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This conference brings together researchers and engineers from academia, industry, and government laboratories to explore and present work in the frequency range covering approximately less than 1 GHz (300 mm) to greater than 3 THz (100 μm) as well as infrared including near, mid and far infrared. Papers on RF and millimeter and infrared technology including advances in wireless communications, radar, lidar, microwave and mm-wave photonics, metamaterials, antennas, phased array radar, modulation, security, monitoring, detection, imaging are encouraged. Papers in photonic-related fields including, but not limited to, radio over fiber (RoF) RF photonics including photonic generation of microwave signals, photonic processing of microwave signals, and photonic distribution of microwave signals and semiconductor (including Si, SiC, SOI, GaAs, GaN, InP, SiGe, diamond, graphene and other materials) RF, mm-wave and terahertz devices and related applications are also encouraged, as well as the hybrid photonic systems and applications. Terahertz (THz) technology deals with the generation and utilization of electromagnetic energy covering what is also known as the sub-millimeter wave region of the spectrum. In this region, which lies between the millimeter wave and far infrared spectral regions, materials exhibit properties that can be exploited to advantage for use over a broad range of important technologies and applications. Papers on terahertz photonics including photonic generation and detection of terahertz waves to/or infrared, THz to/or infrared lasers are also encouraged.

This conference includes low- to high-power sources, detectors, amplifiers, systems, including both photonic and electronic modulated sources, detectors, and systems as well as nanodevices, nanomaterials, nanotechnology, nanostructures, etc. At THz frequencies, the primary difficulty encountered by scientists and engineers working in this field is the lack of convenient and affordable sources and detectors of terahertz radiation, but this difficulty is gradually changing as new sources and improved detectors are being developed as the technology continues to mature and broaden. At RF and millimeter frequencies, more and more hybrid systems are being integrated with photonic devices that enhance the functions, specifications and stabilities tremendously compared to their traditional counterpart systems. The purpose of this conference is to gather scientists and engineers from a diverse set of disciplines, who are interested in either learning more about terahertz and sub-millimeter and millimeter wave and RF technology and related and coupled technologies, or who are contributing to the field through their own research, development, or manufacturing activities.

This conference also includes hybrid technologies including, for example, microwave to THz wearable devices of any type and form as well as microwave to THz communications and data links, artificial intelligence, machine learning virtual reality and augmented reality in microwave to THz, GHz, mm-wave, sub-mm-wave, microwave and IRimaging, etc.

Disciplines utilizing terahertz technology include physical chemistry (certain molecules or molecular segments exhibit strong resonances in the 10 cm-1 to 100 cm-1 spectral region), military, and homeland security (terahertz radiation can penetrate clothing and packing materials but is reflected by metals and other materials), biomedical technology (tissue exhibits reflection and absorption properties that change dramatically with tissue characteristics), medical and dental, secure short-distance wireless communications (atmospheric water content prevents terahertz radiation from traveling very far), astronomy (the cold background of the universe exhibits a peak in this spectral region), space communications (where the terahertz region is wide open for use) and other disciplines where new, yet-to-be-discovered applications will undoubtedly come forth. Since the low energy associated with terahertz radiation is expected to be no more harmful than infrared or microwave radiation, safety issues are not expected to limit the use of terahertz radiation at low-power levels.

Papers on power supplies and electronic power conditioners and associated power protection systems including energy-efficient power supplies are also encouraged.

Papers are solicited in the following and related areas:

Terahertz sources RF, sub-millimeter-wave, and millimeter-wave sources Detectors and sensors High-power sources, modules, and systems Terahertz, IR, RF, millimeter-wave, and sub-millimeter-wave passive components Materials for THz and GHz devices Enhancements, improvements and advances in RF, millimeter-wave and sub-millimeter wave generation, modulation and detection Simulations and modeling Spectroscopy and frequency metrology Biomedical applications Communication and sensing systems Imaging and security Astronomy, Space and other areas of photonics, light, and matter Innovations Power supplies and electronic power conditioners Organic electronics Infrared devices, communications, sources, sensors, and detectors Small satellites Additive manufacturing and 3D printing ;
In progress – view active session
Conference 12000

Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XV

In person: 25 - 27 January 2022
View Session ∨
  • 1: Antennas
  • 2: Electronics for Detection, Mixing, Processing, and Communications
  • 3: THz Sources
  • 4: Spectroscopy and Related Technologies
  • 5: RF, Millimeter and Submillimeter-Wave Generation, Modulation, and Detection I
  • 6: RF, Millimeter and Submillimeter-Wave Generation, Modulation, and Detection II
  • 7: THz Frontiers
  • 8: Innovations in THz and IR
  • Posters-Wednesday
  • 9: Characterization of Materials and Devices
  • 10: THz Applications
Information

POST-DEADLINE ABSTRACT SUBMISSIONS

  • Submissions are accepted through 06-December
  • Notification of acceptance by 20-December

View Call for Papers PDF Flyer
Session 1: Antennas
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Marco Rahm, Technische Univ. Kaiserslautern (Germany)
12000-1
Author(s): Chandan Kumar, Sanjeev Kumar Raghuwanshi, Indian Institute of Technology Indian School of Mines Dhanbad (India)
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In this paper, initially a photonic crystal is proposed which consists of cylindrical air gap in periodical manner and its performance is investigated at terahertz frequencies by varying the radius of the air gap. Furthermore, a different PBG crystal loaded with rectangular symmetrical air gap is also designed and effects due to change in the structure and orientation is analyzed. Then, a microstrip array antenna on the 2-D photonic crystal is designed and its electromagnetic characteristics are analyzed and compared with that of the existing non air gap antenna. The proposed array antenna uses low loss Arlon AR1000 substrate (relative permittivity Єr =10, dielectric loss tangent δ=0.003, thickness h=127 µm) with an air gap of radius 200 µm symmetrically situated at a period of 250 µm.
