Terahertz Radiation - optics and crystals [e-mail]

GaP:

ZnTe:

LiNbO3

Featured research:
T-REX (Terahertz Radiation EXperiment):

Coherently controlled THz generation
Sandwiched between the optical and microwave regimes, far infrared or terahertz (1 THz = 1012 Hz) frequency range has recently drawn special attention due to its ubiquitous nature (see Fig. 1). THz radiation (or T-rays) can easily pass through non-polar materials such as clothing, paper, plastics, wood and ceramics. This property allows many applications in molecular sensing, biomedical imaging and spectroscopy, security scanners, and plasma diagnostics. In particular, THz spectroscopy holds great promise for molecular sensing. Recent work on stem cells shows that T-rays have potential for controlling cellular gene expression.

Terahertz phenomena occurring in natural and man-made things—small molecules rotate at THz frequencies; gaseous plasmas oscillate at THz frequencies; highly-excited electrons in Rydberg atoms orbit at THz frequencies; electrons in semiconductors and their nanostructures resonate at THz frequencies; biomolecules such as DNA and proteins vibrate at THz frequencies.

These applications provide strong motivation to advance the state of the art in THz source development. In particular, high-energy THz generation is vital for application in nonlinear THz optics and spectroscopy. Currently, intense THz radiation pulses exceeding tens of micro-Joules can be obtained from large accelerator facilities such as linear accelerators, synchrotrons, and free electron lasers. However, due to the large cost of building and operating those facilities and limited access, there is a present and growing demand for high-energy, compact THz sources at a tabletop scale.

One potential approach is using tabletop ultrafast lasers to produce coherent light ranging from X-rays to THz via novel frequency up/down conversion techniques. There are many tabletop methods for generating intense THz radiation, but THz generation in solids is fundamentally limited by material damage, which is a main obstacle for effective THz energy scaling. For example, to avoid THz saturation and material damage, extremely large samples (tens of centimeters to meters) of THz-producing materials are needed to take full advantage of modern tabletop lasers capable of providing multi-terawatt (1012 W) up to petawatt (1015 W) powers. Given this situation, plasma is an ideal choice for scalable THz generation because it is already broken down, and there is no concern about material damage.

We have studied intense coherent THz generation in plasmas, especially the generation mechanism of THz pulses in two-color laser mixing [1-10]. In this scheme, an ultrafast pulsed laser's fundamental and second harmonic fields are mixed in a gas of atoms or molecules, causing them to ionize. Microscopically, the laser fields act to suppress the atom's or molecule's Coulomb potential barrier, and, via rapid tunneling ionization, bound electrons are freed. The electrons, once liberated, oscillate at the laser frequencies, and also drift away from their parent ions at velocities determined by the laser field amplitudes and the relative phase between the two laser fields (see Fig. 2). Depending on the relative phase, symmetry can be broken to produce a net directional electron current. As this current occurs on the timescale of photoionization, for sub-picosecond lasers, it can generate electromagnetic radiation at THz frequencies.

THz generation via two-color photoionization in a gas by mixing the fundamental and second harmonic of ultrafast laser pulses. (a) Combined two-color laser field (solid line) and the trajectories of electrons (dotted lines) liberated at four different phases. (b) THz beam profile imaged by a two-dimensional electro-optic technique. (c) Computed radiation spectra of anti-correlated THz and third harmonic with two different relative phases.

This THz generation mechanism turns out to be closely related to the mechanism used to explain high harmonic generation (HHG) in gases, as both processes originate from a common source, that is, a nonlinear electron current. The electrons re-colliding with the parent ions are responsible for HHG, whereas the electrons drifting away from the ions without experiencing re-scattering ions account for THz generation.
more at:

[segorov]

The sixth international workshop on Optical Terahertz Science and Technology (OTST 2015) will be held in San Diego, California, USA from March 8th - 13th

Optical Terahertz Science and Technology (OTST) 2015
Sunday March 8 to Friday May 13
Program Overview
Sunday March 8th
11:00AM – 5:00PM Registration and Sign-In
2:00PM – 5:00PM Tutorial Session
2:00 – 2:36 Charles Schmuttenmaer, Yale University
“THz Studies of Carrier Dynamics in Nanomaterials”
 2:36 – 3:12 Tadao Nagatsuma, Osaka University
“Terahertz Wireless Communications”
3:12 – 3:48 Tobias Kampfrath, Fritz-Haber-Institute
“Material control with intense terahertz pulses”
3:48 – 4:24 Andrea Markelz, University at Buffalo
“THz spectroscopy of biomolecular dynamics”
 4:24 – 5:00 Alessandro Tredicucci, University of Pisa
“Graphene-based terahertz devices”
5:30PM – 7:00PM Reception
Note: the program overview (pages 1- 4) shows the session titles and invited speakers. The
complete speaker agenda is presented on pages 5 -8 and the complete poster agenda is
presented on pages 9-14.
Monday March 9th
Session 1:
8:30 AM -10:00AM: Session 1, Part 1: THz Photons
Miriam Vitiello
“Photonic engineering of THz quantum cascade resonators”
10:00 – 10:30AM Coffee break
10:30 – 12:15PM: Session 1, Part 2: Near Field and Far Field Spectroscopy
Rainer Hillenbrand
“Infrared nanoscopy and nanospectroscopy – From plasmons to proteins”OTST 2015 Program Overview
2
Lunch: 12:20 – 1:30PM
Poster Session 1: 1:45 – 3:15PM
Generation, Near-Field, Spectroscopy and Applications
Session 2:
3:30 – 5:00PM talks: Session 2, Part 1: Superconductors and Complex Materials
Martin Dressel, Uwe S. Pracht, Marc Scheffler, Boris Gorshunov, Daniel Sherman,
Aviad Frydman, Konstantin Ilin and Michael Siegel
“THz Spectroscopy of Superconducting Ultrathin Films”
5:00 – 5:30PM Coffee break
5:30 – 7:00PM talks: Session 2, Part 2: Nonlinear and Dynamic Phenomena in
 Complex Materials
Koichiro Tanaka
“Nonlinear optical phenomena induced by femtosecond pulse excitation in
topological insulators”
Tuesday March 10th
Session 3:
8:30 AM -10:00AM: Session 3, Part 1: Semiconductors and THz Generation
Renbao Liu
“High-order THz sideband generation in two-dimensional semiconductors”
10:00 – 10:30AM Coffee break
10:30 – 12:15PM: Session 3, Part 2: Metamaterials
Kuniaki Konishi, Makoto Kuwata-Gonokami
“Terahertz polarization control with symmetry-controlled materials and
metamaterials”
Lunch: 12:20 – 1:30PM
Poster Session 2: 1:45 – 3:15PM
Graphene, Generation, Plasmonics, & MetamaterialsOTST 2015 Program Overview
3
Session 4:
3:30 – 5:00PM: Session 4, Part 1: Plasmonics, Metamaterials
Mona Jarrahi
“Plasmonics Enabled High Power Terahertz Sources”
5:00 – 5:30PM Coffee break
5:30 – 7:00PM: Session 4, Part 2: Terahertz Near-Field
Tyler Cocker, Max Eisele, Markus Huber, Markus Plankl, Leonardo Viti, Daniel
Ercolani, Lucia Sorba, Miriam Vitiello and Rupert Huber
“Pump-probe multi-terahertz nano-spectroscopy with sub-cycle temporal
resolution”
Wednesday March 11th
Session 5:
8:30 AM -10:00AM: Session 5, Part 1: Carrier Dynamics in Materials and Devices
Liang Wu
“Low energy electrodynamics of topological insulator thin films”
10:00 – 10:30AM Coffee break
10:30 – 12:15PM: Session 5, Part 2: THz Generation and Quantum Cascade Lasers
Kodo Kawase, Kosuke Murate, Shin'Ichiro Hayashi and Saroj R. Tripathi
“Terahertz wave parametric amplifier”
Lunch: 12:20 – 1:30PM
Poster Session 3: 1:45 – 3:15PM
Carrier Dynamics, Metals, Complex Materials, Devices, Spectroscopy
Session 6:
3:30 – 5:00PM: Session 6, Part 1: Dynamics in Superconductors and Complex
Materials
Ryo Shimano
“Higgs mode in superconductors”
5:00 – 5:30PM Coffee breakOTST 2015 Program Overview
4
5:30 – 7:00PM: Session 6, Part 2: Waveguides and Field Emission
Robert McKinney, Yasuaki Monnai, Nicholas Karl, Rajind Mendis and Daniel
Mittleman
“Frequency-domain multiplexing in the terahertz range using a leaky
waveguide”
Thursday March 12th
Session 7:
8:30 AM -10:00AM: Session 7, Part 1: THz - from Semiconductors to the Cosmos
Mackillo Kira
“Expanding the scope of terahertz spectroscopy”
Matthias Hohenleutner, Fabian Langer, Olaf Schubert, Sebastian Baierl, Benedikt
Urbanek, Christoph Lange and Rupert Huber
“Multi-THz high-harmonic generation by dynamical Bloch oscillations in bulk
solids”
10:00 – 10:30AM Coffee break
10:30 – 12:00PM: Session 7, Part 2: THz - from Semiconductors to the Cosmos
Alfred Leitenstorfer, Claudius Riek, Denis V. Seletskiy
“The Dawn of (Multi-)Terahertz Quantum Optics”
Brian Keating
“Exploring the Terahertz and mm-wave Cosmos”
Lunch: boxed lunch to go
Excursions: 12:00PM – 5:00PM
Banquet Dinner – All Participants: 6:00PM -8:30PM
Friday March 13th
Session 8:
9:00 AM -10:30AM: Conference Summary and Announcements

