The THz domain extending approximately from 100 GHz to 10 THz can be considered as a link between electronics and photonics. Since the beginning of the 1990s this field was growing first with the development of time-domain spectroscopy and now is becoming more and more attractive with the emergence of new technologies: quantum cascade lasers, nano-transistors, photomixing, mixers, frequency multipliers and material systems like novel semiconductor heterostructures exploiting nitride, zinc oxide based heterostructures, 2D nanostructures and van der Walls layered heterostructures. These materials and devices have already found many applications in different systems exploiting unique properties of the THz region of the electromagnetic spectrum. The optical excitation and control of spins in magnetic materials and structures opens new prospects for merging of spin-based devices and ultrafast photonic processing whereas terahertz spectroscopy presents an ideal tool for the study of spin dynamics in magnetic materials. Furthermore, novel optical and photonic systems recently emerged to further extend the THz research field to the investigations of phenomena at the nanoscale. Among the new trends in the THz technology there also are tunable, compact THz gas lasers, THz optical components manufactured with 3d printing, chip-level THz signal generation, THz imaging with a single pixel camera etc.

The conference is intended to provide a forum for scientists, engineers, and researchers from a diverse set of disciplines who are interested in presenting their last achievements in this field. The scope of the conference includes sources and detectors of THz radiation, optical components, optical and photonic systems, near field microscopy as well as different applications exploiting this technology.

Papers are solicited in the following areas:

FUNDAMENTALS OF GENERATION, DETECTION, AND PROPAGATION OF THz WAVES
SOURCES OF THz AND FAR-INFRARED RADIATION
THz DETECTORS
THz COMMUNICATIONS
IMAGING
SPECTROSCOPY
ULTRAFAST SPINTRONICS
THz OPTICS
THz MICROSCOPY
BIOMEDICAL APPLICATIONS
NEW TRENDS IN THz DEVICES
MATERIALS FOR THz DEVICES ;
Conference 11827

Terahertz Emitters, Receivers, and Applications XII

1 - 5 August 2021
Digital Forum: On-demand starting 1 August
View Session ∨
  • 1: New Trends in THz Technology
  • 2: Sources of THz Radiation
  • 3: THz Spectroscopy
  • 4: Materials for THz Devices and Components
  • 5: THz Detectors and Imaging
  • 6: Biomedical Applications
  • 6: Poster Session
Session 1: New Trends in THz Technology
11827-1
Author(s): Ileana-Cristina Benea-Chelmus, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
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The metrology of terahertz waves is a prerequisite for future applications in communications, sensing or spectroscopy. Electro-optic transduction, the technique by which a terahertz signal is mapped onto an optical or near-infrared signal, has emerged as one of the most sensitive metrology techniques that also provides sub-picosecond temporal resolution. As such, it has been employed to detect quantum terahertz fields for the first time. Recent advances in the miniaturization of these transducers target increased sensitivities, a small footprint and compatibility with large photonic architectures. In this talk, I will outline the basics of electric field metrology at the quantum limit and discuss how integrated photonics could open entirely new avenues in the area of spatially and temporally multiplexed terahertz detection.
11827-3
Author(s): Mayuri Kashyap, Aparajita Bandyopadhyay, Indian Institute of Technology Delhi (India); Karl Bertling, Aleksandar D. Rakic, The Univ. of Queensland (Australia); Amartya Sengupta, Indian Institute of Technology Delhi (India)
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Paper, as a hygroscopic dielectric material, does not have specific spectral signatures in the THz range from 0.2-6 THz. However, because of its constituent materials, including dry matter, moisture, and air pockets, it absorbs Terahertz radiation. Though the absorption loss is not significant, the varying levels of dampness are observed over time using continuous wave (CW) based THz Spectroscopic system, which is utilized for quantifying the moisture content of wet paper relative to paper at ambient environment. This work subsequently focuses on understanding the experimental results using effective medium theory (EMT) approaches and inductively, through supervised machine learning regression (SMLR) techniques.
