator coupling effects similar to the tight binding model.
Mo-C2.2	14:30	Dielectric characterization by means of whispering gallery mode resonators
		M. Fittipaldi1; E. Strambini2; M. Martinelli2; G. Annino2 1INSTM - Dipartimento di Chimica, Università di Firenze, Italy; 2Istituto per i Processi Chimico-Fisici, CNR, Italy
		The possibility to characterize the complex dielectric permittivity of low-loss materials at millimeter and submillimeter wavelengths by means of a technique based on whispering gallery mode dielectric resonators is discussed, together with some illustrative results.
Mo-C2.3	14:45	Planar Terahertz Waveguides Based on Complementary Split Ring Resonators
		Ajay Nahata; G. Kumar; S. Pandey; A. Cui University of Utah, United States
		We demonstrate a planar THz waveguide formed by periodically structuring a metal film with complementary split ring resonators. We demonstrate both experimentally and numerically that well-guided modes propagate along the device by measuring all of the relevant mode properties.
Mo-C2.4	15:00	Efficient coupling of THz radiation to microdisk resonators
		F. Eichhorn1; A. Patrascu2; G. Leo2; P.U. Jepsen1 1Technical University of Denmark, Denmark; 2Universite Paris Diderot, France
		We model the coupling of THz radiation between a microdisk (MD) resonator and free-space. This is relevant for a new class of THz emitters based on difference-frequency mixing between two laser modes in an MD resonator. We show efficient coupling between the MD TM mode and the free-space TE mode.
Mo-C2.5	15:15	Electrical control terahertz radiation through nanoresonators on VO2
		Y.G. Jeong1; H. Bernien1; J.S. Kyoung1; H.S. Kim1; H.R. Park1; B.J. Kim2; H.T. Kim2; D.S. Kim1 1Seoul National University, Korea, Republic of; 2ETRI, Korea, Republic of
		We demonstrate electrical control of terahertz radiation through nanoresonators on VO2 thin film. By electrically induced insulator-to-metal phase transition, terahertz radiation can be switched-off. Transmission is decreased by two orders of magnitudes even when the film thickness is in nanoscale.

	14:00 - 15:30	Quantum Cascade Lasers 1	Room 3
		Chair: A. Tredicucci

Mo-D2.1	14:00	Photonic Crystals
		Raffaele Colombelli Universite Paris-Sud, France
Mo-D2.2	14:30	Recent progress in THz QC lasers
		Giacomo Scalari ETH, Switzerland
		Recent progress in the design and realization of quantum cascade lasers emitting at THz frequencies will be discussed. High temperature, high power operation and broadband emitters are discussed. THz lasers oscillating in micro-resonators with extremely small modal volumes will be also presented.
Mo-D2.3	15:00	Terahertz pulse generation and amplification within terahertz quantum cascade lasers
		S. Dhillon1; S. Sawallich1; N. Jukam1; D. Oustinov1; J. Madeo1; R. Rungsawang1; S. Barbieri2; P. Filloux2; C. Sirtori2; X. Marcadet3; J. Tignon1 1Ecole Normale Supérieure, France; 2Université Paris 7, France; 3Alcatel-Thales III-V lab, France
		Integrated THz pulse generation and amplification in THz QCLs is demonstrated. Intracavity narrowband THz pulses are generated at 2.1THz by exciting the facet of a THz quantum cascade laser with a resonant interband-intersubband transition and detected using electro-optic sampling.
Mo-D2.4	15:15	Injection locking of Terahertz quantum cascade lasers via RF amplitude modulation up to 35GHz
		P. Gellie1; S. Barbieri1; J.F. Lampin2; P. Filloux1; C. Manquest1; C. Sirtori1; I. Sagne3; S.P. Khanna4; E.H. Linfield4; H.E. Beere5; D.A. Ritchie5 1University of Paris VII - CNRS, France; 2Laboratoire IEMN, Université de Lille 1 and CNRS, France; 3Laboratoire LPN, France; 4School of Electronic and Electrical Engineering, University of Leeds, United Kingdom; 5Cavendish Laboratory, University of Cambridge, United Kingdom
		We demonstrate that the round-trip frequency of THz quantum cascade lasers can be injection-locked via RF amplitude modulation. Devices with roundtrip frequencies up to 35GHz showed locking bandwidths >200MHz. Inside the locking range the round-trip frequency is phase-locked to the RF-synthesizer.

	14:00 - 15:30	Plasma based sources	Room 7
		Chair: G. Dattoli

Mo-E2.1	14:00	Demonstration of High Power Terahertz Sources Driven by Intense Femtosecond Lasers
		Yutong Li; C. Li; M. Zhou; X. Lin; F. Liu; F. Du; S. Wang; L. Chen; J. Ma; Z. Wang; Z. Wei; Z. Sheng; J. Zhang Institute of Physics, CAS, China
		We demonstrate an intense plasma-based THz source using ~5 TW femtosecond laser pulses to irradiate solid targets. The energy of a single THz pulse increases with the laser energy. The maximum THz energy can be as high as tens μJ/sr. The polarization of the THz pulse is measured to be linear.
Mo-E2.2	14:30	Extreme-bandwidth THz Pulses from Laser-Generated Air Plasmas
		V. Blank; M.D. Thomson; H.G. Roskos Physikalisches Institut, Goethe-Universität Frankfurt, Germany
		We demonstrate the generation of coherent terahertz radiation with a continuous spectrum covering the range up to above 100 THz, using an air-plasma with sub-20-fs two-color optical excitation. The pulse energies obtained are sufficient to achieve peak fields of at least 60 MV/cm.
Mo-E2.3	14:45	The Role of Multiphoton Ionization by Bicolor Laser Pulses in the Description of THz Pulse Generation from Laser Breakdown Plasma
		Alexander Shkurinov1; A.V. Borodin1; M.N. Esaulkov1; I.A. Kotelnikov2 1Department of Physics, M.V.Lomonosov Moscow State University, Russian Federation; 2Budker Institute of Nuclear Physics, Russian Federation
		The ITM is used to describe the MI of atoms of gases under the bicolor femtosecond laser irradiation. The obtained formulas are applied for the qualitative explanation of recent experiments on the generation of THz radiation from an optical breakdown in a focus spot of a femtosecond laser in a gas.
Mo-E2.4	15:00	THz Generation in Plasmas Using Two-Color Laser Pulses
		Phillip Sprangle1; J. Penano1; D. Gordon1; B. Hafizi2; P. Serafim3 1Naval Research Laboratory, United States; 2Icarus Research, Inc, United States; 3Northeastern University, United States
		We analyze the generation of THz radiation when an intense, short laser pulse is mixed with its frequency-doubled counterpart in plasma. We use the THz driving current to determine the electromagnetic field characteristics such as spectral intensity, electric field amplitude and directionality.
Mo-E2.5	15:15	Broadband Terahertz Emission from Laser-Produced Plasmas
		Nikolay Vvedenskii; V.A. Kostin; A.A. Silaev Institute of Applied Physics, Russian Academy of Sciences, Russian Federation
		We present the review of recent studies of the phenomenon of terahertz waves generation caused by gas ionization with intense femtosecond laser pulses.

	14:00 - 15:30	Free Electron Laser	Room 11
		Chair: J.M. Ortega

Mo-F2.1	14:00	Third Harmonic Lasing on Terahertz NovoFEL
		V.V. Kubarev; G.N. Kulipanov; O.A. Shevchenko; N.A. Vinokurov Budker Institute of Nuclear Physics, Russian Federation
		NovoFEL has recently lased near 70 µm on the third harmonic of the fundamental frequency. By a choice of different optical resonator losses for fundamental and third harmonics and the resonator length, lasing can be forced to occur on both frequencies simultaneously or on either one alone
Mo-F2.2	14:30	FEM with high-selective Bragg resonator based on coupling of propagating and cutoff waves
		N.Y. Peskov1; N.S. Ginzburg1; A.M. Malkin1; A.S. Sergeev1; V.Y. Zaslavsky1; I.V. Zotova1; I.I. Golubev2; S.M. Golubykh2; A.K. Kaminsky2; A.P. Kozlov2; E.A. Perelshtein2; S.N. Sedykh2 1Institute of Applied Physics RAS, Russian Federation; 2Joint Institute for Nuclear Research, Russian Federation
		Bragg FEM with feedback loop including quasi-cutoff wave was studied. Such feedback mechanism improves selectivity of the Bragg resonators and allows advance of FEM into short wavelengths up to THz-band. Operability of Bragg resonator of a novel type has been demonstrated in Ka-band JINR-IAP FEM.
Mo-F2.3	14:45	Nonlinear Dynamics of a Terahertz Band FEL with Advanced Bragg Resonators.
		Andrey Malkin; N.S. Ginzburg; N.Y. Peskov; A.S. Sergeev; V.Y. Zaslavsky; I.V. Zotova The Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), Russian Federation
		Powerful THz band FEL utilizing coupling between the paraxial and the transverse wave beams on the advanced Bragg structures is studied. Modeling of nonlinear dynamics of suggested FEL scheme demonstrates possibility of single frequency regime establishment at the distance between plates of 40λ
Mo-F2.4	15:00	Orotron operation at the second harmonic of the surface wave frequency
		V.L. Bratman; A.E. Fedotov; P.B. Makhalov Institute of Applied Physics of RAS, Russian Federation
		A possibility of the frequency doubling inside the orotron cavity is experimentally demonstrated at the frequency of 190 GHz. The excitation of the surface mode allows a significant reducing the operating current of the orotron mode that is important in the terahertz frequency range.
Mo-F2.5	15:15	Free-Electron Lasers with Profiled Waveguides
		Vitaliy Goryashko Institute for Radiophysics and Electronics, Ukraine
		The operation of a planar FEL-amplifier with an axial magnetic field and an irregular waveguide is studied. It is shown one can improve the efficiency by a factor of five or six if the FEL operates in the magnetoresonance regime and if the irregular waveguide with the optimized profile is used.