OTST2015 Invited Speakers
Peter Armitage, Johns Hopkins University
Tyler Cocker, University of Regensburg
Martin Dressel, University of Stuttgart
Rainer Hillenbrand, CIC NanoGUNE
Rupert Huber, University of Regensburg
Mona Jarrahi, UCLA
Alfred Leitenstorfer, University of Konstanz
Kodo Kawase, Nagoya University
Brian Keating, UCSD
Mackillo Kira, University of Marburg
Makoto Kuwata-Gonokami, University of Tokyo
Renbao Liu, Chinese University of Hong Kong
Daniel Mittleman, Rice University
Ryo Shiimano, University of Tokyo
Koichiro Tanaka, Kyoto University
Miriam Vitiello, NEST, CNR Nanoscience Institute and Scuola Normale Superiore

 

[delmarphotonics]

Featured research - terahertz accelerators

Physicists Shrink Particle Accelerator

Prototype demonstrates feasibility of building terahertz accelerators

An interdisciplinary team of researchers has built the first prototype of a miniature particle accelerator that uses terahertz radiation instead of radio frequency structures. A single accelerator module is no more than 1.5 centimetres long and one millimetre thick. The terahertz technology holds the promise of miniaturising the entire set-up by at least a factor of 100, as the scientists surrounding DESY’s Franz Kärtner from the Center for Free-Electron Laser Science (CFEL) point out. They are presenting their prototype, that was set up in Kärtner's lab at the Massachusetts Institute of Technology (MIT) in the U.S., in the journal Nature Communications. The authors see numerous applications for terahertz accelerators, in materials science, medicine and particle physics, as well as in building X-ray lasers. CFEL is a cooperation between DESY, the University of Hamburg and the Max Planck Society.

In the electromagnetic spectrum, terahertz radiation lies between infrared radiation and microwaves. Particle accelerators usually rely on electromagnetic radiation from the radio frequency range; DESY’s particle accelerator PETRA III, for example, uses a frequency of around 500 megahertz. The wavelength of the terahertz radiation used in this experiment is around one thousand times shorter. “The advantage is that everything else can be a thousand times smaller too, ” explains Kärtner, who is also a professor at the University of Hamburg and at MIT, as well as being a member of the Hamburg Centre for Ultrafast Imaging (CUI), one of Germany’s Clusters of Excellence.

For their prototype the scientists used a special microstructured accelerator module, specifically tailored to be used with terahertz radiation. The physicists fired fast electrons into the miniature accelerator module using a type of electron gun provided by the group of CFEL Professor Dwayne Miller, Director at the Max Planck Institute for the Structure and Dynamics of Matter and also a member of CUI. The electrons were then further accelerated by the terahertz radiation fed into the module. This first prototype of a terahertz accelerator was able to increase the energy of the particles by seven kiloelectronvolts (keV).

“This is not a particularly large acceleration, but the experiment demonstrates that the principle does work in practice, ” explains co-author Arya Fallahi of CFEL, who did the theoretical calculations. “The theory indicates that we should be able to achieve an accelerating gradient of up to one gigavolt per metre.” This is more than ten times what can be achieved with the best conventional accelerator modules available today. Plasma accelerator technology, which is also at an experimental stage right now, promises to produce even higher accelerations, however it also requires significantly more powerful lasers than those needed for terahertz accelerators.

The physicists underline that terahertz technology is of great interest both with regard to future linear accelerators for use in particle physics, and as a means of building compact X-ray lasers and electron sources for use in materials research, as well as medical applications using X-rays and electron radiation. “The rapid advances we are seeing in terahertz generation with optical methods will enable the future development of terahertz accelerators for these applications, ” says first author Emilio Nanni of MIT. Over the coming years, the CFEL team in Hamburg plans to build a compact, experimental free-electron X-ray laser (XFEL) on a laboratory scale using terahertz technology. This project is supported by a Synergy Grant of the European Research Council.

So-called free-electron lasers (FELs) generate flashes of laser light by sending high-speed electrons from a particle accelerator down an undulating path, whereby these emit light every time they are deflected. This is the same principle that will be used by the X-ray laser European XFEL, which is currently being built by an international consortium, reaching from the DESY Campus in Hamburg to the neighbouring town of Schenefeld, in Schleswig-Holstein. The entire facility will be more than three kilometres long and will be the best and most modern of its kind after completion.

The experimental XFEL using terahertz technology is expected to be less than a metre long. “We expect this sort of device to produce much shorter X-ray pulses lasting less than a femtosecond”, says Kärtner. Because the pulses are so short, they reach a comparable peak brightness to those produced by larger facilities, even if there is significant less light in each pulse. “With these very short pulses we are hoping to gain new insights into extremely rapid chemical processes, such as those involved in photosynthesis.”

Developing a detailed understanding of photosynthesis would open up the possibility of implementing this efficient process artificially and thus tapping into increasingly efficient solar energy conversion and new pathways for CO2 reduction. Beyond this, researchers are interested in numerous other chemical reactions. As Kärtner points out, “photosynthesis is just one example of many possible catalytic processes we would like to investigate.” The compact XFEL can be potentially also used to seed pulses in large scale facilities to enhance the quality of their pulses. Also, certain medical imaging techniques could benefit from the enhanced characteristics of the novel X-ray source.