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Terahertz band, which corresponds to the energy of intermolecular binding, is expected to enable us a non-labeling detection such as antigen-antibody binding. We aim to enhance the sensitivity by surface plasmon resonance (SPR) combined with the signal enhancement effect due to the selective resonant excitation of the specific binding. In this study, we have focused on the topological insulators. They enhance SPR in the THz band and confirm the occurrence of localized surface plasmon resonance by using periodic microstructures of well-crystallized and prefer-oriented Bi2Se3 thin films fabricated by a pulsed laser deposition. We also observed the avidin-biotin coupling by THz-SPR, which is the first experimental observation of biological material interactions through THz-SPR using the topological insulator.
Session 2: Sources of THz Radiation
11827-6
Author(s): Sukhdeep S. Dhillon, Lab. de Physique de l'Ecole Normale Supérieure (France)
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The use of fundamental modelocking to generate short terahertz (THz) pulses and THz frequency combs from semiconductor lasers has become a routine affair, using quantum cascade lasers (QCLs) as a gain medium. Here, using time-resolved THz techniques, we show the first of demonstration harmonic injection and mode- locking in which THz QCLs are modulated at the harmonics of the round-trip frequency. This generates multiple THz pulses per round trip in both active and self-starting harmonic regimes. This behaviour is supported by time-resolved Maxwell-Bloch simulations of induced gain and loss in the system. This work exploits the inherent ultrafast dynamics of QCLs and opens up new avenues in THz pulse generation.
11827-8
Author(s): David Burghoff, Univ. of Notre Dame (United States)
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In certain lasers, including terahertz quantum cascade lasers, frequency combs can form whose output is frequency-modulated (FM) linearly in time. While this result had been replicated experimentally and numerically, an analytical description had been elusive. We will discuss our recent work showing how this can be achieved. By deriving a mean-field theory for lasers analogous to the Lugiato-Lefever equation and solving it analytically with some weak assumptions, we show that it simplifies to the nonlinear Schrodinger equation with a phase potential. The phase of its solution is piecewise quadratic in time—an FM comb. Our results apply to many lasers and explains the diverse array of experimental observations. We will discuss prospects and opportunities for improving the performance of these combs.
11827-10
Author(s): Kumar Sandeep, Lovely Professional Univ. (India)
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An investigation on the generation of Terahertz (THz) radiation by two q-Gaussian laser beams with underdense plasma has been performed. The intensity gradient of the laser beams creates a transverse temperature gradient in the plasma and electrons shift from regions of high intensity to low intensity. This redistribution changes the dielectric properties of the plasma which results in cross focusing of the laser beams. The electrons experience another force at a beat frequency and produce nonlinear current density. This nonlinear current density can act as a source for coherent radiation at the THz frequency range. The nonlinear dynamics of beams have been studied by variational theory by solving the nonlinear Schrodinger wave equation (NLSE). The obtained equations for beam widths and THz radiation have been solved numerically and observed that for small values of q parameter and large values of ramp density, the cross-focusing and efficiency of THz radiation can be enhanced.
Session 3: THz Spectroscopy
11827-11
Author(s): Junichiro Kono, Rice Univ. (United States)
11827-12
Author(s): Vasileios Balos, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany); Hossam Elgabarty, Univ. Paderborn (Germany); Martin Wolf, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany); Thomas Kühne, Univ. Paderborn (Germany); Mohsen Sajadi, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany), Univ. Paderborn (Germany)
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In this work, we perform Terahertz (THz) Kerr Effect (TKE) experiments on several types of molecular liquids with dissolved iodide anions. We couple high intensity single-cycle THz pulses to the re-orientational motions of the aforementioned liquids and observe a subsequent energy transfer to the translational degrees of freedom of the ionic solutes manifesting as an increase of their translational kinetic energy. Surprisingly, this solvent-to-solute energy transfer is found to scale significantly with the particular intermolecular interactions of the liquids, being more dramatic when a hydrogen-bonding network is present. Our observations set the basis for future coherent control of chemical reactions in the liquid state, by means of THz radiation.