	16:00 - 17:45	Materials 2	Aula Magna
		Chair: R. Marcelli

Mo-A3.1	16:00	THz Radiation by Optically Controlled Depolarization in BiFeO3
		Masayoshi Tonouchi Osaka University, Japan
		Terahertz radiation has been observed from BiFeO3 thin films via ultrafast modulation of spontaneous polarization upon carrier excitation with illumination of femtosecond laser pulses.
Mo-A3.2	16:30	Near-field terahertz imaging of ferroelectric domains in barium titanate
		Filip Kadlec; M. Berta; P. Kuzel Institute of Physics, Academy of Sciences Czech Rep., Czech Republic
		We report on results of near-field pulsed THz imaging experiments with a metalized sapphire probe scanning a BaTiO3 multi-domain single crystal. The method is sensitive to the direction of spontaneous polarization, and spatial resolution is better than the dimensions of the probe at its extremity.
Mo-A3.3	16:45	Terahertz Intersubband Transitions in the Conduction Band of Ge/SiGe Multi Quantum Wells
		Yan Busby1; G. Capellini1; F. Evangelisti1; M. Ortolani2; M. Virgilio3; G. Grosso3; G. Pizzi3; A. Nucara4; S. Lupi4; M. De Seta1 1Università di Roma Tre, Italy; 2CNR Istituto di Fotonica e Nanotecnologie, Italy; 3CNR-NEST-INFM, Pisa, Italy; 4Università di Roma La Sapienza, Italy
		We present Terahertz spectroscopy results in the 2-13 THz range on Ge/SiGe Multi Quantum Wells showing clear evidence of bound to bound intersubband transitions in the Ge wells. These results may be relevant for the design of SiGe-based Quantum Cascade emitters in the THz range.
Mo-A3.4	17:00	Infrared and THz study of the hole-doped Cu-O plane in its whole phase diagram
		D. Nicoletti1; P. Di Pietro1; O. Limaj1; P. Calvani1; S. Ono2; Y. Ando3; S. Lupi1 1University of Rome La Sapienza, Italy; 2CRIEPI Institute, Tokyo, Japan; 3Osaka University, Japan
		This paper is a short review of our recent experiments on hole-doped superconducting cuprates. We investigated the in-plane IR and THz properties of a cuprate family over its whole phase diagram in order to obtain information on the mechanisms driving metallic-phase instabilities in these materials.
Mo-A3.5	17:15	Transport properties of Free Carriers in Semiconductors Studied by THz Time-domain Magneto-optical Spectroscopic Ellipsometry
		Kenichi Yatsugi; N. Matsumoto; T. Nagashima; M. Hangyo Osaka University, Japan
		We have developed a technique to deduce effective mass, density and scattering time of free carriers independently with each other by using THz time-domain magneto-optical spectroscopic ellipsometry. The derivation of these parameters for an undoped n-type InAs wafer is demonstrated.
Mo-A3.6	17:30	Calculation of Terahertz Active Normal Modes in Organic Crystals
		A.D. Burnett1; J. Kendrick2; J.E. Cunningham1; A.R. Pearson3; E.H. Linfield1; A.G. Davies1 1School of Electrical and Electronic Engineering, University of Leeds, United Kingdom; 2Institute of Pharmaceutical Innovation, University of Bradford, United Kingdom; 3Astbury Centre for Structural Molecular Biology, University of Leeds, United Kingdom
		THz frequency spectra of a large number of organic compounds have characteristic spectral absorption features, the exact origin of which, in most cases, is unknown. This paper demonstrates the ability of solid-state density functional theory to calculate the origin of THz spectral features

	16:00 - 17:45	Instruments 1	Aula Minor
		Chair: T. Ouchi

Mo-B3.1	16:00	Telecom Technologies for THz Applications - Challenges and Chances
		B. Sartorius; H. Roehle; R. Dietz; D. Stanze; H. Kuenzel; M. Schell Fraunhofer Heinrich-Hertz-Institut, Germany
		THz at 1.5 µm is pushed for replacing Ti:sapphire by pulsed fiber lasers. But telecom technologies offer much more advantages. This paper describes key developments towards telecom based THz systems for real world applications.
Mo-B3.2	16:30	Silicon Micromachining Technology for THz applications
		C. Jung; C. Lee; B. Thomas; G. Chattopadhyay; A. Peralta; R. Lin; J. Gill; I. Mehdi Jet Propulsion Laboratory, United States
		We report here the development of a wafer-level integrated submm-wave receiver front-end by using advanced semiconductor fabrication technologies. We have developed a technique where Si-metal interfaces and wafer-stacking methodology are utilized to enable multi-pixel receiver in the THz range.
Mo-B3.3	17:00	Silicon Based Microfluidic Device for THz Frequencies
		A.J. Baragwanath1; G.P. Swift2; D. Dai1; A.J. Gallant1; J.M. Chamberlain1 1Department of Physics Durham University, United Kingdom; 2Department of Physics, Durham University, United Kingdom
		In this paper we report on the design, fabrication and testing of a silicon based, microfluidic device, for transmission THz-TDS. Testing of the device is accomplished by analysis of primary alcohol/water mixtures. The analysis of biotin solutions has displayed sensitivity of the order of 3 nmol.
Mo-B3.4	17:15	Developments of THz ESR Systems Using a SQUID Magnetometer and a Micro-Cantilever
		Hitoshi Ohta1; T. Sakurai2; M. Fujisawa3; S. Okubo3; E. Ohmichi4 1Kobe University, Molecular Photoscience Research Center, Japan; 2Center for Support to Research and Education Activities, Kobe University, Japan; 3Molecular Photoscience Research Center, Kobe Universty, Japan; 4Faculty of Science, Kobe Universty, Japan
		evelopments of our highly sensitive THz ESR systems are presented. One method is the ESR detection using a micro-cantilever, and we achieved the sensitivity of about 1011 spins/G up to 315 GHz. Another method is the ESR detection up to 315 GHz using a commercial SQUID magnetometer.
Mo-B3.5	17:30	THz time domain spectroscopy based on OSCAT scheme
		Rafał Wilk1; T. Hochrein2; M. Mei1; R. Holzwarth1 1Menlo Systems GmbH, Germany; 2Sueddeutsches Kunststoff-Zentrum, Germany
		We present a THz spectrometer based on a novel scanning technique without any external moveable delay stage. The optical delay between the pump and probe pulses and thus the scanning range is controlled via the repetition rate of the laser source.

	16:00 - 17:45	Imaging 1	Room 2
		Chair: H. Han

Mo-C3.1	16:00	Real-time terahertz color scanner
		T. Yasui1; T. Iwata2; T. Araki1 1Osaka University, Japan; 2University of Tokushima, Japan
		Real-time THz color scanner was proposed based on a combination of non-collinear electro-optical time-to-space conversion and line focusing of a THz beam. The proposed system has the potential to expand the application scope of THz spectral imaging based on its rapid image acquisition rate.
Mo-C3.2	16:30	High Speed Imaging With Time Domain Terahertz
		Irl Duling; D. Zimdars; J. White; S. Williamson Picometrix, LLC, United States
		Time domain terahertz (TD-THz) imaging provides rich data about the item being imaged. By processing the reflected pulse, spectroscopic and internal structural information can be generated. The problem has always been speed. Recent advances allow images to be collected in seconds, rather than hours.
Mo-C3.3	16:45	THz QCL - based active imaging applied to composite materials diagnostic
		F. Destic1; S. Massenot1; Y. Petitjean1; J.C. Mollier1; S. Barbieri2 1Universite de Toulouse, ISAE, France; 2Universite Paris-Diderot, MPQ, France
		This paper presents a CW raster-scanning THz imaging setup, based on a 2.5 THz Quantum Cascade Laser, used to perform Non-Destructive Testing of Kevlar and carbon fibre samples. Delamination defect in Kevlar showing a polarization dependence and a break in carbon fibres were detected.
Mo-C3.4	17:00	Application of the InGaAs-based bow-tie diodes for Terahertz imaging
		I. Kašalynas; R. Simniškis; D. Seliuta; V. Tamošiūnas; G. Valušis Centre for Physical Sciences and Technology, Semiconductor Physics Institute, Lithuania
		The bow-tie InGaAs diode with broken symmetry was demonstrated for terahertz imaging at room temperature. The voltage-induced capacitance effects important for the diode operation in a real time mode were considered.
Mo-C3.5	17:15	Sub-terahertz Imaging of a Painted Steel
		T. Kurabayashi1; S. Sakai2; K. Fujino2 1Iwate Prefectural University, Japan; 2Nippon Expressway Research Institute Company Ltd., Japan
		Sub-terahertz imaging of a painted steel plate as a method of nondestructive inspection was performed using a wave ranging from 100 to 200 GHz. An invisible rusty area covered with multiple paint layers on steel in actual use was effectively detected by power-reflection imaging.
Mo-C3.6	17:30	CCD-camera-based electro-optical detection of nanosecond THz pulses from an optical parametric oscillator
		F.Z. Meng1; M.D. Thomson1; D. Molter2; T. Löffler3; J. Jonuscheit2; R. Beigang2; J. Bartschke4; T. Bauer4; M. Nittmann4; H.G. Roskos1 1Johann Wolfgang Goethe-Universität, Physikalisches Institut, Germany; 2Department of Terahertz Measurement and Systems, Fraunhofer Institute for Physical Measurement Techn, Germany; 3Physikalisches Institut, Johann Wolfgang Goethe-Universität, Germany; 4Xiton Photonics GmbH, Germany
		We report realization of a THz camera based on electro-optical detection of THz radiation from an optical parametric oscillator, using a silicon-based CCD camera as the optical detector. The dynamic range of 16.5 dB for a 6000-frame average (2-minute data acquisition time) is limited by laser noise.