SOURCE: DESY

[delmarphotonics]

THz magneto-photoresponse spectroscopy of HgTe based quantum well (gapped Dirac type electronic dispersion)
Mehdi Pakmehr, Christoph Bruene, Laurens W. Molenkamp, Bruce D. McCombe
23 April 2015 • 3:00 - 3:20 PM | Part of SPIE Sensing Technology + Applications

Diffractive optics technologies in infrared systems
Yakov G. Soskind
22 April 2015 • 11:10 - 11:40 AM | Part of SPIE Defense + Security

Enhancement of THz signal intensity by plasmonic monopole nanoantenna
Ekmel Ozbay
22 April 2015 • 8:30 - 9:00 AM | Part of SPIE Sensing Technology + Applications

Terahertz electronics for sensing and imaging applications
Michael Shur
24 April 2015 • 10:20 - 10:40 AM | Part of SPIE Defense + Security

A compact THz imaging set-up at 750 microns
Linda E. Marchese, Marc Terroux, Alain Bergeron
24 April 2015 • 10:40 - 11:00 AM | Part of SPIE Defense + Security

Feasibility of radon imaging reconstruction in the MMW region using very inexpensive plasma GDD lamps with new video rate 16x16 FPA camera
Assaf Levanon III, Michael Konstantinovsky II, itzhak itzhaky, Adrian Stern, Natan S. Kopeika, Amir Abramovich
23 April 2015 • 4:50 - 5:10 PM | Part of SPIE Defense + Security

GaN-based terahertz quantum cascade lasers
Wataru Terashima, Hideki Hirayama
22 April 2015 • 9:00 - 9:30 AM | Part of SPIE Sensing Technology + Applications

Nanoplasmonic and metamaterials concepts for broadband surface enhanced sensing
Tyler R. Roschuk, Stefan A. Maier
21 April 2015 • 2:40 - 3:00 PM | Part of SPIE Defense + Security

Terahertz isolator based on nonreciprocal magneto-metasurface
Sai Chen, Fei Fan, Pengfei Wu, Bo Liu, Shengjiang Chang
22 April 2015 • 8:00 - 8:30 AM | Part of SPIE Sensing Technology + Applications

Ultrafast fiber lasers: practical applications
Igor Pastirk, Alexander Sell, Robert Herda, Andreas Brodschelm, Armin Zach
24 April 2015 • 9:10 - 9:30 AM | Part of SPIE Defense + Security

Study on gas molecule adsorption-desorption dynamics on graphene using terahertz emission spectroscopy
Iwao Kawayama, Saikat Talapatra, Robert Vajtai, Pulickel M. Ajayan, Junichiro Kono, Tonouchi Masayoshi
22 April 2015 • 9:30 - 10:00 AM | Part of SPIE Sensing Technology + Applications

Laminated materials characterization by terahertz kinetics spectroscopy
Anis Rahman, Aunik K. Rahman
23 April 2015 • 2:00 - 2:20 PM | Part of SPIE Sensing Technology + Applications

Millimeter-wave imaging at up to 40 frames per second using an optoelectronic photo-injected Fresnel zone plate lens antenna at (sub-) mmw frequencies
Thomas F. Gallacher, David G. Macfarlane, Rune Sondena, Duncan A. Robertson, Graham M. Smith
23 April 2015 • 10:30 - 10:50 AM | Part of SPIE Defense + Security

Solid state THz sources with higher power
Thomas W. Crowe, Steven A. Retzloff, Jeffrey L. Hesler
23 April 2015 • 11:40 AM - 12:10 PM | Part of SPIE Sensing Technology + Applications

Nonlinear optical frequency up-conversion broadening terahertz horizons in sensitive detection
Kouji Nawata, Shin'ichiro Hayashi, Hiroaki Minamide
23 April 2015 • 1:30 - 2:00 PM | Part of SPIE Sensing Technology + Applications

Efficiency of using the spectral dynamics analysis for pulsed THz spectroscopy of both explosive and other materials
Vyacheslav A. Trofimov, Svetlana A. Varentsova
20 April 2015 • 11:40 AM - 12:00 PM | Part of SPIE Defense + Security

Performances of THz cameras with enhanced sensitivity in sub-terahertz region
Naoki Oda, Tsutomu Ishi, Seiji Kurashina, Takayuki Sudou, Takao Morimoto, Masaru Miyoshi, Kohei Doi, Hideki Goto, Tokuhito Sasaki, Goro Isoyama, Ryukou Kato, Akinori Irizawa, Keigo Kawase
23 April 2015 • 4:20 - 4:40 PM | Part of SPIE Sensing Technology + Applications

Applications and challenges for MMW and THz sensors
John N. Sanders-Reed
24 April 2015 • 11:40 AM - 12:00 PM | Part of SPIE Defense + Security

Experimental determination of terahertz atmospheric absorption parameters
David M. Slocum, Thomas M. Goyette, Robert H. Giles, William E. Nixon
23 April 2015 • 2:20 - 2:40 PM | Part of SPIE Sensing Technology + Applications

Possibility of the detection and identification of substance at long distance using the noisy reflected THz pulse under real conditions
Vyacheslav A. Trofimov, Svetlana A. Varentsova, Vladislav V. Trofimov
23 April 2015 • 2:40 - 3:00 PM | Part of SPIE Sensing Technology + Applications

Terahertz science and technology of carbon nanomaterials
Junichiro Kono
22 April 2015 • 12:00 - 12:30 PM | Part of SPIE Defense + Security

THz-wave parametric amplifier using LiNbO3 crystal
Kodo Kawase, Kosuke Murate, Kazuki Imayama, Shin'ichiro Hayashi
22 April 2015 • 2:00 - 2:30 PM | Part of SPIE Sensing Technology + Applications

Compact THz receivers
Thomas W. Crowe, Eric W. Bryerton, Jeffrey L. Hesler
22 April 2015 • 3:30 - 4:00 PM | Part of SPIE Sensing Technology + Applications

Anomalous reflection of THz pulse containing a few cycles from absorbing layer: influence of absolute phase of the pulse on the medium response
Vyacheslav A. Trofimov, Mikhail V. Fedotova, Elena S. Komarova
23 April 2015 • 11:40 AM - 12:00 PM | Part of SPIE Defense + Security

Dark field THz camera imaging measurements, 200 GHz to 400 GHz
Andrew P. Sacco, J D. Newman, Paul P. K. Lee, Kenneth D. Fourspring, John H. Osborn, Robert D. Fiete, Mark F. Bocko, Zeljko Ignjatovic, Judith L. Pipher, Craig W. McMurtry, Xi-Cheng Zhang, Jagannath Dayalu, Katherine Seery, Chao X. Zhang, Zoran Ninkov
23 April 2015 • 5:20 - 5:40 PM | Part of SPIE Sensing Technology + Applications

Phase characteristics of subwavelength antenna elements for efficient design of terahertz frequency and millimeter-wavelength metasurfaces
Richard J. Williams, Andrew J. Gatesman, William E. Nixon
23 April 2015 • 9:20 - 9:40 AM | Part of SPIE Sensing Technology + Applications

Tuning of terahertz metamaterials' resonances via near field coupling
Abul K. Azad
23 April 2015 • 8:50 - 9:20 AM | Part of SPIE Sensing Technology + Applications

Terahertz reflection interferometry for automobile paint layer thickness measurement
Aunik K. Rahman, Kenneth B. Tator, Anis Rahman
21 April 2015 • 9:20 - 9:40 AM | Part of SPIE Sensing Technology + Applications

Quantum cascade laser frequency combs for spectroscopy
Jerome Faist
24 April 2015 • 3:30 - 4:00 PM | Part of SPIE Defense + Security
UPCOMING CONFERENCE
Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense
22-23 Apr 2015 | Part of SPIE Sensing Technology + Applications

Observation of temperature trace, induced by changing of temperature inside the human body, on the human body skin using commercially available IR camera
Vyacheslav A. Trofimov, Vladislav V. Trofimov
23 April 2015 • 3:30 - 3:50 PM | Part of SPIE Sensing Technology + Applications

Metal-organic hybrid metamaterial THz imaging detectors etching, dramitically increasing the speed and lowering the cost of production of such FPAs
Dragoslav Grbovic, Fabio Alves, Gamani Karunasiri
22 April 2015 • 8:00 - 8:30 AM | Part of SPIE Defense + Security

Video rate imaging at 1.5 THz via frequency upconversion to the near-IR
Patrick F. Tekavec, Vladimir G. Kozlov, Ian McNee, Yun-Shik Lee, Konstantin L. Vodopyanov
24 April 2015 • 12:00 - 12:20 PM | Part of SPIE Defense + Security

Terahertz oscillators and receivers using electron devices for high-capacity wireless communication
Safumi Suzuki, Masahiro Asada
22 April 2015 • 2:30 - 3:00 PM | Part of SPIE Sensing Technology + Applications