11827-14
Author(s): David J. Hilton, Baylor Univ. (United States)
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The Split-Florida Helix (SFH) at the National High Magnetic Field Laboratory is a next generation optics-compatible high field magnet that is capable of sustaining fields as high as 25 T. In this talk, I will discuss our recent work performing optical pump, terahertz probe characterization of both 2D systems as well as copper oxide superconductors in external magnetic fields. In this talk, I will consider the case of both quantum-confined gallium arsenide as well as transition metal dichalcogenides. In the case of gallium arsenide, the large external magnetic field reduces the magnetic length to be on the order of a few lattice constants, resulting in significant changes to the ultrafast dynamics. In bulk MoS2, the van Der Waal’s bonds between adjacent monolayers, resulting in a change in the inter-layer Auger scattering and the relaxation time after impulsive optical pumping of carriers above the indirect band gap.
11827-15
Author(s): Guzel R. Musina, A. M. Prokhorov General Physics Institute (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation); Arsenii A. Gavdush, A. M. Prokhorov General Physics Institute of the RAS (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation); Nikita V. Chernomyrdin, A. M. Prokhorov General Physics Institute (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation); Irina N. Dolganova, Institute of Solid State Physics (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation), Institute for Regenerative Medicine, I.M. Sechenov First Moscow State Medical Univ. (Russian Federation); Pavel V. Nikitin, Burdenko Neurosurgery Institute (Russian Federation); Gennady A. Komandin, A. M. Prokhorov General Physics Institute of the RAS (Russian Federation); Valery V. Tuchin, Saratov State Univ. (Russian Federation), Institute of Precision Mechanics and Control (Russian Federation); Kirill I. Zaytsev, A. M. Prokhorov General Physics Institute (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation), Institute for Regenerative Medicine, Sechenov First Moscow State Medical Univ. (Russian Federation)
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THz spectroscopy and imaging have a great potential for intraoperative diagnosis of human glioma. THz pulsed spectroscopy is applied for studying THz dielectric properties of the gelatin-embedded WHO Grades I–IV human brain gliomas ex vivo. The statistical differences between the THz optical properties of intact tissues and WHO Grade I–IV gliomas are observed, while edematous tissues and glioma responses are indistinguishable. Additionally, relaxation models of complex dielectric permittivity are applied to analyze the ex vivo THz dielectric response of human brain tissues. Thus, THz technologies show great potential in the intraoperative diagnosis of human brain tumors.
Session 4: Materials for THz Devices and Components
11827-16
Author(s): Jeeyoon Jeong, Kangwon National Univ. (Korea, Republic of); Dai-Sik Kim, Ulsan National Institute of Science and Technology (Korea, Republic of)
11827-17
Author(s): Diyar Talbayev, Tulane Univ. (United States)
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Spatial symmetries and the time-reversal symmetry determine how natural and artificial materials interact with light. The time-reversal symmetry can be broken in magnetic materials, which leads to polarization rotation via the Faraday effect. A new effect known as nonreciprocal directional anisotropy emerges when the magnetic material also lacks the spatial inversion symmetry, which results in the difference of transmitted light intensity in the forward and backward directions as measured with unpolarized light. We will consider several cases studies, including a polar magnet and artificial magneto-chiral metamaterials for the THz frequency range that exhibit this emerging phenomenology and also allow new ways of polarization control.
11827-19
Author(s): Stefano Lupi, Sapienza Univ. di Roma (Italy)
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Topological materials like 3D topological insulators, Dirac and Weyl semimetals are characterized by linearly dispersive electrons. Among many unconventional properties, they also present an intrinsic optical non linear response in particular in the terahertz region. In this talk, after a short review on the unconventional electrodynamics of topological matter, I will discuss some examples of non linear THz behavior ranging from 3D Topological insulators, to Weyl semimetals.
11827-20
Author(s): Nasir G. Bello, Semyon V. Smirnov, Amit Yadav, Edik U. Rafailov, Aston University (United Kingdom)
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This work presents the generation of pulsed THz radiation from a quantum dot photoconductive antenna (PCA) pumped at 780nm. The work investigates the output and characteristics of the generated THz from the QD PCA alongside a comparison with a commercial antenna. The QD PCA outputs significantly higher THz power at low pump powers of upto about 2mW than the commercial PCA and would therefore be suitable for any application that would require a low-pump power and a higher THz output power.