	16:00 - 17:45	Quantum Cascade Lasers 2	Room 3
		Chair: G. Scamarcio

Mo-D3.1	16:00	Phase-locking of 2.4 and 2.7 terahertz quantum cascade lasers to a femtosecond mode-locked Er-fiber laser
		S. Barbieri1; P. Gellie1; G. Santarelli2; M. Ravaro1; M. Amato1; C. Manquest1; C. Sirtori1; R. Colombelli3; S.P. Khanna4; E.H. Linfield4; H.E. Beere5; D.A. Ritchie5 1University of Paris VII - CNRS, France; 2LNE-SYRTE, CNRS, UPMC, Observatoire de Paris, France; 3IEF, Université Paris Sud and CNRS, France; 4School of Electronic and Electrical Engineering, University of Leeds, United Kingdom; 5Cavendish Laboratory, University of Cambridge, United Kingdom
		We demonstrate the phase-locking of Quantum Cascade Lasers emitting at 2.4 and 2.7Terahertz, to the repetition rate of a commercial Er-doped fiber-fs-laser. We observe a linewidth of the beat-note signal with a signal-to-noise of 80dB in 1Hz bandwidth.
Mo-D3.2	16:30	Gain switching of a terahertz quantum cascade laser for THz pulse amplification
		D. Oustinov1; N. Jukam1; R. Rungsawang1; J. Madeo1; S. Barbieri2; C. Manquest2; C. Sirtori2; S.P. Khanna3; E.H. Linfield3; A.G. Davies3; J. Tignon1; S. Dhillon1 1Ecole Normale Supérieure, France; 2University Paris 7, France; 3University of Leeds, United Kingdom
		The population inversion of a terahertz quantum cascade laser is placed out of equilibrium using an integrated Auston switch. As a result, the dynamic gain of the laser is no longer clamped at threshold by the mirror losses, and large amplification of input terahertz probe pulses is observed.
Mo-D3.3	16:45	Gain studies of phonon-depopulation based terahertz quantum cascade lasers using terahertz time domain spectroscopy
		S. Dhillon1; N. Jukam1; D. Oustinov1; J. Madeo1; R. Rungsawang1; R. Collombelli2; P. Dean3; M. Salih3; S.P. Khanna3; E.H. Linfield3; A.G. Davies3; J. Tignon1 1Ecole Normale Supérieure, France; 2Université Paris Sud, France; 3University of Leeds, United Kingdom
		Gain and losses in a LO-phonon THz QCL are studied using TDS. At threshold the gain clamps at 25cm-1 and the gain FWHM is 0.6THz. At low biases, absorption features are observed below and above the laser frequency. They are shown to originate from the population of a parasitic electronic channel.
Mo-D3.4	17:00	Terahertz Quantum Cascade Laser in the InGaAs/GaAsSb Material System
		C. Deutsch; A. Benz; H. Detz; M. Nobile; A.M. Andrews; P. Klang; W. Schrenk; G. Strasser; K. Unterrainer Vienna University of Technology, Austria
		We demonstrate a terahertz quantum cascade laser based on the aluminum-free InGaAs/GaAsSb material system. Processed in a double-metal waveguide configuration, devices reach operating temperatures up to 105 K and the spectral emission lies between 3.6 and 4.1 THz.
Mo-D3.5	17:15	Coupling strategies for two dimensional coherent semiconductor arrays
		C. Schwarzer1; E. Mujagic1; Y. Yao2; J. Chen2; C. Gmachl2; G. Strasser1 1Institute for Solid State Electronics, Vienna University of Technology, Vienna, 1040, Austria; 2Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, United States
		We present fundamental approaches for realizing coherent two dimensional quantum cascade laser arrays by utilizing ring cavity surface emitting lasers. In this work we describe the design and fabrication as well as the electro-optical characterization.
Mo-D3.6	17:30	Terahertz quantum cascade lasers with angled facets for monolithic integration
		M. Salih; P. Dean; J. Cunningham; S.P. Khanna; L. Li; L. Chen; A.G. Davies; E.H. Linfield LEEDS UNIVERSITY, United Kingdom
		We report the performance of 3.5 THz quantum cascade lasers in which the laser cavities are formed by wet chemical etching and show that laser ridges can be obtained using angled facets. This opens up the possibility of monolithic integration of quantum cascade lasers into terahertz circuits.

	16:00 - 17:45	Gyrotrons 1	Room 7
		Chair: R.J. Temkin

Mo-E3.1	16:00	Experimental demonstration of a W-band gyro-BWO using a helically corrugated waveguide
		A.D.R. Phelps1; C.R. Donaldson2; W. He2; F. Li2; L. Zhang2; A.W. Cross2; K. Ronald2; A.R. Young2; C.G. Whyte2 1university of strathclyde, United Kingdom; 2University of Strathclyde, United Kingdom
		A gyrotron backward wave oscillator (gyro-BWO) with a cusp electron gun and helically corrugated waveguide operating in the W-band frequency range is presented and experimentally demonstrated. The 1.5A, 40kV axis-encircling electron beam has been measured with the velocity ratio, alpha, calculated t
Mo-E3.2	16:30	Experimental Studies of a Ka-band Second Harmonic Gyroklystron Amplifier
		Pu-Kun Liu Institute of Electronics, Chinese Academy of Sciences, China
		The recent experimental results of a Ka-band second harmonic gyroklystron amplifier are presented. The measured output power is 212kW, 3dB bandwidth is 155MHz, the efficiency is approximately 16% and the gain is about 24dB.
Mo-E3.3	17:00	Design of a Permanent Magnet Gyrotron for Active Denial Systems
		Jeffrey Neilson; M.R. Read; R.L.I. Ives Calabazas Creek Research, United States
		Current W-Band active denial, non-lethal weapon systems use gyrotron sources requiring superconducting magnets. Calabazas Creek Research, Inc. is funded by the U.S. Department of Defense to develop a permanent magnet gyrotron as an alternate source.
Mo-E3.5	17:15	Mode Control for Improved Slotted Peniotron Performance
		Lawrence Dressman1; N.C.L. Luhmann2 1NSWC Crane, United States; 2University of California at Davis, United States
		Though seldom done, the vane angle (along with slot and vane radius) of a slotted cavity can be used to control mode placement. A new peniotron design, incorporating this technique, is proposed for peniotron operation at lower voltage, increased current, and improved mode separation.

	16:00 - 17:45	Astronomy and Environmental Studies 1	Room 11
		Chair: G. Sironi

Mo-F3.1	16:00	The Herschel Space Observatory: Payload, Scientific Program, and First Results
		Alberto Franceschini University of Padova, Italy
		The talk will review the ESA Cornerstone mission Herschel Space Observatory, that has successfully flown on May 14, 2009, and is currently performing its routinary observing programme. Herschel, with its 3.5 metre primary photon collector, is the first 4-meter class cooled telescope in space.
Mo-F3.2	16:30	Search for Continuum Solar Flare Radiation in the Terahertz Range
		Pierre Kaufmann1; V.S. Makhmutov2; Y.I. Stozhkov2; C.G. Gimenez de Castro1; J.P. Raulin1; A.S. Valio1; E. Correia1; T. Villela3; R. Marcon4; A. Marun5; P. Pereyra5 1Universidade Pesbiteriana Mackenzie, Brazil; 2Lebedev Physical Institute, Russian Federation; 3Instituto Nacional de Pesquisas Espaciais, Brazil; 4Universidade Estadual de Campinas, Brazil; 5Complejo Astronomico El Leoncito, Argentina
		Solar bursts sub-THz fluxes increasing with frequency might evidence synchrotron emission from high energy electrons. Knowledge of THz spectral shape is essential to understand the emission mechanisms. THz radiometers are developed for a space mission on a long-duration balloon flight.
Mo-F3.3	16:45	Calibration and Performance of the Aura Microwave Limb Sounder
		Robert Jarnot1; R.E. Cofield1; P.C. Stek1; H.M. Pickett2 1Jet Propulsion Laboratory, United States; 2Jet Propulsion Laboratory (retired), United States
		In this presentation we discuss pre-launch calibrations, in-orbit performance, and lessons learned in regard to calibration performance for the Microwave Limb Sounder experiment on Aura. Based upon these lessons learned, we present plans for improving performance of future instruments of this kind.
Mo-F3.4	17:00	Test Deployment of the PolarBear Experiment
		Paul Richards University of California, United States
		PolarBear is an experiment designed to measure the anisotropy of the polarization of the Cosmic Microwave Background Radiation. It uses a new 3.5 m ground based telescope and a large format array of dual-polarization, antenna-coupled TES bolometers with a frequency-domain multiplexed SQUID readout.
Mo-F3.5	17:15	Measurement of the Complex Dielectric Constant of Volcanic Ash at Millimetre Wavelengths.
		Duncan Robertson; A.B. Rogers; D.G. Macfarlane University of St Andrews, United Kingdom
		A method for determining the dielectric permittivity of volcanic ash at millimetre wavelengths has been developed. This, and preliminary results showing good agreement with 19 GHz data, are presented.
Mo-F3.6	17:30	Recent Progress in Commercial Cryogen-free THz Detectors and Large Format Arrays
		Ken Wood QMC Instruments Ltd., United Kingdom
		we present results of the recent incorporation of new superconducting THz detector technologies into novel cooling platforms which do not require liquid cryogens.