12000-2
Author(s): Wei-Chih Wang, Univ of Washington (United States); Prabir Garu, National Tsing Hua University (Taiwan)
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A gradient log-spiral antenna is designed in this study by the special arrangements of different log-spiral arms. The unit cell antenna can achieve an average absorption ˃88.5% from 4.5 to 100 THz under normally incident plane waves. The absorption of the antenna is incident angle insensitive up to 45o and polarization independent up to 75o for both the transverse electric (TE) and transverse magnetic (TM) modes. The antenna shows high directivity of 6.68 dBi and high gain of 3.55 dB with 3dB beam width 59.2o. This innovative design approach opens a new path for thermal detection, bolometer, and energy harvesting research.
12000-3
Author(s): Gergo P. Szakmany, Edward C. Kinzel, Gary H. Bernstein, David Burghoff, David G. Gonzalez, Alexei O. Orlov, Wolfgang Porod, Univ of Notre Dame (United States); Stephen M. White, Space Vehicles Directorate (United States)
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We develop thermoelectrically coupled nanoantennas (TECNAs) that are radiation-field-type detectors. TECNAs capture radiation using a nanoantenna that is polarization-sensitive plus a nanothermocouple. The nanoantenna resonantly absorbs the incident IR radiation and heats the hot junction of the nanothermocouple. Here, we present TECNAs with log-spiral antennas capable of distinguishing left- and right-handed circular polarization (LHCP/RHCP). When the polarization direction matches the antenna chirality, the EM field is concentrated at the center of the antenna. The temperature increase at the center of the nanoantenna for the two polarization directions is different and provides an experimentally measured extinction ratio of ~5.
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In this presentation, we describe the material characteristics, device design, and device manufacturing process of high performance, low loss 3D printed GRIN lenses. To validate the technology, a simple cylindrical, radially symmetric GRIN horn lens was designed and printed using a commercial DLP printer and low loss polymer dielectric material. The lens was mounted to a standard horn antenna and served to increase gain and reduce sidelobes without dramatically increasing the overall horn antenna device size. The device was tested in the Ka band, and the practical test results are compared against HFSS simulated results.
12000-5
Author(s): Sanjeev Kumar Raghuwanshi, Indian Institute of Technology Indian School of Mines Dhanbad (India)
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A simulation and characteristics of an antenna using a novel substrate material that is utilized to resonate high frequencies in the Terahertz range. The microstrip antenna concept was used to create the Antenna. Using various forms, the Nanoantenna was developed and performed in the program HFFS simulation. The simulation results demonstrate a bandwidth is an increase as well as a loss response decrease, yielding 5THZ-10THZ of the frequency range, that can be utilized for a variety of applications such as image-processing applications and security, remote detection, and research on flexible electronic devices.
12000-6
Author(s): Chandan Kumar, Sanjeev Kumar Raghuwanshi, Indian Institute of Technology Indian School of Mines Dhanbad (India)
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Nanoantennas are critical in the growing fields of photonics and plasmonics, as they are the most effective tools for regulating, manipulating, and interacting the charge particles of material, i.e. electrons, with light propagating through it. Nanoantennas are widely used in several applications which includes high-speed communication in nano-networks with data rate of gigabyte per second, gas recognition, inter-chip transmission, biosensing of some chemicals and biological adaptation.In this paper, several nano antennas structures are analyzed and their characterization is studied. Complications in fabrication methods are also discussed. Nano antennas are compared with their optical counterparts and pros and cons are shown. Plasmonic nano antennas are the recent advancements and discussed in details. In the last section, various applications of nano antennas are shown.
Session 2: Electronics for Detection, Mixing, Processing, and Communications
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Tianxin Yang, Tianjin Univ. (China)
12000-7
Author(s): Michael S. Shur, Xueqing Liu, Rensselaer Polytechnic Institute (United States)
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Short channel Si CMOS have been used as the THz detectors and have found applications in the THz imaging arrays. Sub-terahertz excitation of phase-shifted resonant or overdamped plasma waves in a short CMOS channel enables the operation of such TeraFETs as THz spectrometers. Further developments in Si CMOS sub-THz and THz applications will use Si CMOS integrated circuits. Examples of such circuits include the line-of-sight detectors (very important for future 300 GHz band 6G communications), travelling wave sub-THz amplifiers, and frequency-to-digital converters.