11827-21
Author(s): Vladislav E. Ulitko, Institute of Solid State Physics (Russian Federation); Gleb M. Katyba, Institute of Solid State Physics (Russian Federation); Vladimir M. Masalov, Vladimir N. Kurlov, Institute of Solid State Physics (Russian Federation); Kirill I. Zaytsev, A. M. Prokhorov General Physics Institute (Russian Federation), Bauman Moscow State Technical Univ. (Russian Federation)
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We study a new method in fabrication of THz optical components from previously studied porous three-dimensional nanostructures based on SiO2 [Optical Materials Express 10, 2100-2113 (2020)]. Porous SiO2 is represented by artificial opals [Optical Materials 49, 208–212 (2015)]. By the thermal treatment, it is able to achieve materials with different stoichiometric composition and porosity, and obtaining pre-determined physical and optical properties of thematerial. In this paper we produced the THz conical lens (axicone) by direct sedimentation of aqueous colloidal suspension of the SiO2 nanoparticles onto a shaped mold, followed by annealing and finished machining. The THz field transformation behind the axicone was studied by THz imaging system. The observed results were then compared with numerical predictions obtained by using the methods of computational electrodynamics. Finally, we discuss the potential of the described fabrication method in the THz optics.
Session 5: THz Detectors and Imaging
11827-24
Author(s): Lucy Hale, Univ. College London (United Kingdom); Polina P. Vabishchevich, Charles T. Harris, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, Sandia National Labs. (United States); Oleg Mitrofanov, Univ. College London (United Kingdom), Sandia National Labs. (United States)
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Here we present a photoconductive antenna (PCA) detector based on a novel perfectly absorbing, all-dielectric metasurface design. The metasurface consists of interconnected LT-GaAs channels, and supports degenerate electric and magnetic dipole modes that are critically coupled to the incident field. By replacing the photoconductive region in a THz PCA with this metasurface, full absorption of the optical pump beam is achieved in an ultra-thin photoconductive layer of only 160 nm. By maximizing absorption, high signal-to-noise is achieved at extremely low pump powers (below 100 μW). The saturation power is measured to be only 150 μW – an order of magnitude lower than typical PCA detectors. These highly efficient PCA detectors are applicable to a wide range of THz spectroscopy and imaging systems, particularly those where low power operation is required such as detector arrays and cryogenic environments.
11827-25
Author(s): Liang Qi, Linas Minkevičius, Andrzej Urbanowicz, Ctr. for Physical Sciences and Technology (Lithuania); Andrej Švigelj, Univ. of Ljubljana (Slovenia); Ignas Grigelionis, Irmantas Kašalynas, Ctr. for Physical Sciences and Technology (Lithuania); Janez Trontelj, Univ. of Ljubljana (Slovenia); Gintaras Valušis, Ctr. for Physical Sciences and Technology (Lithuania)
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Titanium-based microbolometers (Ti-mBs) were applied to characterize beam properties of electronic multiplier source, molecular THz laser and THz time-domain systems (THz-TDS). Ti-mBs with different antenna designs – narrow-band dipole antenna for 0.3 THz, 0.7 THz and a wide-band log-periodic antenna for 0.3-1.3 THz were employed. We have demonstrated that imaging with Ti-mBs allows for successful extraction of the beam parameters and detection of emitter lens misalignment as well as the degree of linear beam polarization in THz-TDS. Additionally, spatial filtering methods (dark-field imaging and phase imaging) were applied to testify their suitability under weak power sources.
11827-26
Author(s): Serge Bielawski, Lab. de Physique des Lasers, Atomes et Molécules (France)
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We present recent strategies allowing THz pulses to be recorded in single-shot, using chirped pulse electro-optic sampling. We show in particular that high repetition rates (typically 1-100e6 TDS traces per second) can be obtained using an association of electro-optic sampling with the so-called time-stretch technique. We also present recent results demonstrating that reaching simultaneously high bandwidth and high frequency resolution (i.e., long recordings) is possible with these single-shot systems, using a variant called called Diversity Electro-Optic Sampling (DEOS). Applications to studies of accelerator physics, THz sources, as well as single-shot Time-Domain spectroscopy will also be discussed.