	17:45 - 19:15	Monday Poster	Chiostro

Mo-P.01	17:45	Intensity modulation of terahertz quantum cascade lasers under below-bandgap optical excitation
		Norihiko Sekine; I. Hosako National Institute of Information and Communications Technology, Japan
		We have investigated the light-current characteristics of terahertz quantum cascade lasers using an external light whose energy is below the bandgap energy of the host material. It is found that light injection induces a large modulation depth, up to 100%.
Mo-P.02	17:45	THz inter-Landau level emission in a quantum cascade structure
		François-Régis Jasnot1; L.A. de Vaulchier2; Y. Guldner2; A. Vasanelli3; C. Sirtori3; M. Beck4; J. Faist4 1Laboratoire Pierre Aigrain, France; 2Laboratoire Pierre Aigrain, Ecole Normale Supérieure, France; 3Laboratoire Matériaux et Phénomènes Quantiques, Université Denis Diderot Paris 7, France; 4Institute of Quantum Electronics, ETH Zürich, Switzerland
		We study a THz quantum cascade structure designed to allow population relaxation between crossing Landau levels from different subbands under perpendicular magnetic field. Electroluminescence measurements show intersubband luminescence as well as inter-Landau level emission (cyclotron emission).
Mo-P.03	17:45	Spontaneous Emission from GaN/AlGaN based Terahertz Quantum Cascade Laser Structure grown on GaN Substrate
		W. Terashima; H. Hirayama Terahertz Quantum Device Laboratory, RIKEN, Japan
		We fabricated Nitrides-based THz-QCL structure grown on GaN substrate. The Output power for QCL on GaN substrate showed ten times higher value than that of QCL on MOCVD-GaN template. We for the first time observed THz spontaneous emission spectrum on the Nitrides-based THz-QCL on injection current.
Mo-P.04	17:45	High temperature performance of a diagonal THz-QCL calculated with non-equilibrium Green�fs function method
		Hiroaki Yasuda1; T. Kubis2; P. Vogl3; I. Hosako1; K. Hirakawa4 1NICT, Japan; 2Purdue University, United States; 3Technical University Munich, Germany; 4University of Tokyo, Japan
		We have calculated the performance of a novel diagonal design-based THz-QCLs with the non-equilibrium Green�fs function method. The diagonal QCL has a THz gain even at 200 K. The main origin for this is that the non-radiative losses are better suppressed than the optical transition.
Mo-P.05	17:45	THz quantum-cascade lasers with superconducting waveguides
		Alexander Benz; M. Brandstetter; C. Deutsch; G. Fasching; K. Unterrainer; A.M. Andrews; P. Klang; W. Schrenk; G. Strasser Vienna University of Technology, Austria
		We present THz quantum-cascade lasers in a superconducting double-metal waveguide. The active region is sandwiched between 300 nm thick Niobium layers. The current-voltage characterisitcs shows a pronounced photon kink at lasing threshold.
Mo-P.06	17:45	THz photonic crystal quantum-cascade lasers: Frequency tuning during lasing operation
		Alexander Benz; M. Brandstetter; C. Deutsch; G. Fasching; K. Unterrainer; A.M. Andrews; P. Klang; W. Schrenk; G. Strasser Vienna University of Technology, Austria
		We present a new tuning scheme for THz quantum-cascade lasers based on active photonic crystal (PhC) resonators. An injected gas changes the resonance condition of the PhC and thereby the emission frequency of the device.
Mo-P.07	17:45	Operation of a Ka-band harmonic multiplying gyrotron traveling wave tube
		J.R.L. Luo; Y.S. Zhang; W. Guo; M. Zhu; G.J. Yuan; J. Cui; Y.H. Zhang; L.H. Ren; J.X. Yang Institute of Electronics, Chinese Academy of Sciences, China
		A harmonic multiplying gyro-TWT are reported with coupled cavity and the precise control of focusing magnet field to improve the coupling between the fundamental and the harmonic and to adapt the sensitivity of the effect of focusing magnet field on the beam-wave interaction.
Mo-P.08	17:45	Simulation of the axis-encircling Cusp electronic gun for Ka-band Gyro-TWT using three folded helical corrugation waveguide
		wenqiang Lei Institute of Applied Electronics, China
		The Cusp gun for Ka band Gyro-TWT is simulated by a 3D PIC code, in which the electronic velocity value is extracted to calculate the velocity ratio. The gun is optimized in 98kV voltage and 1A current, to obtain 1.1 velocity ratio and 5% spread. The result is used in helical waveguide Gyro-TWT.
Mo-P.09	17:45	Simulation of a Four-stage Depressed Collector for a W-band Gyro-BWO
		L. Zhang1; W. He1; A.W. Cross1; A.D.R. Phelps1; C. Donaldson1; K. Ronald1; C. Donaldson2; K. Ronald2 1SUPA, Department of Physics, University of Strathclyde, United Kingdom; 2University of Strathclyde, United Kingdom
		To improve the overall efficiency of a W-band gyrotron backward wave oscillator (gyro-BWO) currently been built in university of Strathclyde, an energy recovery system using a four-stage depressed collector was simulated and designed.
Mo-P.10	17:45	A W-Band Gyro-TWA using a Helically Corrugated Waveguide
		W. He; A.D.R. Phelps; C.D. Donaldson; A.W. Cross; K. Ronald; L. Zhang SUPA, Department of Physics, University of Strathclyde, Glasgow, United Kingdom
		A gyrotron travelling wave amplifier with a cusp electron gun and a helically corrugated waveguide operating in the W-band is presented. When driven by the 40 keV, 1.5 A e-beam, the amplifier was simulated to output 5-10 kW with a 3dB frequency bandwidth of 90-100 GHz and saturated gain of 40 dB.
Mo-P.11	17:45	Simulations of Ka-band waveguide components for use in a gyro-travelling wave amplifier
		C.W. Robertson; A.D.R. Phelps; C.G. Whyte; A.R. Young; K. Ronald; A.W. Cross University of Strathclyde, United Kingdom
		Abstract—We present the results of a series of CST Microwave Studio computer simulations of waveguide components for a gyro-TWA operating in the Ka-band (26.5-40GHz) frequency range. The components studied include circular to helical waveguide transitions and microwave severs.
Mo-P.12	17:45	Investigations on Wave Propagation in Launchers of Advanced Gyrotron Output Couplers
		J. Flamm1; J. Jin1; J. Neudorfer2; S. Roller2; M. Thumm1 1Karlsruhe Institute of Technology, Germany; 2German Research School for Simulation Sciences GmbH, Germany
		In this paper, we present the latest results on an FFT based method for fast calculation in a rippled-wall overmoded circular waveguide. These are compared with the results of a high-order discontinuous Galerkin method solving Maxwell's equations.
Mo-P.13	17:45	Microwave Cherenkov Radiation from a Particle-in-flight to a Semi-infinite Layered Medium
		Levon Grigoryan1; A.R. Mkrtchyan1; H.F. Khachatryan1; S.R. Arzumanyan1; W. Wagner2 1Institute of Applied Problems in Physics, Armenia; 2Forschungszentrum Dresden-Rossendorf, Institute of Radiation Physics, Germany
		Some part of the microwave Cherenkov radiation from a particle-in-flight from vacuum to semi-infinite layered medium is redirected by the periodical structure of medium in the backward direction. This part of radiation is quasi-monochromatic.
Mo-P.14	17:45	Wave Amplification via a Coaxial Electrostatic Wiggler Pumping Both Kinetic energy and Potential Energy of Electron Beam
		Shi-Chang Zhang Institute of Photoelectronics, China
		Electrostatic potential of the electrons in a coaxial electrostatic wiggler plays important role in the beam-wave interaction. Simulations show ultrahigh-gain mechanism via the electrostatic wiggler pumping both the kinetic energy and electrostatic potential energy of the electron beam to the wave.
Mo-P.15	17:45	Motion and Potential Energy of Relativistic Electrons Modulated by a Coaxial Electrostatic Wiggler
		Shi-Chang Zhang Institute of Photoelectronics, Southwest Jiaotong University, China
		Field expression in the coaxial electrostatic wiggler is derived , which has similar distribution with that in a magnetostatic wiggler. Nonlinear simulations show that the coaxial electrostatic wiggler efficiently modulates the motion and electrostatic potential energy of the relativistic electrons.
Mo-P.16	17:45	THz detectors with HgTe and InSb quantum wells
		F. Gouider1; Y.B. Vasilyev2; J. Könemann3; C. Brüne4; H. Buhmann4; P.D. Buckle5; G. Nachtwei1 1Institut für Angewandte Physik, Technische Universität Braunschweig, Germany; 2A. F. Ioffe Physical Technical Institute, RU-194021 St. Petersburg,, Russian Federation; 3Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig,, Germany; 4Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Germany; 5QinetiQ Ltd, Malvern WR14 3PS, United Kingdom
		THz-frequencies in semiconductor quantum wells are of interest due to the potential for making devices that operate at THz frequencies. We present magnetotransport and magnetooptical data obtained in the magnetic field range 0 < B < 7T at QH detectors patterned as Corbino rings on InSb and HgTe QWs.
Mo-P.18	17:45	Evaluation of a Terahertz Detector based on a Superconducting Tunnel Junction Coupled to a Thin Superconductor Film
		Seiichiro Ariyoshi1; T. Taino2; A. Dobroiu1; H. Sato1; H. Matsuo3; C. Otani1 1RIKEN, Japan; 2Saitama University, Japan; 3National Astronomical Observatory, Japan