12000-8
Author(s): Dong Woo Park, Jun-Hwan Shin, Eui Su Lee, Jungsoo Kim, Ho Sung Kim, Dong hun Lee, Joon Ki Lee, Il-Min Lee, Kyung Hyun Park, ETRI (Korea, Republic of)
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In this study, we report GaAs SBD-based subharmonic mixer for THz communication in the 220-330 GHz band. n GaAs:Si and n++ GaAs:Si were grown on semi-insulating GaAs substrate by using metal-organic chemical vapor deposition. Antiparallel(AP)-SBD was fabricated using the i-line stepper. The schottky junction, defined to be less than 1 um, has been composed of Ti/Pt/Au. The I-V and C-V characteristics of the fabricated AP-SBD were measured for the ideal factor, series resistance, current parameter, junction capacitance and parasitic capacitance. RF matching and LO and IF filters were designed with HFSS capable of 3D electromagnetic wave computational simulation. We also simulated the GaAs subharmonic mixer circuit using the nonlinear analysis of ADS. The conversion loss of the mixer module was measured and compared with the computational simulation results. Finally, we demonstrate the THz communication with 50 Gbps QPSK signal in the 300 GHz band.
12000-9
Author(s): Benjamin Walter, Vmcro SAS (France); melanie lavancier, romain peretti, Jean-Francois Lampin, Stefano Barbieri, IEMN - CNRS (France)
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We report the operation of a Terahertz (THz) detector exploiting the bi-material effect to resonantly excite a cantilever (CL) of micrometric size. The detector is fabricated on a SOI substrate and coupling to the incident THz radiation is obtained using two coupled aluminum half-dipole antennas. The induced CL deflection is readout optically with a 1.5um laser. At 300K and 2.5THz, we obtain a peak responsivity of ~2 x 108pm/W for the fundamental bending mode. This yields a NEP of ~20nW/Hz1/2 at 2.5THz, i.e. of ~2nW/Hz1/2 at 3.8THz, corresponding to the antenna peak absorption. Finally, the low mechanical quality factor of the mode grants a broad frequency response of approximately 100kHz, i.e. a response time of ∼10 μs
12000-10
Author(s): Yusuke Kawai, Kazutoshi Kato, Kyushu University (Japan)
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To improve physical-layer security, we have proposed a novel wireless communication system based on our beam steering technologies of terahertz waves. In this system, two terahertz-wave beams with different data are radiated from different locations and are overlapped at a target area by beam steering. Then, a coherent receiver decodes original data by AND operation or coherent detection between two datas. This time, as a feasibility demonstration, we performed an AND operation between two datas and measured the bit error rate of the original information to be transmitted.
Session 3: THz Sources
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Tianxin Yang, Tianjin Univ. (China)
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In this work, we reported the 1.55 ㎛ ridge-type dual mode laser(R-DML) as a THz communication beating source. It have many advantages of cost effects, compactness and simplification of fabrication by introducing the ridge-type waveguides. We have demonstrated 10Gbps THz wireless communications with 10-3 BER (bit-error-rate) without digital signal processing.
12000-12
Author(s): Jungsoo Kim, Eui Su Lee, Dong Woo Park, Jun-Hwan Shin, Dong Hun Lee, Joon Ki Lee, Il-Min Lee, Kyung Hyun Park, ETRI (Korea, Republic of)
12000-13
Author(s): Basem Y. Shahriar, Brett N. Carnio, Eric Hopmann, Abdulhakem Y. Elezzabi, University of Alberta (Canada)
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We present an efficient and compact laser pulse-pumped terahertz (THz) source suitable for on-chip applications. The THz emitter itself consists of a W(1.8 nm)/Fe(2 nm)/Pt(1.8 nm) metallic trilayer deposited via DC magnetron sputtering. Waveguides and a horn antenna are 3D-printed via 3D lithography and integrated with the emitter, resulting in a 19.6 dB increase in the measured THz power emitted at the design frequency of 1.5 THz.
12000-14
Author(s): Basem Y. Shahriar, Abdulhakem Y. Elezzabi, University of Alberta (Canada)
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We investigate the effect of surface oxide contamination on the terahertz (THz) emission via the inverse spin Hall effect from spintronic Fe/Pt bilayers pumped using femtosecond laser pulses. The metallic films were grown on Si and quartz substrates, both with and without a 300 nm Al2O3 spacer layer. The presence of the Al2O3 layer between the substrate and the metallic films results in a 350% increase in the measured THz electric field in the case of Si substrates, while an increase of 10% is observed when using quartz substrates. X-ray photoelectron spectroscopy (XPS) is used to gain insight into the elemental composition of the emitters, and the presence and intensity of iron oxide peaks explains the difference in the emitted THz signals.
12000-15
Author(s): Ping Keng Lu, Deniz Turan, Mona Jarrahi, UCLA Samueli School Of Engineering (United States)
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We demonstrate a bias-free, telecommunication-compatible, photoconductive terahertz source which uses a linear gradient of Indium composition in a highly Be-doped InGaAs layer to create a built-in electric field that extends deep into the substrate, leading to efficient collection of almost all optically generated electrons. Additionally, a large area plasmonic nanoantenna array is utilized to enhance the optical absorption at 1550 nm near each nanoantenna to reduce the average electron transit time to the radiating elements. With the graded InGaAs-based terahertz source, we experimentally demonstrate a 4-fold increase in radiation power compared to previously demonstrated passive plasmonic terahertz sources.