Characteristics and performance of a commercial multiband passive submillimetre-wave video camera
Arttu R. Luukanen, Juha Ala-Laurinaho, Alex Kokka, Mikko M. Leivo, Aleksi A. Tamminen, Antti V. Raisanen
23 April 2015 • 10:50 - 11:10 AM | Part of SPIE Defense + Security

Electromagnetic scattering from metallic and dielectric surfaces at millimeter-wave and terahertz frequencies
David A. DiGiovanni, Andrew J. Gatesman, Robert H. Giles, Williams E. Nixon
23 April 2015 • 3:50 - 4:10 PM | Part of SPIE Defense + Security

Optical simulation of terahertz antenna using finite difference time domain method
Chao Zhang, Zoran Ninkov, Gregory Fertig, Andrew Sacco, Daniel Newman, Kenneth Fourspring, Zeljko Ignjatovic, Paul Lee, Judy Pipher, Craig McMurtry, Jagannath Dayalu
22 April 2015 • 4:50 - 5:10 PM | Part of SPIE Sensing Technology + Applications

Robust identification of concealed dangerous substances using THz imaging spectroscopy
Arthur D. van Rheenen, Magnus W. Haakestad, Helle E. Nystad
23 April 2015 • 5:00 - 5:20 PM | Part of SPIE Sensing Technology + Applications

Terahertz-wave detector modules implementing zero-biased InGaAsP Schottky-barrier diodes
Hiroshi Ito
22 April 2015 • 1:30 - 2:00 PM | Part of SPIE Sensing Technology + Applications

Extreme THz nonlinearities: high-harmonic generation, dynamical Bloch oscillations and interband Zener tunneling in bulk semiconductors
Christoph Lange, Olaf Schubert, Matthias Hohenleutner, Fabian Langer, Benedikt Urbanek, Ulrich Huttner, Daniel Golde, Torsten Meier, Mackillo Kira, Stephan W. Koch, Rupert Huber
23 April 2015 • 10:40 - 11:10 AM | Part of SPIE Sensing Technology + Applications

High power MWIR quantum cascade lasers and their use in intra-cavity THz room temperature generation
Mariano Troccoli
24 April 2015 • 12:20 - 12:40 PM | Part of SPIE Defense + Security

MCT as sub-terahertz and infrared detector
Fiodor F. Sizov, Vyacheslav V. Zabudsky, Sergey A. Dvoretskii, Vladimir A. Petryakov, Aleksandr G. Golenkov, Katerina V. Andreyeva, Zinoviia F. Tsybrii, Anna V. Shevchik-Shekera, Ernesto Dieguez
23 April 2015 • 4:40 - 5:00 PM | Part of SPIE Sensing Technology + Applications

Metasurface induced terahertz transparency and absorption
Weili Zhang
23 April 2015 • 8:00 - 8:30 AM | Part of SPIE Sensing Technology + Applications

THz devices based on 2D electron systems
Huili G. Xing
22 April 2015 • 8:30 - 9:00 AM | Part of SPIE Defense + Security

Terahertz metamaterials for modulation and detection
Sameer Sonkusale, Pramod Singh, Saroj Rout, Guoqing Fu, Wangren Xu
22 April 2015 • 1:00 - 1:30 PM | Part of SPIE Sensing Technology + Applications

Toward low-loss, infrared and THz nanophotonics and metamaterials: surface photon polariton modes in polar dielectric crystals
Joshua D. Caldwell
22 April 2015 • 11:30 AM - 12:00 PM | Part of SPIE Defense + Security

Inspection of mechanical and electrical properties of silicon wafers using terahertz tomography and spectroscopy
Thomas Arnold, Wolfgang Muhleisen, Johannes Schicker, Christina Hirschl, Raimund Leitner
23 April 2015 • 6:00 - 7:30 PM | Part of SPIE Sensing Technology + Applications

Graphene active plasmionics for terahertz device applications
Taiichi T. Otsuji
22 April 2015 • 9:00 - 9:30 AM | Part of SPIE Defense + Security

Room temperature terahertz detectors and their applications
Jian Chen, Xuecou Tu, Lin Kang, Biaobing Jin, Peiheng Wu
23 April 2015 • 3:50 - 4:20 PM | Part of SPIE Sensing Technology + Applications

Toward the development of an image quality tool for the testing of active millimeter-wave imaging systems
Jeffrey Barber, James C. Weatherall, Joseph Greca, Barry T. Smith
23 April 2015 • 2:00 - 2:20 PM | Part of SPIE Defense + Security

Some opinion about matrix terahertz imaging system based on Josephson junctions
A. Denisov, Jing Hui Qiu, Shengchang Lan, Alexander Gudkov
23 April 2015 • 1:20 - 1:40 PM | Part of SPIE Defense + Security

Terahertz nonlinear optics of graphene and 3D topological insulators
Alexey A. Belyanin, Xianghan Yao, Mikhail D. Tokman
22 April 2015 • 9:30 - 10:00 AM | Part of SPIE Defense + Security

[delmarphotonics]

UPCOMING CONFERENCE
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII
10-12 Feb 2015 | Part of SPIE OPTO

Higgs amplitude mode in s-wave superconductors revealed by terahertz pump-terahertz probe spectroscopy
Ryusuke Matsunaga, Ryo Shimano
10 February 2015 • 4:00 - 4:30 PM | Part of SPIE OPTO

Investigating the coherence properties of terahertz quantum cascade lasers with fs-laser combs
Stefano Barbieri
10 February 2015 • 11:30 - 11:50 AM | Part of SPIE OPTO

Terahertz field acceleration, angular tuning, and kinetic energy tailoring of ultrashort electron pulses
Shawn R. Greig, Abdulhakem Y. Elezzabi
9 February 2015 • 4:35 - 4:50 PM | Part of SPIE OPTO

Recent advances in the research toward graphene-based terahertz lasers
Taiichi Otsuji, Akira Satou, Takayuki Watanabe, Stephane A. Boubanga Tombet, Alexander A. Dubinov, Vyacheslav V. Popov, Vladimir Mitin, Michael Shur, Victor Ryzhii
11 February 2015 • 4:50 - 5:20 PM | Part of SPIE OPTO

Plasmonic terahertz optoelectronics
Mona Jarrahi
8 February 2015 • 8:30 - 9:00 AM | Part of SPIE OPTO

Optically-pumped continuous-wave terahertz sources
Philipp Latzel, Fabio Pavanello, Emilien Peytavit, Mohammed Zaknoune, Guillaume Ducournau, Xavier Wallart, Jean-Francois Lampin
8 February 2015 • 11:00 - 11:20 AM | Part of SPIE OPTO

Waveform-over-fiber: DSP-aided coherent fiber-wireless transmission by millimeter and terahertz waves
Atsushi Kanno, Pham Tien Dat, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Ken'ichi Kitayama
11 February 2015 • 11:40 AM - 12:10 PM | Part of SPIE OPTO

Terahertz octave-spanning semiconductor laser for comb applications
Giacomo Scalari, Markus Roesch, Mattias Beck, Jerome Faist
11 February 2015 • 8:10 - 8:40 AM | Part of SPIE OPTO

A compact fiber-coupled terahertz sensor system for industrial automation applications
Alireza Zandieh, Daniel M. Hailu, Mohamed Missous, Daryoosh Saeedkia
10 February 2015 • 4:20 - 4:40 PM | Part of SPIE OPTO

Demonstration of high-resolution doping profile mapping using terahertz time domain spectroscopy with electrochemical anodization
Chih-Yu Jen, Gaurav Tulsyan, Christiaan Richter
11 February 2015 • 4:10 - 4:30 PM | Part of SPIE OPTO

Emitting terahertz frequency wave by charged fullerene C36 inside carbon nanotube under electric field
Olga E. Glukhova, Anna S. Kolesnikova, Mikhail M. Slepchenkov
8 February 2015 • 5:30 - 7:00 PM | Part of SPIE BiOS