		The principle of a superconducting terahertz detector is verified. We have detected terahertz radiation based on the Cooper-pair breaking process, and confirmed that the sensitivity has a sharp increase around 0.7 THz, a value that is in agreement with the gap frequency of the superconducting Nb.
Mo-P.19	17:45	Micromachined Arrays of Air-bridge GaAs Schottky Diodes for THz Cameras
		C.R. Casini Roberto1; D. Dominijanni1; M. Ortolani1; E. Giovine1; F. Gatta2; A. D'Amico2; V. Foglietti1 1CNR-IFN, Italy; 2UNIVERSITY OF ROME "TOR VERGATA", Italy
		We present the fabrication and test of arrays of GaAs Schottky diodes with sub-micrometric junction area and negligible parasitic capacitances working as rectifying detectors at sub-THz frequencies. GaAs Micromachining techniques are used to decrease the cross talking between adjacent diode detector
Mo-P.20	17:45	A new method of terahertz detection: probe-energy electro-optic sampling
		G.K. Kitaeva1; S.P. Kovalev1; I.I. Naumova1; R.A. Akhmedzhanov2; I.E. Ilyakov2; B.V. Shishkin2; E.V. Suvorov2 1M. V. Lomonosov State University, Russian Federation; 2Institute of Applied Physics, Russian Academy of Sciences, Russian Federation
		Implementation of free-space electro-optic detection is reported, based on measuring the energy variation of a femtosecond laser pulse induced by a terahertz field. Scheme of detection is demonstrated using wide-aperture periodically poled Mg:Y:LiNbO3 (PPLN) crystals and a ZnTe crystal.
Mo-P.21	17:45	Hot Electron Bolometer Waveguide Mixers for 1 to 3 THz
		P. Pütz; C.E. Honingh; K. Jacobs; M. Justen; F. Schomaker; M. Schultz; S. Wulff; J. Stutzki 1. Physikalisches Institut, KOSMA, Universität zu Köln, Germany
		We report on measurement results of our latest waveguide mixer developments for the German Receiver for Astronomy at THz frequencies (GREAT), one of the first light instruments of the Stratospheric Observatory for Infrared Astronomy (SOFIA), and for the Stratospheric THz Observatory (STO).
Mo-P.22	17:45	Optimization of Photoresponse and Crosstalk for Mid-wavelength InSb Infrared Focal Plane Arrays
		n. guo1; c. meng2; w.d. hu1; y.q. lv2; x.s. chen1; w. lu1 1Shanghai Institute of Technical Physics,Chinese Academy Sciences, China; 2Luoyang Optoelectronic Institute, Luoyang, Henan, China
		Effects of the pixel crosstalk on photoresponse for mid-wavelength InSb infrared focal plane arrays have been numerically studied. Our work shows that the pixel crosstalk increases with the increase of the height of pixel and the thickness of substrate.The optimal value can be found.
Mo-P.23	17:45	Sensitive Detectors of Terahertz Radiation Based on Pb1-xSnxTe(In)
		Dmitry Khokhlov Moscow State University, Russian Federation
		Indium doped lead telluride-based photodetectors have demonstrated extremely high performance in the terahertz range. These materials reveal a number of advantageous features: “internal” accumulation of the incident radiation, high spatial and temporal stability, high radiation hardness and others
Mo-P.24	17:45	Superconducting Integrated THz Receiver
		Andrey Khudchenko1; V.P. Koshelets1; P.N. Dmitriev1; L.V. Filippenko1; N.V. Kinev1; P. Kudryashov1; O.S. Kiselev1; M.Y. Torgashin1; G. de Lange2; L. de Jong2; P.A. Yagoubov2 1The Kotel’nikov Institute of Radio Engineering and Electronics, Russian Federation; 2Netherlands Institute for Space Research, Netherlands
		Abstract—A Superconducting Integrated Receiver (SIR) developed for balloon borne instrument TELIS covers frequency range 450-650 GHz. The DSB noise temperature was measured as low as 120 K. The SIR application for high resolution spectroscopy of breathed out air has been proven.
Mo-P.25	17:45	Electrically Switchable Optical Response in Graphene
		C. Zhang; S. Sultan; R. Vickers; F. Gao University of Wollongong, Australia
		We carried out a theoretical and computation study of optical response of graphene over a wide frequency range, from terahertz to ultraviolet. It is shown that due to the massless Dirac Fermion properties, the optical response of graphene is electrically switchable.
Mo-P.26	17:45	Terahertz luminescence under continuous wave interband excitation of semiconductors
		Alexamder Andrianov; A.V. Andrianov A.F. Ioffe Physical Technical Institute, Russian Federation
		We report on the observation of efficient terahertz emission from semiconductors (n-GaAs) under continuous-wave interband excitation at liquid helium temperatures. The external quantum yield of the emission is up to 0.3%.
Mo-P.27	17:45	Identification of Textile Fiber by Terahertz Spectroscopy
		T. Kurabayashi1; F. Saitoh2; N. Watanabe3; T. Tanno1 1Iwate Prefectural University, Japan; 2Research and Development Division, Koiwai Farm, Ltd., Japan; 3Research Institute for Quality Living Co., Ltd., Japan
		Absorption spectra of a majority of textile fibers are distinguishable by THz spectroscopy, even for fibers in the same category or species. The advantage of this technique is its sensitivity to the structural differences of the textile fibers, even if they consist largely of the same components.
Mo-P.28	17:45	Validation of thick materials having high refractive indices as high-resistance silicon plates with THz-TDS
		Keiko Kitagishi Otsuka Electronics Co. Ltd., Japan
		Evaluation of complex refractive index of high-n materials was attempted by THz-TDS. The properties were estimated adequately when THz waves radiate in parallel flux, while those were improper with converged waves. The system was designed to easily exchange the parallel/converged configuration.
Mo-P.29	17:45	Neural Network-based Non-destructive Quantification of Thin Coating by Terahertz Pulsed Imaging in the Frequency Domain
		Yaochun Shen1; S. Zhong2; R.K. May3; M.J. Evans4; J.A. Zeitler3; D. Dey5 1University of Liverpool, United Kingdom; 2Department of Electrical Engineering and Electronics, University of Liverpool, L69 3GJ, UK, United Kingdom; 3Department of Chemical Engineering and Biotechnology, University of Cambridge, CB2 3RA, UK, United Kingdom; 4TeraView Ltd., St. John¡¯s Innovation Park, Cambridge CB4 0WS, UK, United Kingdom; 5Oystar Manesty, Merseyside L34 9JS, UK, United Kingdom
		We present a Neural Network (NN) based method for determining the coating thickness from the FFT-amplitude of the measured terahertz waveform. The experimental results demonstrate that the NN-based method can be used to characterize the tablet coating with a thickness down to about 20 microns.
Mo-P.30	17:45	Visualization of Carbon Black Distribution in Rubber Vulcanizates by Terahertz Time-Domain Spectroscopy
		Yasuyuki Hirakawa1; Y. Ohno1; T. Gondoh1; T. Mori1; K. Takeya2; M. Tonouchi2; H. Ohtake3; T. Hirosumi3 1Kurume National College of Technology, Japan; 2Institute of Laser Engineering, Osaka University, Japan; 3AISIN SEIKI Co., Ltd., Japan
		The distribution of carbon black (CB) in rubber vulcanizates containing several additives such as carbon black, ZnO, etc. was estimated by terahertz time-domain spectroscopy. It was found that the CB distribution could be clearly visualized and the THz measurements indicated high reproducibility.
Mo-P.31	17:45	Gyrotrons FU CW V and FU CW VIII for measurement of hyperfine structure of positronium
		Toshitaka Idehara1; Y. Urushizaki1; I. Ogawa1; R. Ikeda1; S. Sabchevski1; S. Asai2; T. Suehara2; A. Miyazaki2; T. Yamazaki2; T. Kobayashi2; T.H. Chang3 1University of Fukui, Japan; 2The University of Tokyo, Japan; 3National Tsing Hua University, Japan
		For direct measurement on hyperfine structure of positronium, high power sub-THz radiation sources have been developed. Gyrotron FU CW V is a frequency fixed gyrotron operating at 203.3 GHz for the proof-of-principle experiment and Gyrotron FU CW VIII a frequency tunable to measure it directly.
Mo-P.32	17:45	The Phonon Absorption Bands of KDP, NBP and PTB Crystals
		Bihui HOU1; W. Wang2 1Beijing University of Technology, China; 2Graduate University of Chinese Academy of Sciences, China
		The phonon absorption bands of three oxide crystals, KH2PO4(KDP), Na5B2P3O13 (NBP) and PbB4O7 (PTB), have been studied and compared from the ultraviolet-visible- infrared- THz transmission spectra.
Mo-P.33	17:45	The Reflectance and Electrical Properties of Nanocrystalline Thulium
		Fengyan LIU; H. Hou Beijing University of Technology, China
		The reflectance spectra within 200nm- 2500nm wavelength range of the two nanocrystalline bulk metal thulium(Tm) samples were studied. The reflectivities of Sample 1 and Sample 2 reach their minima 2.383% at 256nm and 3.439% at 214nm respectively.
Mo-P.34	17:45	Study of CaCO3-containing Minerals by THz Spectroscopy
		M. Mizuno; K. Fukunaga; S. Saito; I. Hosako National Institute of Information and Communications Technology, Japan
		We measured the absorption spectra of the cuttlebone, which contains CaCO3 (~85%), in the terahertz band and compared them with those of natural CaCO3 (calcite). From these results, we state that absorption spectra can be used to identify various crystal states of the cuttlebone.
Mo-P.35	17:45	Quantitative Measurement Captan and Riadimefon Residue by Terahertz Time-domain Spectroscopy