Session 4: Spectroscopy and Related Technologies
Session Chairs: Robert H. Giles, Univ. of Massachusetts Lowell (United States), Marco Rahm, Technische Univ. Kaiserslautern (Germany)
12000-16
Author(s): Katja Dutzi, Nico Vieweg, Patrick Leisching, Toptica Photonics AG (Germany); Andreas Steiger, Physikalisch-Technische Bundesanstalt (Germany)
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Thickness gauging of high-tech textiles and their coatings is challenging as fabrics are structured, flexible materials and coatings can penetrate into the surfaces during application. We present fast, non-contact terahertz thickness measurements of acrylate coated polyester knit fabrics. The spectroscopic characterization of the textiles reveals strong influences of the knitted structure on the determined terahertz properties, for example birefringence effects. Taking these into account, the layer thickness is determined using terahertz reflection measurements and verified with raster electron microscopy. The setup developed in the project TeraMeTex, consists of a fast ECOPS-based THz-TDS system (1600 Hz) and a customized, rugged measurement head, which is ideally suited for online thickness gauging.
12000-17
Author(s): Karen K. Lin, A*STAR IMRE (Singapore); Zheng Liu, Nanyang Technology University (Singapore)
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A growing interest in antiferromagnetic spin motion at terahertz (THz) frequencies has led to the development of fast spintronic devices, but their smaller responses to external fields limit their use. An anomalous Hall effect (AHE) has been observed at room temperature in noncollinear antiferromagnet semimetals such as 2D Fe5GeTe2 and 3D SrIrO3. These semimetal materials were studied using TDS-THz to determine equilibrium THz conductivity. In addition, a room-temperature OPTP was used to analyze the ultrafast carrier dynamics. in future, the spin-to-charge interconversion devices with low power consumption can be designed using oxide materials from 2D and 3D structures.
12000-18
Author(s): Zhenyang Xiao, Xinyu Liu, Badih Assaf, David Burghoff, Univ of Notre Dame (United States)
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We studied the carrier dynamics of TI Pb1-xSnxSe through optical pump-terahertz probe measurements at different temperatures. We observed anomalous negative photoconductivity introduced by the photoexcitation at low temperatures, which is caused by the increasing scattering rate of Dirac electrons. A decay time of ~6 ps is observed for the Dirac electrons. Both positive and negative photoconductivity is observed at moderate temperatures, which can be explained by the coexistence of the gapless Dirac cone and the bulk states. However, at room temperature, only massive fermions with ~27 ps decay time are presented, due to the non-existence of the gapless Dirac cone.
12000-19
Author(s): Felix Fobbe, RUHR UNIVERSITAET BOCHUM, PULS (Germany); Robert Kohlhaas, Björn Globisch, Fraunhofer HHI (Germany); Benjamin Rudin, Florian Emaury, Menhir Photonics (Switzerland); Clara J. Saraceno, RUHR UNIVERSITAET BOCHUM, PULS (Germany)
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We demonstrate THz generation with state-of-the-art iron doped InGaAs photoconductive emitters using a low-noise GHz repetition rate amplified femtosecond laser operating at a central wavelength of 1560 nm. We measure a maximum dynamic range of over 75 dB and a bandwidth of more than 3 THz using lock-in technique. This unique laser source combining low-noise and high repetition rate proves to be a promising alternative to the frequently used fiber lasers at 100 MHz.
Session 5: RF, Millimeter and Submillimeter-Wave Generation, Modulation, and Detection I
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Robert H. Giles, Univ. of Massachusetts Lowell (United States)
12000-20
Author(s): William L. Beardell, Garrett J. Schneider, Janusz Murakowski, Dennis W. Prather, University of Delaware (United States)
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Next-generation communications systems are universally expected to enable drastic improvements in communication channel latency, instantaneous bandwidth, and user density. In this submission, we share theory and techniques for RF-photonic detection, localization, and recovery of millimeter-wave signals, bringing user localization time down to a near-instantaneous time frame, and the use of an optical heterodyne technique to recover the data streams upon each RF channel. Future configurations are discussed, which will both improve efficiency and reduce cost, size, weight and power (C-SWAP) requirements with the goal of realizing a consolidated RF-photonic base station for use with emerging networks.
12000-21
Author(s): mengxi tan, Swinburne Univ of Technology (Australia); xingyuan xu, Monash University (Australia); Arnan Mitchell, RMIT University (Australia); David J. Moss, Swinburne Univ of Technology (Australia)
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We demonstrate a user-defined RF AWG as well as phase-encoded signal generator based on a soliton crystal micro-comb source in an integrated MRR with a free spectral range (FSR) of ~49 GHz. Owing to the soliton crystal’s robust and stable operation and generation, as well as high intrinsic efficiency, RF AWGs and phase-encoded signal generators with simple operation and fast reconfiguration are realized. The soliton crystal source in our system is integrated, which greatly reduces footprint. Other components of the system have also been demonstrated in integrated form. Thus, our system has great potential for substantially higher levels of integration and ultimately achieving fully monolithically integration.