Hydration kinetics of cement composites with varying water-cement ratio using terahertz spectroscopy
Shaumik Ray, Kathirvel Nallappan, Jyotirmayee Dash, Saptarshi Sasmal, Bala Pesala
12 February 2015 • 11:10 - 11:30 AM | Part of SPIE OPTO

Mid-IR and terahertz digital holography based on quantum cascade lasers
Marco Ravaro, Massimiliano Locatelli, Eugenio Pugliese, Mario Siciliani de Cumis, Francesco D'Amato, Luigi Consolino, Saverio Bartalini, Miriam S. Vitiello, Paolo De Natale
10 February 2015 • 11:00 - 11:15 AM | Part of SPIE OPTO

Flexible waveguide-enabled single-channel terahertz endoscopic system
Pallavi Doradla, Karim Alavi, Cecil S. Joseph, Robert H. Giles
11 February 2015 • 8:50 - 9:10 AM | Part of SPIE OPTO

Development of portable terahertz scanner for imaging and spectroscopy using InP-related devices
Kyung Hyun Park
12 February 2015 • 8:30 - 9:00 AM | Part of SPIE OPTO

Pulse shaping of the intense few-cycle terahertz pulses for nonlinear spectroscopy
Masaya Nagai
8 February 2015 • 10:45 - 11:15 AM | Part of SPIE OPTO

Large loop antenna to enhance impedance matching characteristics for a terahertz photomixer
Han-Cheol Ryu, Eui Su Lee, Kyung Hyun Park
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Terahertz plasmonic channel waveguide based on metallic rod arrays
Borwen You, Wen-Jie Cheng, Ja-Yu Lu
10 February 2015 • 5:00 - 5:20 PM | Part of SPIE OPTO

Yb-doped short pulse fiber laser for terahertz radiation
Moon Sik Kong, Min Hee Kim, Yong Seok Kwon, Sang-Pil Han, Namje Kim, Kyung Hyun Park, Han-Cheol Ryu, Min Yong Jeon
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Terahertz wave modulators using organic/inorganic hybrid structures
Joong-Wook Lee
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Effects of different terahertz frequencies on gene expression in human keratinocytes
Ibtissam Echchgadda, Cesario Z. Cerna, Mark A. Sloan, David P. Elam, Bennet L. Ibey
10 February 2015 • 11:40 AM - 12:00 PM | Part of SPIE BiOS

Incoherent sub-terahertz radiation source with a photomixer array for active imaging in smoky environments
Naofumi Shimizu, Ken Matsuyama, Hidetake Uchida
10 February 2015 • 2:10 - 2:30 PM | Part of SPIE OPTO

Accurate simulation of terahertz transmission through doped silicon junctions
Chih-Yu Jen, Christiaan Richter
10 February 2015 • 5:30 - 5:45 PM | Part of SPIE OPTO

Intra-operative terahertz probe for detection of breast cancer
Alessia Portieri
10 February 2015 • 1:30 - 1:50 PM | Part of SPIE OPTO

Large-area gate-tunable terahertz plasmonic metasurfaces employing graphene anti-dot array structures
Peter Q. Liu, Federico Valmorra, Curdin Maissen, Giacomo Scalari, Jerome Faist
9 February 2015 • 2:00 - 2:20 PM | Part of SPIE OPTO

Terahertz photonic crystals based on two-dimensional rod array
Borwen You, Wen-Jie Cheng, Ja-Yu Lu
10 February 2015 • 5:20 - 5:40 PM | Part of SPIE OPTO

Terahertz wavefront assessment based on 2D electro-optic imaging
Harsono Cahyadi, Ryuji Ichikawa, Jerome Degert, Eric Freysz, Takeshi Yasui, Emmanuel Abraham
10 February 2015 • 4:40 - 5:00 PM | Part of SPIE OPTO

Sensitive detection of microorganisms using terahertz metamaterials and plasmonic devices
SaeJune Park, Yeong Hwan Ahn
11 February 2015 • 11:50 AM - 12:05 PM | Part of SPIE OPTO

High-power and broadband terahertz generation through large-area plasmonic photoconductive emitters
Nezih T. Yardimci
11 February 2015 • 12:05 - 12:20 PM | Part of SPIE OPTO

Compensating the carrier screening effect in plasmonic photoconductive terahertz sources
Shang Hua Yang, Nezih T. Yardimci, Mona Jarrahi
12 February 2015 • 10:50 - 11:10 AM | Part of SPIE OPTO

A new scheme for ultra-intense terahertz pulse production and nonlinear THz science
Christoph P. Hauri, Carlo Vicario
11 February 2015 • 9:10 - 9:30 AM | Part of SPIE OPTO

Multiple-angle approach for enhanced terahertz spectroscopic pattern recognition
Frank Ellrich, Daniel Molter, Soufiene Krimi, Joachim Jonuscheit, Georg von Freymann, Frank Platte, Christoph Fredebeul, Konstantinos Nalpantidis, Daniel Hubsch, Tobais Wurschmidt, Thorsten Sprenger
12 February 2015 • 9:00 - 9:20 AM | Part of SPIE OPTO

Probing the real-world via terahertz nano-devices
Miriam S. Vitiello
12 February 2015 • 8:00 - 8:30 AM | Part of SPIE OPTO

Time-resolved observation of excitonic dynamics under coherent terahertz excitation in GaAs quantum wells
Kento Uchida, Hideki Hirori, Takao Aoki, Christian Wolpert, Yu Mukai, Koichiro Tanaka, Toshimitsu Mochizuki, Changsu Kim, Masahiro Yoshita, Hidehumi Akiyama, Loren N. Pfeiffer, Kenneth W. West
10 February 2015 • 5:15 - 5:30 PM | Part of SPIE OPTO

Magnetic dipole and electric dipole resonances in TiO2 microspheres at terahertz frequencies
Oleg Mitrofanov, Filip Domenic, Petr Kuzel, John Reno, Igal Brener, Cathy Elissald, Seu Chung, Mario Maglione, Patrick Mounaix
8 February 2015 • 9:40 - 9:55 AM | Part of SPIE OPTO

Nonlinear magnetization dynamics in HoFeO3 induced by strong terahertz magnetic field
Yu Mukai, Hideki Hirori, Takafumi Yamamoto, Hiroshi Kageyama, Koichiro Tanaka
11 February 2015 • 9:30 - 9:45 AM | Part of SPIE OPTO

Thin-film sensing with phase delayed terahertz pulses
Tae-In Jeon, Hyeon Sang Bark, Jingshu Zha, Eui Su Lee
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Homogeneous anisotropic terahertz response by photo-designed sub-wavelength grating
Lorenzo L. Columbo, Francesco P. Mezzapesa, Massimo Brambilla, Maurizio Dabbicco, Miriam S. Vitiello, Carlo Rizza, Gaetano Scamarcio
10 February 2015 • 11:15 - 11:30 AM | Part of SPIE OPTO

Terahertz spectroscopy and detection of brain tumor in rat fresh-tissue samples
Sayuri Yamaguchi, Yasuko Fukushi, Oichi Kubota, Takeaki Itsuji, Seiji Yamamoto M.D., Toshihiko Ouchi
10 February 2015 • 11:00 - 11:20 AM | Part of SPIE BiOS

Terahertz monopole resonators using planar plasmonic metamaterials
Joong-Wook Lee
11 February 2015 • 11:05 - 11:35 AM | Part of SPIE OPTO

Nonlinear semiconducting metamaterials at terahertz frequencies
Richard D. Averitt
11 February 2015 • 10:35 - 11:05 AM | Part of SPIE OPTO

Terahertz harmonic generation in graphene
Samwel K. Sekwao, Jean-Pierre Leburton
10 February 2015 • 5:40 - 6:00 PM | Part of SPIE OPTO

Plasmonic photomixers for high-power continuous-wave terahertz generation
Christopher W. Berry, Mohammad R. Hashemi, Sascha Preu, Hong Lu, Arthur C. Gossard, Mona Jarrahi
11 February 2015 • 1:30 - 2:00 PM | Part of SPIE OPTO