		Q. Wang Dept. of Quality & Safety Engineering, China Jiliang University, China
		THz-TDS was used to measure terahertz far-infrared spectral characteristics of two pestcides(captan, riadimefon) .From experimental results, a series of characteristic absorption peaks can be observed between 0.2 THz and 3.0 THz. It help to identify and quantitative measurement pestcide residue.
Mo-P.36	17:45	Characterizing electronic properties of low and high conductivity materials in the THz regime
		B.B. Yang; S.L. Katz; K.J. Willis; I. Knezevic; S.C. Hagness; J.H. Booske University of Wisconsin-Madison, United States
		We present a combined experimental and computational study on effective electrical conductivity at terahertz frequencies. A high-Q quasi-optical resonator is used to experimentally verify the results of a novel EMC/FDTD/MD numerical model.
Mo-P.37	17:45	Terahertz Coherent Scanning Probe Microscope
		Valery Trukhin1; N.N. Zinov’ev2; A.V. Andrianov2; L.L. Samoilov2; A.O. Golubok3; I.D. Sapozhnikov3; M.L. Felsztyn3; V.A. Bykov4 1Ioffe Physical Technical Institute of RAS, Russian Federation; 2Ioffe Physical Technical Institute, Russian Federation; 3Institute for Analytical Instrumentation, Russian Federation; 4Nanotechnology MDT, Russian Federation
		We present a terahertz (THz) scanning probe microscope which combines THz coherent spectrometer and scanning probe microscope. It detects forward-scattered radiation and employs harmonic signal demodulation to extract the signal of near-field contribution to scattering of THz electromagnetic waves.
Mo-P.38	17:45	Terahertz Spectroscopic Characterization of Paper
		T. Hattori; H. Kumon; H. Tamazumi University of Tsukuba, Japan
		THz-TDS of paper was performed. The real and imaginary indices depended on frequency, orientation, type of paper, and moisture content. The attenuation coefficient depended quadratically on frequency. Moisture content dependence was consistent with the complex permittivity of liquid water.
Mo-P.39	17:45	First-principles study of atomic and electronic structures of amorphous HgTe
		H.X. Zhao; X.S. Chen; R.B. Dong; H.B. Shu; W. Lu National Lab for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Scien, China
		The atomic and electronic structures of amorphous-HgTe have been studied. We formed the initial structures by replacing Si atoms in amorphous-Si. The electronic properties are analyzed through the density of states. The density-functional methods predict a small gap of 0.4-0.45 eV for amorphous HgTe
Mo-P.40	17:45	THz-TDS of Filter Paper at Differing Humidities
		Elise Pogson1; A. Scott1; C.J. Garvey2; R.A. Lewis1 1University of Wollongong, Australia; 2bAustralian Nuclear Science and Technology Organisation, Australia
		Characterisation of filter paper using Terahertz Time Domain Spectroscopy is given at different humidities. This is achieved using saturated salt solutions. Measurements are also taken towards the saturated RH% at specific times giving added information on equilibration times and sample properties.
Mo-P.41	17:45	TM310 Mode Coaxial Output Cavity for Ka-band Multiple-beam Klystron
		HuiPeng Han; Y. Wang; R. Zhang; W. Ruan Institute of Electronics, Chinese Academy of Sciences, China
		A coaxial output cavity operating at TM310 mode in Ka-band with reentrant rings and short circuit pole for MBK is presented, which can enlarge dimension, increase the frequency interval between TM310 mode and neighboring modes, diminish the Qext, and make the field distribution symmetrical enough.
Mo-P.42	17:45	Highly Sensitive Determination of Coating Thickness by using the High Filling Factor in an Adiabatically Coupled Terahertz Waveguide
		M. Theuer1; R. Beigang2; D.R. Grischkowsky1 1Oklahoma State University, United States; 2Fraunhofer IPM, Germany
		THz-TDS can be used to detect the thickness of thin layers by pulse delay. The detection limit was considerably increased by using the high filling factor of a THz waveguide. The single pass delay was multiplied by a factor of more than 60 resolving dielectric layers down to 2 micron thickness.
Mo-P.43	17:45	Sub-Terahertz Wave Frequency Converter Design for High Speed Data Transmission
		XianJin Deng; Z. Chen; C. Wang; J. Liu; S.Y. Wu Institute of Electronic Engineering, CAEP, China
		This paper presents a sub-terahertz frequency converter for high speed data transmission, which is composed of a V-band source, a D-band harmonic mixer using Schottky diode. It can be used as an upconverter or downconverter between 110 and 170 GHz, which eliminates the need for high LO source.
Mo-P.44	17:45	Accurate, Continuously Tunable, Terahertz Synthesizer Based on Photomixing of Two Continuous-Wave Lasers Phase-Locked to Two Independent Fiber Combs
		K. Kawamoto1; H. Takahashi2; Y. Iwamoto2; K. Arai2; T. Yasui1; H. Inaba3; K. Minoshima3; T. Araki1 1Osaka University, Japan; 2Tokyo Univ. Sci., Japan; 3AIST, Japan
		A continuously tunable, phase-locked, CW-THz generator has been demonstrated. This CW-THz generator is based on photomixing of an accurately tunable CW laser and a tightly fixed CW laser in the optical frequency region, phase-locked to two independent optical combs.
Mo-P.45	17:45	Phase stability considerations in coherent CW THz photomixing systems
		T. Goebel; D. Schoenherr; C. Sydlo; M. Feiginov; P. Meissner; H.L. Hartnagel Technische Universitaet Darmstadt, Germany
		Wavelength stabilized lasers and the delay stage configuration can significantly influence the phase stability in coherent CW photomixing THz-systems. Depending on the system design, the phase drift can exceed several wavelengths and therefore make the system unsuitable for precise measurements.
Mo-P.46	17:45	THz Balanced Electro-Optic Detection with Two Line-Scan Cameras
		Michael Herrmann1; C. Wiegand2; D. Molter1; J. Jonuscheit1; R. Beigang2 1Fraunhofer Institute for Physical Measurement Techniques IPM, Germany; 2University of Kaiserslautern, Germany
		We have built a THz system for one-dimensional imaging with a THz line focus and electro-optic detection with two line-scan cameras in a balanced arrangement. The system uses pulsed THz radiation from a fast-repetition-rate (80 MHz) femtosecond laser. The THz emitter antenna is electronically chopped.
Mo-P.47	17:45	High-Repetition-Rate Optical Delay Line Using a Micromirror Array and Galvanometer Mirror
		H.K. Kitahara1; M.T. Tani2; M.H. Hangyo1 1Osaka university, Japan; 2University of Fukui, Japan
		We have developed a high-speed optical delay line for the terahertz time-domain spectroscopy system (THz-TDS). The delay line is composed of a galvanometer mirror and a mirror array. We have demonstrated the acquisition of the time-domain wave form by using the delay line and a THz-TDS system.
Mo-P.48	17:45	Foamy-Dielectric Lens Transmission Lines and Polarization Resonators as the Basis Alternative Element Basis of MM and Sub-MM Waves
		Kniazkov Leonid; N.V. Ruzhentsev Institute of Radio Astronomy National Academy of Sciences of Ukraine, Ukraine
		The advantages of the proposed principles of microwave device design on the base of foamy - dielectric lens transmission lines and polarization resonators are demonstrated in mm and submm wave region. This advantages are follow: low losses, simple for manufacturing and adjusting.
Mo-P.49	17:45	Nanosecond Semiconductor Modulator of MM Waves Controlled by an Optical Laser
		Grigory Denisov1; M.L. Kulygin2; Y.V. Rodin2; B.V. Shishkin2; I.E. Ilyakov2 1Institute of Applied Physics/GYCOM, Russian Federation; 2Institute of Applied Physics, Russian Federation
		A report of success in numerical modeling and experimental investigation of a new type of microwave commutation device is presented. The modulator is intended to be used in coherent GHz spectroscopy rather than for powerful microwave power flow switching.
Mo-P.50	17:45	A 203-GHz TE02 mode converter using LIGA technique
		T.H. Chang National Tsing Hua University, Taiwan
		This study reports the development of a broadband TE02 mode converter centered at 0.2 THz. The converter was built using the technique of X-ray micro-fabrication. A computer-aided diagnostic system was introduced. Results suggest that the frequency response of resistivity should be considered.
Mo-P.51	17:45	Development of a Fast Scan THz-TDS System by using a Repetition Rate Tunable Femtosecond Laser
		Takashi Furuya1; K. Horita1; C.T. Que1; K. Yamamoto1; F. Miyamaru2; S. Nishizawa3; M. Tani1 1Research Center for Development of Far-Infrared Region, University of Fukui, Japan; 2Shinshu University, Japan; 3Advanced Infrared Spectroscopy Co., Ltd., Japan
		The long scanning time of a THz-TDS is a problem for quality control application in an industrial production line. In this study, we developed a fast scan system using a repetition rate tunable femtosecond laser. The scan time was around one hundred thousandth shorter than a mechanical delay system.
Mo-P.52	17:45	Analysis of the High Frequency Spreading Resistance for Surface Channel Planar Schottky Diodes