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We report on pulse amplitude modulation (PAM) communication in the terahertz (THz)-band using an integrated-optic PAM signal emulator, which consists of asymmetric Mach-Zehnder interferometer (MZI). The asymmetric MZI, whose edge couplers are composed of symmetric MZIs (coupling ratio tunable couplers), produces an optical PAM signals from an input optical on-off keying signal by adjusting each phase shift at each interferometer arm. We generated an optical 25 Gsymbol/s three-level PAM (PAM3) signal with this emulator and converted the generated optical signal into a PAM3 signal in the 300 GHz band with high-speed photo-mixing. We show obtained results on the THz-wave 25 Gsymbol/s PAM3 communication in detail.
12000-23
Author(s): Sanjeev Kumar Raghuwanshi, Indian Institute of Technology Indian School of Mines Dhanbad (India)
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Design and characteristics analysis of high isolation of 3X3 series feed square MSA antenna array is discussed in this paper, having six ports, compromise 3X3 edge feed square patches are interconnected with each other. A sequential and simultaneous excitation takes place to each port/ plane to achieve the beam scanning mechanism. Vary the phase of each port to visualize the beam scanning phenomenon from -29.5 Deg to +29.5 Deg. the simulated and measured return loss result, gain profile, and the radiation pattern are verified to prove the beam scanning range is ± 29.5 deg. The surface currents distribution of each port of the proposed antenna array and the E-field and H-field radiation pattern were studied for evaluating the parameter such as reflection coefficient, individual port total gain, SLL, (side lobe label), half-power beamwidth (HPBW) and FBR (front to back ratio) are also investigated for all vertical and horizontal port individually and combined.
12000-24
Author(s): Takahiro Kaji, Isao Morohashi, Yukihiro Tominari, Toshiki Yamada, Akira Otomo, NICT (Japan)
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In Beyond 5G wireless communication, the radio-over-fiber (RoF) technology that transmits signal waveforms of terahertz waves (0.1-10 THz) using optical fibers will be important. To realize such technology, it is required to develop a device that converts a terahertz signal into an optical signal. Organic electro-optic (EO) polymers can have large EO coefficients (> ~100 pm/V) and realize ultra-high-speed optical modulation of several hundred GHz or more. In this research, we prototyped 150-GHz-band antenna-coupled optical modulators with EO polymer waveguides and patch antenna arrays using a transfer and bonding method of a poled EO polymer film.
12000-25
Author(s): Tomoyuki Uehara, National Defense Academy (Japan)
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A generated microwave by optical beat note of two lasers connected with optical fibers is attractive for the purpose of transmitting and receiving microwaves in underground facilities (called radio wave insensitivity zones). The frequency stability of the generated microwaves of two lasers at 7 GHz is stabilized using frequency locking scheme and stability was measured. And the generated microwave is radiated from a horn antenna, and the electric field strength and phase of the microwave are measured by an optical electric field strength sensor connected to the optical fiber.
Session 6: RF, Millimeter and Submillimeter-Wave Generation, Modulation, and Detection II
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Tianxin Yang, Tianjin Univ. (China)
12000-26
Author(s): Dipen Barot, National Institute of Standards and Technology (United States), University of Colorado Boulder (United States); Ari Feldman, Brian R. Washburn, National Institute of Standards and Technology (United States)
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Advances in millimeter-wave (mm) devices demand ultrafast measurement systems with fast acquisition times. Conventionally used synchronous electro-optic sampling (SEOS) system afflicts long acquisition time, limited time-window, and requires stabilized delay path. We have built an asynchronous electro-optic sampling (AEOS) system based on dual optical frequency combs which overcomes the disadvantages of EOS and measured an mm-wave pulse. Our AEOS not only offers a time-window of 10 ns being scanned in 1 ms with a delay-step of 100 fs but also provides sensitivity better than 1 part in 100 for 1 sec averaging. The measured mm-wave pulse compared well with EOS.
12000-27
Author(s): M. N. Woodland, S. B. Kelly, C. R. Abell, Univ. of Massachusetts Lowell (United States); C. Lindsey, Univ. of Massachusetts Medical School (United States); Cecil S. Joseph, Robert H. Giles, Univ. of Massachusetts Lowell (United States)
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Patient motion during medical imaging can create significant degradation of images acquired in a clinical setting. Even breathing induced patient motion often leads to blurred imagery compromising its resolution and diagnostic utility. External motion tracking (EMT) technologies are one current method of tracking patient motion, but the current EMTs use radiation that is reflected off clothing or fixed markers, thus tracking only the patient’s garments. Researchers at U. Mass Worcester’s Chan Medical School and U. Mass Lowell’s Biomedical Terahertz Technology Center are seeking novel EMTs that use a part of the electromagnetic spectrum where clothing is transparent, designated as the millimeter wavelength region. For this purpose, the U. Mass. Team has developed a 75 GHz continuous-wave stepped frequency radar with 8 GHz bandwidth to investigate the system as a source-receiver tracking technology.