Session 6: Biomedical Applications
11827-27
Author(s): Jeremie Torres, Institut d'Électronique et des Systèmes, Univ. de Montpellier (France)
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In this presentation, the detection of giant dipolar collective oscillation of proteins placed out-of-equilibrium has been performed by THz near-field spectroscopic experiments directly in aqueous solution. These results are a first step toward the detection of long range interaction between proteins and will open the way to non-chemical external control of basic cellular functions (gene expression, metabolism, mitosis,...) with brand new non-drug medical actions.
11827-29
Author(s): Guilhem Gallot, Ecole Polytechnique (France)
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Using attenuated total reflection (ATR) in the terahertz domain, we demonstrate non-invasive, non-staining real time measurements of cytoplasm leakage of live epithelial cells following cell membrane permeabilization triggered by external procedures. The origin of the contrast observed between cells and culture medium is addressed by both experimental and theoretical approaches, and gives access to permeabilization dynamics of live cells in real time. We show that terahertz modalities are very interesting compared to standard techniques such as fluorescence microscopy, since real time measurements are performed without staining nor specific sample preparation. Permeabilization using electric fields (electropermeabilization), chemicals (detergents) and light (photodynamic therapy) will be presented and discussed.
11827-30
Author(s): Luan Doan, Abhishek Singh, Vinh Q. Nguyen, Virginia Polytechnic Institute and State Univ. (United States)
Session 6: Poster Session
11827-28
Author(s): Lidor Kahana, Daniel Rozband, Ariel Univ. (Israel); Natan S. Kopeika, Yitzhak Yitzhaky, Ben-Gurion Univ. of the Negev (Israel); Amir Abramovich, Arun Ramachandra Kurup, Ariel Univ. (Israel)
Session 1: New Trends in THz Technology
11827-2
Author(s): Aydogan Ozcan, UCLA Samueli School of Engineering (United States)
Digital Forum: On-demand starting 1 August
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We introduce a physical mechanism to perform machine learning by demonstrating a Diffractive Deep Neural Network (D2NN) architecture that can all-optically implement various functions following the deep learning-based design of passive layers that work collectively. We created 3D-printed diffractive networks that implement all-optical classification of images of handwritten digits and fashion products as well as the function of an imaging lens, spectral filters and wavelength demultiplexers at terahertz part of the spectrum. This passive diffractive network framework is broadly applicable to different parts of the electromagnetic spectrum, and can perform at the speed of light various complex functions that computer-based neural networks can implement, and will find applications in all-optical image analysis, feature detection and object classification, also enabling new camera designs and optical components that perform unique tasks using diffractive optical networks.
11827-4
Author(s): Kathirvel Nallappan, Yang Cao, Guofu Xu, Hichem Guerboukha, Chahe Nerguizian, Maksim Skorobogatiy, Polytechnique Montréal (Canada)
Digital Forum: On-demand starting 1 August
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In terahertz (THz) communications, most of the research work is focused on wireless systems, while waveguide/fiber-based links have been less explored. Although wireless communications have several advantages, the fiber-based communications provide superior performance in certain short-range communication applications with complex geometrical environments. In this work, we present an in-depth experimental and numerical study of the short-range THz communications links (carrier frequency:128 GHz) that use subwavelength dielectric fibers of varying diameters (0.57-1.75 mm) and up to 10 m for information transmission (up to 6 Gbps) and define main challenges and tradeoffs in the link implementation.
Session 2: Sources of THz Radiation
11827-7
Author(s): Julien Madeo, Okinawa Institute of Science and Technology Graduate Univ. (Japan)
Digital Forum: On-demand starting 1 August
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Arrays of patch antennas have strongly contributed to the RF technology for telecommunications, thanks to their ease of fabrication and their versatility in controlling the properties of their emission such as polarization and beam shape. In the terahertz range, successful implementation of patch antennas in a monolithic platform would enable the advanced functionalities available in the RF range. However, for THz emission, creating practical devices by functionalizing electrical inputs without reducing the array optical properties is challenging. Here, we show that arrays of patch antennas coupled to plasmonic wires and embedding a QCL active region can achieve extremely low beam divergence (2°x2°), control of the polarization while keeping a high output power and single mode operation. We will discuss how the geometrical parameters of the array influence beam shaping, polarization and losses and show promising possibilities in active beam steering and polarization control.