3D terahertz metamaterials with asymmetric transmission
Aggelos Xomalis, George Kenanakis, Alexandros Selimis, Maria Vamvakaki, Maria Kafesaki, Maria Farsari
8 February 2015 • 2:30 - 2:50 PM | Part of SPIE LASE

Control of intra-excitonic scattering in semiconductor quantum wells by an external magnetic field
Harald Schneider, Jayeeta Bhattacharyya, Sabine Zybell, Faina Esser, Manfred Helm, Lukas Schneebeli, Christoph N. Bottge, Benjamin Breddermann, Mackillo Kira, Stephan W. Koch
10 February 2015 • 4:45 - 5:00 PM | Part of SPIE OPTO

THz generation by optical rectification in graphene at room temperature: beyond the linear carrier dispersion
Juliette Mangeney, Jean Maysonnave, Simon Huppert, Feihu Wang, Simon Maero, Claire Berger, Walter A. de Heer, Theodore B. Norris, Louis-Anne de Vaulchier, Sukhdeep S. Dhillon, Jerome Tignon, Robson Ferreira
8 February 2015 • 12:15 - 12:35 PM | Part of SPIE OPTO

Video rate imaging of narrow band THz radiation based on frequency upconversion
Patrick F. Tekavec, Vladimir G. Kozlov, Ian McNee, Igor E. Spektor, Sergey P. Lebedev
11 February 2015 • 11:10 - 11:30 AM | Part of SPIE OPTO

THz quantum cascade lasers based on hyperuniform disordered design
Riccardo Degl'Innocenti, Yash D. Shah, Luca Masini, Alberto Ronzani, Yuan Ren, David S. Jessop, Alessandro Tredicucci, Harvey E. Beere, David A. Ritchie
8 February 2015 • 11:40 AM - 12:00 PM | Part of SPIE OPTO

Enhancement of coherent acoustic phonons in InGaN nanocavities
Shopan D. Hafiz, Fan Zhang, Morteza Monavarian, Vitaliy Avrutin, Hadis Morkoc, Umit Ozgur
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Introduction of liquid crystal device into THz phase imaging
Ryota Ito, Takuya Takahashi, Michinori Honma, Toshiaki Nose
11 February 2015 • 11:50 AM - 12:10 PM | Part of SPIE OPTO

Coupled simulation of carrier transport and electrodynamics: the EMC/FDTD/MD technique
Irena Knezevic
9 February 2015 • 1:30 - 2:00 PM | Part of SPIE OPTO

Nanoscale precision in ion milling for THz and optical antennas
Gediminas Seniutinas, Gediminas Gervinskas, Saulius Juodkazis
9 February 2015 • 3:20 - 3:40 PM | Part of SPIE OPTO

Broadband transient THz conductivity of the transition-metal dichalcogenide MoS2
Jan H. Buss, Ryan P. Smith, Giacomo Coslovich, Robert A. Kaindl
10 February 2015 • 5:00 - 5:15 PM | Part of SPIE OPTO

Uni-travelling carrier photodetectors as THz detectors and emitters
Cyril C. Renaud, Martyn J. Fice, Lalitha Ponnampalam, Michele Natrella, Chris Graham, Alwyn J. Seeds
8 February 2015 • 12:00 - 12:15 PM | Part of SPIE OPTO

Intense THz radiation from laser plasma with controllable waveform and polarization
Peng Liu, Ya Bai, Liwei Song, Ruxin Li, Zhizhan Xu
11 February 2015 • 4:20 - 4:50 PM | Part of SPIE OPTO

Glasses and ceramics for THz photonics
S. K. Sundaram
10 February 2015 • 3:30 - 4:00 PM | Part of SPIE OPTO

Investigation of the effects of low- and high-power 2.52 THz radiation on human keratinocytes
Cesario Z. Cerna, David P. Elam, Mark A. Sloan, Ibtissam Echchgadda, Ibey L. Bennet
10 February 2015 • 11:20 - 11:40 AM | Part of SPIE BiOS

Intense THz sources for condensed matter physics
Matthias C. Hoffmann
10 February 2015 • 2:20 - 2:50 PM | Part of SPIE LASE

Recent progress and future prospects of THz quantum-cascade lasers
Hideki Hirayama, Wataru Terashima, Tsung-Tse Lin, Miho Sasaki
11 February 2015 • 3:50 - 4:20 PM | Part of SPIE OPTO

Sub-cycle control of multi-THz high-harmonic generation and all-coherent charge transport in bulk semiconductors
Christoph Lange, Olaf Schubert, Matthias Hohenleutner, Fabian Langer, Thomas Maag, Sebastian Baierl, Ulrich Huttner, Daniel Golde, Thorsten Meier, Mackillo Kira, Stephan W. Koch, Rupert Huber
10 February 2015 • 1:50 - 2:20 PM | Part of SPIE LASE

Enhanced multiband photodetection in blocked impurity band detectors with antenna-coupled microcavities
Kaisheng Liao
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Liquid crystal THz photonics with indium tin oxide nanowhiskers and graphene as functional electrodes
Ci-Ling Pan
10 February 2015 • 4:00 - 4:30 PM | Part of SPIE OPTO

Opening new territory in THz using coherent synchrotron radiation
Pascale Roy
8 February 2015 • 11:20 - 11:40 AM | Part of SPIE OPTO

Fourier transform molecular rotational resonance spectroscopy for reprogrammable chemical sensing
Brent J. Harris, Robin L. Pulliam, Justin L. Neill, Matt T. Muckle, Roger Reynolds, Dave McDaniel, Brooks H. Pate
12 February 2015 • 2:10 - 2:30 PM | Part of SPIE OPTO

Enhancing the low frequency THz resonances (< 1 THz) of organic molecules via electronegative atom substitution
Jyotirmayee Dash, Shaumik Ray, Kathirvel Nallappan, Nitin Basutkar, Rajesh Gonnade, Ashootosh Ambade, Bala Pesala
11 February 2015 • 9:50 - 10:10 AM | Part of SPIE OPTO

PT symmetric metamaterials and polarisation phase transitions
Mark Lawrence, Ningning Xu, Xueqian Zhang, Longqing Cong, Jiaguang Han, Weili Zhang, Shuang Zhang
12 February 2015 • 10:15 - 10:30 AM | Part of SPIE OPTO

Deep sub-wavelength structure empowered THz components
Jinghua Teng
11 February 2015 • 10:40 - 11:10 AM | Part of SPIE OPTO

Design and characterization of evanescently-coupled dual-photodiodes for 1.3?m wavelength
Eui Su Lee, Won-Hui Lee, Namje Kim, Jeong-Woo Park, Sang-Pil Han, Kyung Hyun Park
12 February 2015 • 2:30 - 2:50 PM | Part of SPIE OPTO

Prospects for millimetre-wave-over-fibre and THz-over-fibre systems
Alwyn J. Seeds, Haymen Shams, Martyn Fice, Katarzyna Balakier, Lalitha Ponnampalam, Cyril Renaud
10 February 2015 • 8:50 - 9:20 AM | Part of SPIE OPTO

Frequency tuning of THz quantum cascade lasers
Andriy Danylov, Alexander R. Light, Jerry Waldman, Neal Erickson, Xifeng Qian
12 February 2015 • 8:00 - 8:30 AM | Part of SPIE OPTO

Nonlinear optics with quantum-engineered intersubband metamaterials
Jongwon Lee, Nishant Nookala, Mykhailo Tymchenko, Seunyong Jung, Frederic Demmerle, Gerhard Boehm, Markus-Christian Amann, Andrea Alu, Mikhail A. Belkin
11 February 2015 • 2:50 - 3:20 PM | Part of SPIE OPTO

Optical vortices pioneer chiral nano-structures
Takashige Omatsu
9 February 2015 • 1:40 - 2:10 PM | Part of SPIE LASE