		A.Y. Tang1; P. Sobis2; H. Zhao1; V. Drakinskiy3; T. Bryllert1; J. Stake1 1GigaHertz Centre, Physical Electronics Laboratory, Chalmers University of Technology, Sweden; 2Omnisys Instruments AB, Sweden; 3Physical Electronics Laboratory, Chalmers University of Technology, Sweden
		Spreading resistance of a planar Schottky diode is studied as a function of the frequency and buffer layer thickness. The study shows an increase of effective high frequency resistance for a buffer layer thicker than skin depth, due to the parasitic capacitances induced current in buffer layer.
Mo-P.53	17:45	Terahertz photomixing in Strained Silicon MODFET
		Y.M. meziani1; A. El Moutaouakil2; E. Velazquez1; E. Diez1; K. Fobelets3; T. Otsuji2 1Salamanca University, Spain; 2RIEC, Tohoku University, Japan; 3Electrical and Electronic Engineering Department, Imperial College London, United Kingdom
		Strained-Si modulation doped field effect transistors have been studied as a photomixer within terahertz range. It was subjected to two CW lasers where Δf=|f1-f2|=4 THz. A clear signal was observed with maximum around Vg=-0.15V and interpreted as due to the oscillaions of the plasma waves.
Mo-P.54	17:45	High Power Bend Mode Converter in Overmoded Circurlar Waveguide for Gyroklystron
		Ling Gu Southwest University for Nationalities, China
		Design of TE01¡ªTM11 mode converter geometry configuration with traditional waveguide axis constant curvature and improved waveguide axis sinusoidal curvature is given for more acceptable geometry parameters. The conversion efficiency with waveguide axis sinusoidal curvature is about 99%
Mo-P.55	17:45	Monte Carlo study of ballistic effects in high speed InAs-based quantum hot electron transistor
		giulio sabatini1; C. Palermo1; P. Ziadé1; T. Laurent1; H. Marinchio1; H. Rodilla2; J. Mateos2; T. Gonzales2; R. Teissier1; L. Varani1 1Institut d’électronique du Sud – UMR CNRS 5214, France; 2University of Salamanca, Spain
		By means of a Monte Carlo simulation, we have studied the collector transit region of an innovative InAs/AlSb quantum hot electron transistor. This original vertical transport device has the potential to efficiently exploit the unrivalled transport properties of InAs to reach THz frequencies.
Mo-P.56	17:45	A novel compact linear array scan imaging system
		Wenbin Dou; Z.c. Zhang State Key Lab of Millimeter Waves, Southeast University, China
		A novel compact millimeter wave linear array scanning imaging system, which consists of a rotatable dielectric prism and a lens imaging system, is proposed and simulated. The optical path and spot-patterns of the imaging system are presented. The field-of-view (FOV) of 11.6¡ã¡Á8¡ãhas been obtained.
Mo-P.57	17:45	Enhancement of contrast and spatial resolution in confocal coherent terahertz imaging system.
		Alexander Andrianov; A.V. Andrianov A.F. Ioffe Physical Technical Institute, Russian Federation
		The effect of enhancement of image contrast and spatial resolution without the loss of the spectral composition of the radiation under investigation has been experimentally demonstrated for a terahertz far-field imaging system. The result has been achieved by using a technique of confocal filtering.
Mo-P.58	17:45	Plasmonic Apertures for THz QCL Near-Field Imaging
		A.J. Baragwanath1; J.R. Freeman2; A.J. Gallant3; A. Zeitler4; H. Beere2; D.A. Ritchie2; J.M. Chamberlain1 1Department of Physics, Durham University, United Kingdom; 2Cavendish Laboratory, University of Cambridge, United Kingdom; 3School of Engineering and Computing Sciences, Durham University, United Kingdom; 4Department of Chemical Engineering and Biotechnology, University of Cambridge, United Kingdom
		In this paper we report on the fabrication and testing of sub-wavelength apertures surrounded by annular plasmonic structures, for use in near-field imaging with a QCL source. Preliminary results demonstrate greatly increased transmission when using the plasmonic aperture over a bare aperture.
Mo-P.59	17:45	THz Radiation Based on Femtosecond Electron Bunches and THz Imaging
		J. Saisut1; K. Kusoljariyakul1; N. Kangrang2; P. Wichaisirimongkol3; C. Tengsirivattana2; P. Thamboon3; M.W. Rhodes3; C. Thongbai1 1Department of Physics and Materials Science, Chiang Mai University, Thailand; 2ThEP Center, Commission on Higher Education, Thailand; 3STIR, Chiang Mai University, Thailand
		The THz radiation from femtosecond electron bunches is focused on a sample which will be scanned using xy-translation stages. The transmission intensity at different points of the sample are detected to construct a THz image. The THz images of samples were demonstrated using the THz imaging system.
Mo-P.60	17:45	Non-bias inspection of electrical failures in LSI interconnects using LTEM prototype system
		Masatsugu Yamashita1; C. Otani1; T. Matsumoto2; Y. Midoh3; K. Miura3; K. Nikawa3; K. Nakamae3; M. Tonouchi3 1RIKEN ASI, Japan; 2Hamamatsu Photonics, Japan; 3Osaka University, Japan
		LSI chips fabricated by 180nm process were measured by the LTEM prototype system. P-n junctions connected to the defective interconnect can be successfully identified under non-bias condition. These results indicate LTEM can be a useful tool for the defect localization in LSI failure analysis.
Mo-P.61	17:45	Non-destructive determination of the density distribution of polymer foam models with THz-pulses
		A. Brahm1; D. Schmidt2; S. Riehemann1; F.J. Woestmann2; A. Tuennermann1 1Fraunhofer IOF, Germany; 2Fraunhofer IFAM, Germany
		A study of density and glue distributions in polymer foam models for lost foam casting processes is reported. THz-pulse measurements were compared with destructive measurements according to the principle of buoyancy-floating method to guarantee high quality standards in lost foam casting processes.
Mo-P.62	17:45	Volumetric analyses using terahertz-tomography techniques
		A. Brahm1; M. Kunz2; S. Riehemann1; G. Notni1; A. Tuennermann1 1Fraunhofer IOF, Germany; 2Institute of Physics, Ilmenau University of Technology, Germany
		We report about an algorithm approach to identify substances inside a sample using their complete characteristic absorption spectra from a tomographic measurement with ultrashort THz-pulses.
Mo-P.63	17:45	A Monolithic Visible, Infrared and Terahertz 2D Detector
		M. Perenzoni1; N. Massari1; S. Pocas2; J. Meilhan2; F. Simoens2 1Fondazione Bruno Kessler, Italy; 2CEA-Leti MINATEC, France
		A monolithic multispectral detector for imaging in the visible, infrared and terahertz ranges has been designed for operation at room temperature. This sensor is composed of a CMOS readout integrated circuit with visible photodiodes and of IR and THz microbolometer pixels processed above the CMOS.
Mo-P.64	17:45	Terahertz Imaging Using Intermediate Thermal Screen
		Alexander Klimov1; V.V. Kubarev2; V.N. Shumsky1 1Institute of Semiconductors Physics, Russian Federation; 2Institute of Nuclear Physics, Russian Federation
		Parameters of THz imaging system with the intermediate thermal screen are analyzed. Experimental data on the prototype which uses the highly sensitive PbSnTe:In film as IR photodetector and the microbolometer matrix as the thermal screen are also given
Mo-P.65	17:45	Combined Passive and Active Millimeter-Wave Imaging System for Concealed Objects Detection
		Jordi Abril Aguilera; E. Nova Lavado; T. Broquetas; F. Torres; J. Romeu; L. Jofre Polytechnic University of Catalunya, Spain
		It is expected that the combination of the coherent and incoherent radiation in active and passive operation will offer improved detection and identification of concealed objects. An interferometric radiometer and an active mills-cross have been studied as near field imaging systems.
Mo-P.66	17:45	Compressed terahertz imaging system using a spin disk
		Yaochun Shen1; H. Shen2; N. Newman2; L. Gan3; S. Zhong2 1University of Liverpool, United Kingdom; 2Dept of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK, United Kingdom; 3Electronic and Computer Engineering, Brunel University, Uxbridge UB8 3PH, UK, United Kingdom
		Based on the concept of compressive sensing, a spin disk with random patterns was used to modulate the THz beam pattern, and THz image was subsequently reconstructed. Experimental results will be demonstrated using both BWO THz and thermal light sources covering both infrared and visible range.
Mo-P.67	17:45	3D Spectroscopic Computed Tomography Imaging Using Terahertz Waves
		Eiji Kato1; S. Nishina1; A. Irisawa1; T. Yamashita1; M. Imamura1; K. Kawase2 1Advantest corporation, Japan; 2Nagoya University, Japan
		We have developed a three-dimensional spectroscopic imaging system that uses terahertz waves and is based on transmission computed tomography. Using this system, we demonstrate three-dimensional imaging, with identification for chemical components, by analyzing spectroscopic information.
Mo-P.68	17:45	Design and Simulations of a THz Sensor Based on Micromachined Golay-cell for Imaging Applications
		H. Rashid; V. Desmaris; V. Belitsky Chalmers University of Technology, Sweden
		A novel sensor for room temperature THz imaging is presented. The sensor’s response time (t) is optimized by tuning its structural design, using Monte-Carlo and transient FEM simulations. The final design offers a 3.5THz bandwidth (0.5-4THz) and t of 30ms, suitable for real time radio visualization