12000-28
Author(s): Maddy Woodson, Hannah Grant, Brandon Isaac, Estefano Fodor, Kenneth A. Hay, Steven B. Estrella, Gordon Morrison, Leif A. Johansson, Daniel S. Renner, Freedom Photonics, LLC (United States)
12000-29
Author(s): Brett N. Carnio, Univ of Alberta (Canada); Anis Attiaoui, Simone Assali, École Polytechnique de Montréal (Canada); Eric Hopmann, Univ of Alberta (Canada); Oussama Moutanabbir, École Polytechnique de Montréal (Canada); Abdul Elezzabi, Univ of Alberta (Canada)
Session 7: THz Frontiers
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Robert H. Giles, Univ. of Massachusetts Lowell (United States)
12000-30
Author(s): Mona Jarrahi, UCLA Samueli School of Engineering (United States)
12000-31
Author(s): Karen K. Lin, Nan Zhang, A*STAR Institute of Materials Research and Engineering (Singapore); Ali Abdel Aziem Abdel Gaied, A*STAR Institute of Materials Research and Engineering (Singapore), Nanyang Technological Univ. (Singapore), National Institute of Laser Enhanced Sciences (Egypt); Qingyang Steve Wu, Lei Zhang, Sergey Gorelik, A*STAR Institute of Materials Research and Engineering (Singapore); Zheng Liu, Nanyang Technological Univ. (Singapore); Erica M. L. Teo, Singapore Eye Research Institute (Singapore); Jodhbir S. Mehta, Yu-Chi Liu, Singapore Eye Research Institute (Singapore), Duke-NUS Medical School (Singapore)
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Corneal disease is a major cause of reversible blindness in the world. Monitoring the progression of human corneal edema or corneal scarring to prevent the disease entering into the end stage is crucial. We present a method for sensing human corneal composition at different depths, namely focused on the epithelium and stromal layer, using high sensitivity Terahertz (THz) broadband spectroscopy. Good correlation was observed between central corneal thickness (CCT) measurements and THz wave reflection signal intensities. Our results demonstrated that THz spectroscopy technique could even be able to obtain the information from different corneal sublayers, which provide holistic information for disease diagnosis in future.
12000-32
Author(s): Sven Becker, Tassilo Fip, Marco Rahm, Technische Univ. Kaiserslautern (Germany)
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We numerically and experimentally investigate the guiding, routing and manipulation of strongly confined spoof terahertz surface plasmon polaritons (terahertz SSPPs) on metasurface pathways. The pathways are of subwavelength width with respect to the SSPP wavelength. We measured the spatio- and spectro-temporal dynamics of the electric field of the SSPPs. We observed that the terahertz SSPPs exhibit a strong out-of-plane and in-plane confinement, even when they propagate on curves of subwavelength path width. Due to these beneficial electromagnetic properties, metasurface pathways of subwavelength width seem to be ideally suited for the implementation of on-chip terahertz networks and sensor systems.
Session 8: Innovations in THz and IR
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Robert H. Giles, Univ. of Massachusetts Lowell (United States)
12000-33
Author(s): Wei-Chih Wang, Chileung Tsui, Univ of Washington (United States)
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The goal of this project is to develop a gradient tunable fishnet metamaterial (TFMM) for THz wave manipulation. Here we present the investigation of several critical design and fabrication parameters of the basic fishnet metamaterial unit cell for the gradient structure. One study involves investigation of unit cell geometries. The others look into the effect of encapsulation of LC and pre-alignment of liquid crystals in the off state play in the outcome of the overall effects of the maximum index change due to input voltage. The objective is to have a broader tunability of the resonant frequency due to the change of the permittivity to obtain the maximum phase shift in the TFMM design.
12000-34
Author(s): Janusz A. Murakowski, Garrett Schneider, Dennis Prather, Univ of Delaware (United States)
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We describe a technique that allows using a linear fiber array to recover two-dimensional angle-of-arrival (AoA) information of incoming electromagnetic waves, in the context of an imaging receiver or an imaging radio-frequency (RF) radiometer. The method relies on spatially coherent electro-optic up-conversion of the incoming radio signals to the optical domain and it exploits the regular arrangement of antennas to map between different imaging topologies. Thus, we ‘unroll’ a two-dimensional beamspace pattern into a linear distribution of beams, which is suitable for a linear beam-forming processor. We explain the theoretical underpinning of method and present experimental results illustrating its viability.
12000-35
Author(s): Daniel Molter, Jens Klier, Joachim Jonuscheit, Fraunhofer ITWM (Germany); Georg von Freymann, Technische Universität Kaiserslautern (TUK) (Germany); Nico Vieweg, Katja Dutzi, Anselm Deninger, TOPTICA Photonics AG (Germany)
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Terahertz layer thickness measurements is one of the most promising fields of applications for terahertz technology. Measuring subwavelength layers in multilayer systems is most commonly achieved by applying retrieval algorithms. These algorithms are computational demanding, which makes it hard for the evaluation to keep up with the increasing speed of modern terahertz systems. ECOPS-based systems now achieve measurement rates above 1 kHz. By applying a highly efficient algorithm based on desktop-grade CPU, we achieve multilayer imaging at 1.6 kHz measurement rate. A three-layer system on a metal disk of 300 mm diameter is measured in 2.5 minutes with 240000 pixels.