Precision frequency metrology with microresonator combs
Scott Diddams, Scott B. Papp
9 February 2015 • 2:10 - 2:35 PM | Part of SPIE LASE
COURSE AT CONFERENCE
Semiconductor Photonic Device Fundamentals (SC747)
Instructor(s): Linden, Kurt J., N2 Biomedical
Level: Introductory • 0.65 CEU • Length: 9.00 hours
Member Price: 525.00 | Non-Member Price: 635.00
8 February 2015 • 8:30 AM | Part of SPIE Photonics West

Dual-comb MIXSEL
Sandro M. Link, Christian A. Zaugg, Alexander Klenner, Mario Mangold, Matthias Golling, Bauke W. Tilma, Ursula Keller
10 February 2015 • 11:40 AM - 12:00 PM | Part of SPIE LASE

High efficiency, wide bandwidth THz generation in organic crystals OH1 and DSTMS
Carolina C. Medrano, Tobias Bach, Mojca Jazbinsek, Peter Gunter
10 February 2015 • 3:10 - 3:30 PM | Part of SPIE LASE

Preliminary results of non-contact THz imaging of cornea
Shijun Sung, James Garritano, Neha Bajwa, Sophie Deng, Jean-Pierre Hubschman, Warren S. Grundfest M.D., Zachary D. Taylor
11 February 2015 • 8:20 - 8:50 AM | Part of SPIE OPTO

THz components and devices
Elliott R. Brown
10 February 2015 • 2:30 - 3:00 PM | Part of SPIE OPTO

Towards graphene photonics and plasmonics
Shin Mou, Don Abeysinghe, Joshua Myers, Justin W. Cleary, Nima Nader, Joshua R. Hendrickson
11 February 2015 • 6:00 - 8:00 PM | Part of SPIE OPTO

Monolithic optical frequency comb based on quantum dashed mode locked lasers for Tb/s data transmission
Anthony Martinez, Cosimo Calo, V. Panapakkam, Kamel Merghem, Regan T. Watts, Vidak Vujicic, Colm Browning, Alain Accard, Francois Lelarge, Liam P. Barry, Abderrahim Ramdane
12 February 2015 • 11:50 AM - 12:10 PM | Part of SPIE OPTO

Photoconductive materials for THz generation at 1550 nm: ErAs:GaAs- vs InGaAs-based materials
Matthieu Martin, Elliott R. Brown
10 February 2015 • 4:00 - 4:20 PM | Part of SPIE OPTO

Complex dielectric properties of anhydrous glucose with THz time-domain spectroscopy
Ping Sun, Wei Liu, Yun Zou, Qiongzhen Jia, Jiayu Li
9 February 2015 • 5:30 - 7:30 PM | Part of SPIE BiOS

Simultaneous excitation of the magnetic and electronic systems in a ferromagnetic cobalt by ultra intense?3 THz bullet
Mostafa Shalaby, Carlo Vicario, Yan Luning, Christoph Hauri
11 February 2015 • 9:45 - 10:00 AM | Part of SPIE OPTO

Investigation of coupled optical parametric oscillators for novel applications
Yujie J. Ding
11 February 2015 • 3:50 - 4:20 PM | Part of SPIE OPTO

Quartz-enhanced photoacoustic sensors for H2S trace gas detection
Vincenzo Spagnolo, Pietro Patimisco, Angelo Sampaolo, Mario Siciliani de Cumis, Silvia Viciani, Simone Borri, Paolo De Natale, Francesco D'Amato, Miriam S. Vitiello, Gaetano Scamarcio
9 February 2015 • 2:40 - 2:55 PM | Part of SPIE OPTO

High-Q fully-switchable THz superconducting complementary metasurfaces
Giacomo Scalari, Sara Cibella, Curdin Maissen, Roberto Leoni, Mattias Beck, Jerome Faist
11 February 2015 • 11:35 - 11:50 AM | Part of SPIE OPTO

Room-temperature zero-bias plasmonic THz detection by asymmetric dual-grating-gate HEMT
Takayuki Watanabe, Tetsuya Kawasaki, Akira Satou, Stephane Boubanga Tombet, Tetsuya Suemitsu, Guillaume Ducournau, Dominique Coquillat, Wojciech Knap, Hiroaki Minamide, Hiromasa Ito, Yahya M. Meziani, Vyacheslav V. Popov, Taiichi Otsuji
11 February 2015 • 9:30 - 9:50 AM | Part of SPIE OPTO

Octave spanning semiconductor laser
Markus Roesch, Giacomo Scalari, Mattias Beck, Jerome Faist
10 February 2015 • 10:45 - 11:00 AM | Part of SPIE OPTO

Continuously-tunable ultrastrong light-matter interaction
Curdin Maissen, Giacomo Scalari, Mattias Beck, Jerome Faist
8 February 2015 • 3:15 - 3:30 PM | Part of SPIE OPTO

Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy
Giacomo Coslovich, Sascha Behl, Bernhard Huber, Takao Sasagawa, Wei-Sheng Lee, Zhi-Xun Shen, Hans A. Bechtel, Michael C. Martin, Robert A. Kaindl
10 February 2015 • 4:30 - 4:45 PM | Part of SPIE OPTO

Quantum cascade lasers for broadband spectroscopy
Jerome Faist
11 February 2015 • 10:30 - 11:00 AM | Part of SPIE OPTO

Temporal characterization of full attosecond pulse by THz streaking
Fernando Ardana Lamas, Christian Erny, Andrey Stepanov, Ishkhan Gorgisyan, Pavle Juranic, Christoph P. Hauri
11 February 2015 • 4:50 - 5:05 PM | Part of SPIE OPTO

Nonlinear conversion efficiency of InAs/InP nanostructured Fabry-Perot lasers
Heming Huang, Kevin Schires, Mohamed-Essghair Chaibi, Philip J. Poole, Didier Erasme, Frederic Grillot
11 February 2015 • 11:30 - 11:50 AM | Part of SPIE OPTO

Design and fabrication of 3D high-contrast metastructure THz cage waveguides
Gerard T. Dang, Monica Taysing-Lara, Weimin Zhou, Tianbo Sun, Weijan Yang, Connie Chang-Hasnain
12 February 2015 • 9:30 - 9:45 AM | Part of SPIE OPTO

Split ring resonator based THz-driven electron streak camera featuring femtosecond resolution
Justyna Fabianska, Gunther Kassier, Thomas Feurer
11 February 2015 • 5:05 - 5:20 PM | Part of SPIE OPTO

Mode conversion based on the acousto-optical interaction in hybrid photonic-phononic waveguide
Guodong Chen, Ruiwen Zhang, Xiong Huang, Heng Xie, Ya Gao, Danqi Feng, Junqiang Sun
11 February 2015 • 12:30 - 12:50 PM | Part of SPIE OPTO

The laser infrastructure of the ELI attosecond light pulse source
Karoly Osvay, Patricio Antici, Dimitris Charalambidis, Eric Cormier, Zsolt Diveki, Peter Dombi, Jozsef A. Fulop, Mikhail Kalashnikov, Nelson Lopes, Rodrigo Lopez-Martens, Giuseppe Sansone, Ervin Racz, Kahaly Subhendu, Zoltan Varallyay, Katalin Varju
12 February 2015 • 9:00 - 9:30 AM | Part of SPIE LASE

Recent advances in the field of vertical-external-cavity surface-emitting lasers
Arash Rahimi-Iman, Mahmoud Gaafar, Dalia Al Nakdali, Christoph Moller, Fan Zhang, Matthias Wichmann, Mohammad K. Shakfa, Ksenia A. Fedorova, Wolfgang Stolz, Edik U. Rafailov, Martin Koch
9 February 2015 • 9:50 - 10:20 AM | Part of SPIE LASE

THz quantum cascade lasers operating on the radiative modes of a 2D photonic crystal
Yacine Halioua, Gangyi Xu, Souad Moumdji, Lianhe H. Li, Giles Davies, Edmund H. Linfield, Raffaele Colombelli
11 February 2015 • 4:20 - 4:50 PM | Part of SPIE OPTO