Mo-P.69	17:45	Differential Scanning Optical Microscopy with a THz quantum cascade source
		R. Degl'Innocenti; M. Kumar; J.H. Xu; A. Tredicucci NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Italy
		We present a differential Near-field Scanning Optical Microscope (NSOM) operating in the THz spectral region. The system, which employs a quantum cascade laser emitting at λ =105 μm as source, has been tested on metal and graphite objects, with a resolution of ~ λ/10.
Mo-P.70	17:45	Room Temperature Imaging above one Terahertz by Field Effect Transistor as Detector
		Salman NADAR1; H. Videlier2; D. Coquillat2; O. Klimenko2; F. Teppe2; M. Sakowicz2; N. Dyanonova2; W. Knap2; D. Siluta3; I. Kasalynas3; G. Valusis3; S. NADAR4 1Groupe d'Etudes de Semiconducteurs (GES), France; 2GES, France; 3THz groupe, Semiconductor Physics Institute, Lithuania; 4GES UM2, France
		GaAs field effect-transistors are used for single-pixel imaging using frequencies above 1 THz at 300 K. Images obtained in transmission mode at 1.63 THz are recorded with spatial resolution of 300 µm. We demonstrate that, with applied drain to source current, the imaging at up to 2.5 THz is possible
Mo-P.71	17:45	MMIC-based Receivers for MM-wave Radiometry
		Vessen Vassilev1; H. Zirath2; N. Wadefalk2; R. Kozhuharov2; M. Abbasi3; T. Pellikka4; A. Emrich4; I. Kallfass5; A. Leuther5 1Microwave Electronics Laboratory, Sweden; 2Microwave Electronics Laboratory, Chalmers, Sweden; 3Microwave Electronics Laborato, Sweden; 4Omnisys Instruments AB, Sweden; 5Fraunhofer Institute IAF, Germany
		We present results of packaged mm-wave receiver components based on 100nm mHEMT technology. The components are to be used for observations of the atmospheric lines at 118 GHz and 183 GHz.
Mo-P.72	17:45	Consideration of refraction losses for time-domain terahertz computed tomography
		Emmanuel Abraham1; A. Younus2; C. Aguerre3; P. Desbarats3; P. Mounaix1 1CPMOH - Université de Bordeaux, France; 2CPMOH - Université de Bordeaux, Pakistan; 3LaBRI - Université de Bordeaux, France
		Terahertz computed tomography has been performed using a time-domain terahertz spectrometer. Refraction losses induced by the transmission of the terahertz radiation through the samples have been taken into account in order to reconstruct the three-dimensional aspect of complex shape objects.
Mo-P.73	17:45	Discrete Sampling of Continuous Wave Terahertz Radiation
		M. Schwerdtfeger; M. Scheller; M. Stecher; O. Peters; M. Koch Philipps-Universität Marburg, Germany
		We present a cost efficient delay technique for terahertz spectrometers based on discrete phase shifting of the THz wave. This can be achieved by using a polymer disc with segments of different thickness. The approach is demonstrated by measurements with a six segment disc placed in the THz beam.
Mo-P.74	17:45	Non-destructive inspection of opaque objects with a 3D millimeter-wave tomographic scanner
		Emmanuel Abraham1; A. Younus2; S. Salort3; J.P. Caumes3; P. Desbarats4; P. Mounaix1 1CPMOH - Université de Bordeaux, France; 2CPMOH - Université de Bordeaux, Pakistan; 3Alphanov - Université de Bordeaux, France; 4LaBRI - Université de Bordeaux, France
		Flexible monochromatic millimeter wave system coupled with an infrared temperature sensor demonstrates large size 3D visualization of manufactured opaque phantoms with different refractive index contrasts. Peculiarities such as boundary effects, refraction and diffraction losses will be discussed.
Mo-P.75	17:45	Matrix Micro-Golay Cell IR Imager
		Andrei Paulish1; V.N. Fedorinin1; A.V. Gelfand2; S.A. Kuznetsov3 1Novosibirsk Branch of Institute of Semiconductor Physics SB RAS "TDIAM", Russian Federation, Russian Federation; 2Novosibirsk Branch of Institute of Semiconductor Physics SB RAS, Russian Federation; 3Institute of Nuclear Physics SB RAS, Novosibirsk, 630090, Russian Federation, Russian Federation
		The IR imager based on 200×200 matrix structure of the micro-Golay cells and optoelectronic readout system is fabricated and investigated in this work. Radiation temperature sensitivity and noise equivalent power were 0.15 K and 10 nW, respectively, and the response time was below 30 ms.
Mo-P.76	17:45	A 340 GHz CW non-linear imaging system
		Robin Dahlbäck1; T. Rubaek2; T. Bryllert1; M. Persson2; J. Stake1 1Chalmers University of Technology, MC2, Physical Electronics Laboratory, Sweden; 2Chalmers University of Technology, Department of Signals and Systems, Biomedical Engineering Divisio, Sweden
		A CW sub-millimetre wave imaging system is presented. The system operates around 340GHz with a 6.5% relative bandwidth and uses a non-linear imaging algorithm.
Mo-P.77	17:45	Development of Laser Scanning Terahertz Imaging System Using Organic Nonlinear Optical Crystal
		Kazunori Serita1; S. Mizuno1; H. Murakami1; I. Kawayama1; M. Tonouchi1; Y. Takahashi2; M. Yoshimura2; Y. Kitaoka2; Y. Mori2 1Institute of Laser Engineering, Osaka University, Japan; 2Graduate School of Engineering, Osaka University, Japan
		We constructed a laser scanning terahertz (THz) imaging system for high-speed imaging by using a galvano meter and an organic nonlinear optical crystal, DASC, as a two-dimensional THz emitter. Using this system, we succeeded in obtaining high-resolution THz images of a test sample.
Mo-P.78	17:45	High Resolution Terahertz imaging (T-ray) with a Horn Antenna
		G.J. Kim; J.I. Kim; S.G. Jeon; W.K. Han Korea Electrotechnology Research Institute, Korea, Republic of
		We suggest a simple solution the limitation of spatial resolution for wavelength by using a horn antenna and verified detection limitation by THz imaging for a foreign object in flour.
Mo-P.79	17:45	Si-MOSFETs Terahertz Photovoltaic Response in High Magnetic Field
		Hadley Videlier1; O. Klimenko2; M. Sakowicz1; N. Dyakonova1; F. Teppe1; C. Consejo1; D. Coquillata1; W. Knap1; J. Marczewski3; P. Grabiec3; J. Lusakowski4 1GES-UMR5650, Université Montpellier 2 and CNRS, France; 2aGES-UMR5650, Université Montpellier 2 and CNRS, France; 3Institute of Electron Technology, Poland; 4Institute of Experimental Physics, Poland
		Terahertz response of Silicon MOSFETs high magnetic fields is studied. Subjected to a Terahertz radiation, the MOSFET develops a dc drain-to-source voltage that exhibits a resonant structure corresponding to g factor ~2 and can be tentatively interpreted as related to spin effects.
Mo-P.80	17:45	A preliminary study towards the implementation of MIMO radar system for Agriculture applications
		N. Ahmad; J.J. Soraghan UNIVERSITY OF STRATHCLYDE, United Kingdom
		The revolution of MIMO radar system has the potential to be applied in many areas of applications such as in agriculture sector. It is inspired from MIMO system in telecommunications and uses multiple antennas to observe the different aspect of targets, hence produce high resolution radar image.
Mo-P.81	17:45	Terahertz Pulsed Imaging of Surface Variations on Pharmaceutical Tablets
		Axel Zeitler1; R.K. May1; M.J. Evans2; S. Zhong3; C. Byers4; L.F. Gladden1; Y.C. Shen3 1University of Cambridge, United Kingdom; 2TeraView Ltd, Virgin Island (United Kingdom); 3University of Liverpool, United Kingdom; 4Oystar-Manesty, United Kingdom
		We present an analysis of terahertz pulsed imaging measurements of pharmaceutical tablets compacted over a range of compression forces. Using THz imaging it was possible to observe, small-scale defects on tablet surfaces that may have relevance to the quality of tablet manufacture and performance.
Mo-P.82	17:45	Terahertz Phase Image Reconstruction Using an Iterative Algorithm
		Y.X. Wang1; Z.Q. Chen2; Z.R. Zhao2; L. Zhang2; K.J. Kang2; J.K. Deng1 1Department of Physics, Tsinghua University, China; 2Department of Engineering Physics, Tsinghua University, China
		We present a terahertz phase contrast imaging technique based on the iterative phase retrieval method (the Gerchberg¨CSaxton iterative Fourier transform algorithm). Numerical simulations are performed to demonstrate this new imaging concept for conventional terahertz intensity measurement system.
Mo-P.83	17:45	Compact CW-Sub THz Imaging System for Non-destructive Testing
		D.C. Seo; J.S. Jang; I.B. Kwon; D.J. Yoon KRISS, Korea, Republic of
		This paper presents compact CW sub-THz imaging system using terahertz transmitter (Tx) that generating 0.34 THz electromagnetic wave based on electronic device. Using this THz imaging system, we measured transmitting terahertz wave magnitude and phase information of samples for non destructive test.
Mo-P.85	17:45	Analysis of Plasma Resonances in Terahertz Devices with Grating Gate
		Irina Khmyrova; R. Yamase; N. Watanabe University of Aizu, Japan
		Analytical model is developed and used to calculate spatial distribution of sheet electron density in the channel of grid-grating gated HEMT structure and resonant frequencies of plasma waves excited in the channel. It is shown that increasing number of gates results in spectrum broadening .