12000-36
Author(s): Hannah I. West, Dennis Prather, Univ of Delaware (United States)
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Arrayed waveguide gratings are diffractive elements used in fiber-optic communications systems to separate or recombine signals of different frequencies. Here, we present on a fiber-based arrayed waveguide grating which uses greater path length differences to achieve sub-2 GHz frequency resolution. The microwave photonic device up-converts a microwave signal and allows its spectrum to be viewed instantaneously on a camera. To account for fluctuations within the fiber, active phase locking is used. We will also discuss how to adapt the device for improved frequency resolution and different bandwidth parameters.
Posters-Wednesday
In person: 26 January 2022 • 6:00 PM - 8:00 PM
Conference attendees are invited to attend the OPTO poster session on Wednesday evening. Come view the posters, enjoy light refreshments, ask questions, and network with colleagues in your field.

Poster Setup: Wednesday 10:00 AM – 5:00 PM
View poster presentation guidelines and set-up instructions at
https://spie.org/PW/Poster-Guidelines
12000-45
Author(s): Vladislav Zhelnov, Bauman Moscow State Technical Univ. (Russian Federation), A. M. Prokhorov General Physics Institute of the RAS (Russian Federation); Nikita Chernomyrdin, A. M. Prokhorov General Physics Institute of the RAS (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation); Anna Kucheryavenko, Gleb Katyba, A. M. Prokhorov General Physics Institute of the RAS (Russian Federation), Institute of Solid State Physics RAS (Russian Federation); Kirill Zaytsev, A. M. Prokhorov General Physics Institute of the RAS (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation)
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Terahertz solid immersion microscopy is an imaging modality providing subwavelength spatial resolution which have found numerous applications last decades. One of the features of SI optical systems is dependence of its spatial resolution on optical properties of the object. In our work we performed a numerical analysis, using the finite-difference time-domain technique and experimental study using set of objects with distinct refractive indices in order to uncover, for the first time, the object-dependent spatial resolution of this approach. Our findings revealed that the system resolution remains strongly sub-wavelength for the wide range of sample refractive indices and absorption coefficients.
12000-46
Author(s): Shin'ichiro Hayashi, NICT (Japan); Yoshiharu Urata, PHLUXi, Inc. (Japan); Seigo Ohno, Tohoku University (Japan); Katsuhiko Miyamoto, Chiba University (Japan); Norihiko Sekine, NICT (Japan)
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We demonstrated frequency controlled terahertz wave generation based on parametric wavelength conversion in a nonlinear MgO:LiNbO3 crystal. The pumping beam is generated using a PPLN-OPG seeded by a stabilized laser beam as traceable to the national standard. The generated pulses are amplified by a KTA-OPA pumped by a SLM Nd:YAG MOPA system. The seeding beam is monitored and controlled by a “spectral drill” cavity. The frequency of seeding beam is observed as intensity error signal. We expect that these methods will open up new fields.
Session 9: Characterization of Materials and Devices
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Marco Rahm, Technische Univ. Kaiserslautern (Germany)
12000-37
Author(s): Tianxin Yang, Tianjin Univ (China)
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To pursue the far-reaching goal of optical amplification of THz signals in a quantum system without population inversion, we propose a scheme to suppress the stimulated absorption at a frequency of several THz based on the quantum Zeno effect. In this talk the quantum Zeno effect and its applications in atomic systems are introduced. Then, a few promising solid-state materials in which atom-like systems can be used for Zeno effects are described for the purpose of amplifying THz signals. Finally the experiments to amplifying THz waves based on Zeno effect are discussed.
12000-38
Author(s): Carlo De Santi, Luca Pavanello, Univ of Padova (Italy); Gianluca Verona Rinati, University of Rome “Tor Vergata” (Italy); Gaudenzio Meneghesso, Enrico Zanoni, Matteo Meneghini, Univ of Padova (Italy)
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In this paper, we discuss the changes in the electrical performance induced by operating time in hydrogen-terminated diamond MESFETs for high power and high frequency applications. We detect an increase in on-resistance, a decrease in the saturation current, a shift in the threshold voltage and a decrease in the transconductance peak, caused by the increase in concentration of a 0.30 eV defect. Additional on-resistance transients and electroluminescence measurements were carried out to characterize the trapping and degradation process.
12000-39
Author(s): Karen K. Lin, A*STAR IMRE (Singapore); Zheng Liu, Nanyang Technology University (Singapore)
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To study the F-PVDF structure and demonstrate phonon modes behavior at different excitation energies, Micro-Raman spectroscopy and THz imaging, scanning electron microscopy images were performed and confirmed the formation of chains in the foam. The hysteresis loop was used to determine the degree of polarization for both the C and F PVDF samples. Detailed results will be reported. In applications requiring low dielectric constants, such as transmission and sensing at THz, these results pave the way for a more rapid polymer synthesis solution.