11827-9
Author(s): Hua Li, Shanghai Institute of Microsystem and Information Technology (China); Ziping Li, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (China); Yiran Zhao, Shanghai Institute of Microsystem and Information Technology (China); Kang Zhou, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (China); Wenjian Wan, Juncheng Cao, Shanghai Institute of Microsystem and Information Technology (China)
Digital Forum: On-demand starting 1 August
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Different from the traditional terahertz spectroscopy, i.e., Fourier transform infrared and time domain spectroscopies, the dual-comb spectroscopy shows unique advantages in fast data acquisition and high spectral resolution. The electrically-pumped terahertz quantum cascade laser (QCL), showing high output power, broad frequency coverage, high beam quality, is a suitable candidate for dual-comb operation. In this work, employing the laser self-detection, we demonstrate terahertz on-chip dual-comb operation, real-time dual-comb spectroscopy, and phase locking of dual-comb lines based on a QCL platform emitting around 4.2 THz.
Session 3: THz Spectroscopy
11827-13
Author(s): Dominique Coquillat, Univ. de Montpellier (France); Emma O'Connor, Etienne V. Brouillet, Univ. of Strathclyde (United Kingdom); Yoann Meriguet, Lab. Charles Coulomb (France), Institut d'Électronique et des Systèmes, Univ. de Montpellier, CNRS (France); Cedric Bray, Lab. Charles Coulomb (France); David J. Nelson, Karen Faulds, Univ. of Strathclyde (United Kingdom); Jeremie Torres, Institut d'Électronique et des Systèmes, Univ. de Montpellier (United Kingdom); Nina Dyakonova, Lab. Charles Coulomb (France)
Digital Forum: On-demand starting 1 August
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Chlorophylls are the most abundant pigments amongst the actors of photosynthesis, however little is known about their low-energy vibrations. The investigations show a terahertz driven study of chlorophyll 𝑎 (Chl-𝑎) and chlorophyllins such as sodium magnesium (Chl-Mg-Na) and sodium copper (Chl-Cu-Na), species related to Chl-𝑎 which conserved the asymmetrical porphyrin ring. To complement the terahertz time-domain spectroscopy, Fourier transform infrared spectroscopy and surface-enhanced Raman spectroscopy were used to extend the measurements of the vibrations to the infrared region. As a result, the spectral behaviour shows well-defined, narrow vibrational bands at characteristic terahertz frequencies, revealing fingerprints specific to a given species.
Session 4: Materials for THz Devices and Components
11827-18
Author(s): Bahar Atik, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey); Emrah Dirican, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey); Oytun Demirörs, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey); Hakan Altan, Okan Esentürk, Middle East Technical Univ. (Turkey), METU MEMS Ctr. (Turkey); Mustafa Yildirim, METU MEMS Ctr. (Turkey); Tayfun Akın, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey)
Digital Forum: On-demand starting 1 August
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Microbolometer technology has proved its potential in the Infrared region and has expanded into the THz region as well. The active material of a microbolometer is typically based on VOx. Metal doped VOx films can show a better performance however these effects are not well understood in the THz region. In this study, W-doped and undoped VOx films are fabricated and then analyzed using Time-Domain THz spectroscopy. It is seen that certain phases VxOy dominate the response of the overall film for different concentration level of dopants. Understanding this dependence is key to achieving a better film for applications in the THz region.