[delmarphotonics]

Terahertz THz generation - Del Mar Photonics supply variety of crystals for THz generation, including ZnTe, GaP, LiNbO3 and others

[delmarphotonics]

Terahertz-driven linear electron acceleration

Emilio Alessandro Nanni, Wenqian Ronny Huang, Kyung-Han Hong, Koustuban Ravi, Arya Fallahi, Gustavo Moriena, R. J. Dwayne Miller, Franz X. Kärtner
(Submitted on 18 Nov 2014 (v1), last revised 9 Mar 2015 (this version, v3))
The cost, size and availability of electron accelerators is dominated by the achievable accelerating gradient. Conventional high-brightness radio-frequency (RF) accelerating structures operate with 30-50 MeV/m gradients. Electron accelerators driven with optical or infrared sources have demonstrated accelerating gradients orders of magnitude above that achievable with conventional RF structures. However, laser-driven wakefield accelerators require intense femtosecond sources and direct laser-driven accelerators and suffer from low bunch charge, sub-micron tolerances and sub-femtosecond timing requirements due to the short wavelength of operation. Here, we demonstrate the first linear acceleration of electrons with keV energy gain using optically-generated terahertz (THz) pulses. THz-driven accelerating structures enable high-gradient electron or proton accelerators with simple accelerating structures, high repetition rates and significant charge per bunch. Increasing the operational frequency of accelerators into the THz band allows for greatly increased accelerating gradients due to reduced complications with respect to breakdown and pulsed heating. Electric fields in the GV/m range have been achieved in the THz frequency band using all optical methods. With recent advances in the generation of THz pulses via optical rectification of slightly sub-picosecond pulses, in particular improvements in conversion efficiency and multi-cycle pulses, increasing accelerating gradients by two orders of magnitude over conventional linear accelerators (LINACs) has become a possibility. These ultra-compact THz accelerators with extremely short electron bunches hold great potential to have a transformative impact for free electron lasers, future linear particle colliders, ultra-fast electron diffraction, x-ray science, and medical therapy with x-rays and electron beams.

[delmarphotonics]

GaSe crystal in 1 inch diameter holder We cut outer side of the
holder base to be 45 degrees to increase the angle of incidence.
The clear aperture is 5 mm for a normal incidence alignment.
Opening of the other side (cover) will be as large as 12-14 mm
so that the crystal can be used at a large angle of incidence. It
means that the back side has 5 mm opening and the cover side
has 12-14 mm opening. Thickness of the clear aperture area is
reduced to be 50 micrometers. A 3mm thick cover will be used.
GaSe crystal thickness: 50 microns

[delmarphotonics]

 CR-GaSe-10-10-0.5 GaSe crystal, Z-cut, 10x10x0.5 mm 
 CR-GaSe-10-10-1 GaSe crystal, Z-cut, 10x10x1 mm 
 CR-GaSe-5-5-0.1 GaSe crystal, Z-cut, 5x5x0.1 mm 
 CR-GaSe-5-5-0.15 GaSe crystal, Z-cut, 5x5x0.15 mm 
 CR-GaSe-5-5-0.2 GaSe crystal, Z-cut, 5x5x0.2 mm 
 CR-GaSe-5-5-0.35 GaSe crystal, Z-cut, 5x5x0.35 mm 
 CR-GaSe-5-5-1 GaSe crystal, Z-cut, 5x5x1 mm 

[segorov]

TERAHERTZ IMAGING: 2.8 THz QCL and IR camera capture real-time images
Short enough to provide submillimeter resolution capability, yet long enough to penetrate most nonmetallic materials, terahertz waves in the 0.3 to 10 THz spectral range are being exploited for detection of concealed objects and even for medical applications in distinguishing cancer from normal tissue, thanks to the nonionizing impact of this radiation (see In the quest to develop cost-effective and commercially viable terahertz sources and detectors, collaborating researchers from the Naval Postgraduate School (Monterey, CA), Agilent Laboratories (Santa Clara, CA), and the University of Neuchâtel (Neuchâtel, Switzerland) have developed a real-time imaging system capable of distinguishing between plastic and metal that uses a commercially available uncooled infrared (IR) microbolometer camera and a milliwatt-scale 2.8 THz quantum-cascade laser (QCL).1
Sensitivity of the 160 × 120-pixel focal-plane-array (FPA) camera was first assessed theoretically to determine whether the camera was capable of satisfactorily detecting terahertz radiation without an external source of illumination. Evaluation of the noise-equivalent temperature-difference (NETD) capability of the camera revealed that the total background power density incident upon the FPA in the 1 to 5 THz region was only 12 W/m2 at 300 K—significantly below the 170 W/m2 in the 8 to 14 µm wavelength range for which the camera was designed. This yields an NETD value for the terahertz regime that is at least a full order of magnitude greater than that for the infrared.
Not only did the analysis confirm the need for external illumination when using the microbolometer camera to image terahertz radiation, but several optical modifications to the camera system were necessary to maximize the amount of terahertz radiation received by the FPA. Namely, the original antireflection-coated germanium lens on the camera—which attenuated terahertz radiation—was replaced by a biconvex lens made of Picarin material from Microtech Instruments (Eugene, OR). Picarin, with a transmission value of 0.65 at 2.8 THz, was also used for the FPA’s cryostat window.
The QCL used in the imaging system was fabricated by molecular-beam epitaxy and consisted of a multiple-quantum-well active region on a semi-insulating gallium arsenide substrate. The 14 × 200 µm rectangular active facet produces an elliptical beam that passes through a cryostatic cooler and is collimated by two off-axis parabolic mirrors.
Image averaging
For imaging experiments, various metal objects were concealed within plastic, cloth, and paper, and placed midway between the parabolic mirrors to ensure that a focused image formed on the microbolometer FPA. The laser was operated at a 300 kHz repetition range for single-frame imaging; however, image-averaging techniques were applied to multiple still images to reduce noise and improve overall image quality (see figure).
A commercially available infrared microbolometer camera images radiation from a 2.8 THz quantum-cascade laser to reveal metal obscured within opaque plastic tape (top left). A single-frame image (top right) and a computational average of 50 images (bottom left) can be further refined by image-processing software to remove noise and produce a clearer image (bottom right). (Courtesy of Naval Postgraduate School.)
Click here to enlarge image
Despite the presence of diffraction effects in the images due to QCL rectangular aperture diffraction and etalon effects between the Picarin lens and cryostat window, metallic objects obscured by opaque materials are easily imaged by this technique.
“This imaging scheme has proven to be a very versatile method of obtaining real-time imaging with an uncooled detector—two features that have been difficult to achieve, simultaneously, in the terahertz regime, ” said Barry N. Behnken, researcher and Ph.D. candidate at the Naval Postgraduate School. “More recently, we’ve expanded our experiments to include the use of a 3.6 THz QCL; operating at a shorter wavelength range has allowed us to image with better resolution and much longer persistence times. Interestingly, it has also provided sufficient contrast to successfully image many types of nonmetallic materials—including some surprising security features embedded within foreign currency notes.”
Gail Overton

REFERENCE
1. B.N. Behnken et al., Optics Lett. 33(5) 440 (2008).

[segorov]

Terahertz quantum-cascade lasers
Six years after their birth, terahertz quantum-cascade lasers can now deliver milliwatts or more of
continuous-wave coherent radiation throughout the terahertz range — the spectral regime between
millimetre and infrared wavelengths, which has long resisted development. This paper reviews the
state-of-the-art and future prospects for these lasers, including efforts to increase their operating
temperatures, deliver higher output powers and emit longer wavelengths.

[delmarphotonics]

GaSe crystal, Z-cut, 10x10x1 mm
[CR-GaSe-10-10-1]
Material GaSe
Size 10x10x1 mm
Orientation Z-cut
Polish 2 faces
Coating no
Application infrared nonlinear crystal and THz applications
Additional Information in ø 1 inch holder