12000-40
Author(s): Zoltan Vilagosh, Saulius Juodkazis, Andrew W. Wood, Swinburne Univ of Technology (Australia)
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Attenuated total reflection coupled with synchrotron sources allow rapid evaluation of samples. The source is incoherent, thus only reflectance can be derived as phase shift data is not possible. A method of deriving the full complex dielectric parameters by reflecting the evanescent wave using various oil and alcohol samples with a mirror spaced 0.015 mm above the diamond crystal of the ATR is presented. The reflectance was enhanced by the mirror at lower frequencies but underwent a frequency dependent destructive interference at higher frequencies that varied according to the refractive index (but not the absorption coefficient) of the sample
12000-41
Author(s): Michele Cito, Univ of Glasgow (United Kingdom); Brett A. Harrison, University of Sheffield (United Kingdom); Toshikazu Mukai, RohmCo. Ltd. (Japan); Richard A. Hogg, Univ of Glasgow (United Kingdom)
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Low-temperature photoluminescence spectroscopy (PL) is used to characterize and compare high current density resonant tunnelling diodes (RTD) structures with different QW designs and material systems. Simple ternary AlAs/InGaAs/AlAs QW are compared with composite AlAs/InAs/InGaAs/AlAs structures varying the QW thickness and the position of the InAs sub-well. Measurement and simulation results are confirmed by the RTDs device IV characteristics in which we observe an increase in Jpeak intensity, in Vpeak and the voltage swing (∆V=Vvalley-VPeak), with important consequences on the device performance: the sub-well increases the RTD output power at the sacrifice of the power efficiency. We also highlight PL as a powerful, fast, and non-destructive characterization method to link wafer properties and device performance in standard and advance RTD structures.
Session 10: THz Applications
Session Chairs: Laurence P. Sadwick, InnoSys, Inc. (United States), Tianxin Yang, Tianjin Univ. (China)
12000-42
Author(s): Fumiyoshi Kuwashima, Fukui Univ of Technology (Japan); Mona Jarrahi, Electrical and Computer Engineering Department, University of California Los Angeles (United States); Osamu Morikawa, Chair of Liberal Arts, Japan Coast Guard Academy (Japan); Takuya Shirao, Kazuyuki Iwao, Fukui Univ of Technology (Japan); Kazuyoshi Kurihara, School of Education., University. of Fukui (United States); Kenji Wada, Department of Physics and Electronics, Osaka Prefecture University (Japan); Hideaki Kitahara, Takashi Furuya, Research Center for Development of Far-Infrared Region, University of Fukui (Japan); Makoto Nakajima, Institute of Laser engineering, Osaka Univ. (Japan); Masahiko Tani, Research Center for Development of Far-Infrared Region, University of Fukui (Japan)
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Stability of optical beats in a chaotically oscillating laser is compared to that of a free-running continuous-wave laser using a highly efficient plasmonic photomixer. Using a chaotically oscillating laser diode, stable optical beats are observed over an operation current range of 60-90 mA. The high stability of chaotically oscillating lasers makes these lasers promising candidates for optical pump sources in terahertz time-domain spectroscopy systems.
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We propose and report on a method that can demultiplex multiple carrier channels in the terahertz (THz) band by utilizing a THz-wave asymmetric interferometer. The frequency division multiplexing (FDM) channels are demultiplexed with the interferometer directly in the THz domain. As primitive investigation, we fabricated the asymmetric interferometer by employing THz-wave bulk components including lenses, splitters, and mirrors. We show primitive demultiplexed results of a 2 x 10 Gbit/s FDM on-off keying signal in the 300 GHz band with the interferometer, which was produced with a high-speed photo-mixer.
12000-44
Author(s): Cyprien Brulon, Patrick BOUCHON, Baptiste Fix, ONERA (France)
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In this work, we investigate the fabrication and the application of ultra-thin terahertz metasurfaces as thermal converters for indirect terahertz imaging. The microstructures fabricated by an ultrasonically driven printing process (Microplotter) are used to improve the THz to IR conversion efficiency and tune the spectral/polarisation selectivity. The resulting conversion membranes show optical and thermal responses which are consistent with numerical simulations establishing reliable rules to design such membrane at various wavelengths. This work paves the way for a low-cost solution of multispectral terahertz imaging with a standard infrared camera.
Conference Chair
InnoSys, Inc. (United States)
Conference Chair
Tianjin Univ. (China)
Program Committee
René Beigang
Technische Univ. Kaiserslautern (Germany)
Program Committee
Huazhong Univ. of Science and Technology (China)
Program Committee
Frank Ellrich
Technische Hochschule Bingen (Germany)
Program Committee
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM (Germany)
Program Committee
Univ. of Massachusetts Lowell (United States)
Program Committee
InnoSys, Inc. (United States)
Program Committee
UCLA Samueli School of Engineering (United States)
Program Committee
A*STAR Institute of Materials Research and Engineering (Singapore)
Program Committee
Daniel Molter
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM (Germany)
Program Committee
National Univ. of Ireland, Maynooth (Ireland)
Program Committee
National Univ. of Ireland, Maynooth (Ireland)
Program Committee
Electronics and Telecommunications Research Institute (Korea, Republic of)
Program Committee
Alessia Portieri
TeraView Ltd. (United Kingdom)
Program Committee
Marco Rahm
Technische Univ. Kaiserslautern (Germany)
Program Committee
A*STAR Institute of Materials Research and Engineering (Singapore)
Program Committee
Michael Weibel
Joint Research and Development, Inc. (United States)
Program Committee
Maddy Woodson
Freedom Photonics, LLC (United States)
Program Committee
Univ. of South Florida (United States)