Session 5: THz Detectors and Imaging
11827-22
Author(s): Chiko Otani, RIKEN Ctr. for Advanced Photonics (Japan); Yoshiaki Sasaki, RIKEN Ctr. for Advanced Photonics (Japan); Masafumi Ikari, RIKEN Ctr. for Advanced Photonics (Japan), Spectra Design Co.Ltd (Japan)
Digital Forum: On-demand starting 1 August
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Millimeter (MM) and Terahertz (THz) waves are transparent to many non-metallic materials and is expected to be applicable for non-destructive inspections. Especially, the radar 3D imaging technology using the semiconductor continuous wave (CW) MMW and THz sources is important because of its compactness, stability and high signal-to-noise ratio (SNR). In this presentation, we will introduce the development of a prototype of a 300 GHz walk-through body scanner for the security gates to realize the high throughput. For the actual system, we are developing the frequency-modulated continuous wave (FM-CW) imaging method around 300 GHz. We have demonstrated the 3-dimentional real-time imaging of a material hidden under cloths. In this presentation, we will demonstrate the system configuration and the current status as well as some results of the actual imaging.
11827-23
Author(s): Oytun Demirörs, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey); Bahar Atik, Emrah Dirican, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey); Hakan Altan, Okan Esentürk, Middle East Technical Univ. (Turkey), METU MEMS Ctr. (Turkey); Mustafa Yildirim, METU MEMS Ctr. (Turkey); Tayfun Akın, METU MEMS Ctr. (Turkey), Middle East Technical Univ. (Turkey)
Digital Forum: On-demand starting 1 August
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In this study, with the goal of developing efficient absorbers for in small pixel pitches the use of absorbers based on novel materials and alloys is investigated. Thin films based on metal alloys such as NiCr and TiAlV show a markedly lower absorption than the IR in this region. To improve the performance of these absorbing layers and reduce pixel pitches, the use of metasurfaces is analyzed with the goal of optimizing both the size and width of the resonant absorption. To achieve both, the use of effective media based on the mixture of dielectric materials and metals as well as perforated thin films are investigated together with unique metasurface unit cell designs.
Session 6: Biomedical Applications
11827-31
Author(s): Suzanna Freer, Cong Sui, Pavel Penchev, Stefan Dimov, Andrei Gorodetsky, Stephen M. Hanham, Liam M. Grover, Miguel Navarro-Cía, Univ. of Birmingham (United Kingdom)
Digital Forum: On-demand starting 1 August
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Terahertz hyperspectral imaging is emerging as an alternative method for medical imaging. However, translational research is still not fully realised because of fundamental (e.g. THz wavelength is significantly longer than live cells) and practical challenges (e.g. alignments). This invited contribution addresses the latter. We will show how standard material property retrieval methods fail to provide accurate biometric information of common biological samples because of misalignments (likely unavoidable in a practical scenario) and Fabry-Perot effects (unavoidable in thin samples), and we will report a hybrid methodology that resolves this problem for human bone slices.
Session 6: Poster Session
Conference Chair
Northwestern Univ. (United States)
Conference Chair
Univ. de Montpellier (France)
Program Committee
Institut d'Electronique de Microélectronique et de Nanotechnologie (France)
Program Committee
Joshua R. Freeman
Univ. of Leeds (United Kingdom)
Program Committee
NASA Goddard Space Flight Ctr. (United States)
Program Committee
Julius-Maximilians-Univ. Würzburg (Germany)
Program Committee
Kitasato Univ. (Japan)
Program Committee
Lab. Pierre Aigrain (France)
Program Committee
Univ. College London (United Kingdom)
Program Committee
Gaël Mouret
Univ. du Littoral Côte d'Opale (France)
Program Committee
Khalifa Univ. of Science, Technology and Research (United Arab Emirates)
Program Committee
Los Alamos National Lab. (United States)
Program Committee
Aston Univ. (United Kingdom)
Program Committee
Roland Teissier
Univ. de Montpellier (France)
Program Committee
Frédéric Teppe
Univ. de Montpellier (France)
Program Committee
Dmitry Turchinovich
Univ. Bielefeld (Germany)
Program Committee
Vladimir V. Vaks
Institute of Applied Physics of the RAS (Russian Federation)
Program Committee
Gintaras Valušis
Ctr. for Physical Sciences and Technology (Lithuania)
Program Committee
Istituto Nanoscienze (Italy)
Additional Information
This conference is accepting post-deadline submissions through 15 June 2021:
Post-Deadline Submission Portal
Post-deadline authors will be notified by 1 July 2021

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