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Journal articles on the topic 'Terahertz; scattering'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Wu, Yu Deng, and Guang Jun Ren. "Study of Enhanced Surface Raman Scattering on Nano-Particle in Terahertz Range." Advanced Materials Research 977 (June 2014): 108–11. http://dx.doi.org/10.4028/www.scientific.net/amr.977.108.

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Researched the surface-enhanced Raman scattering on nanoparticle in terahertz range, and proved the existence of the same phenomenon-Raman enhancements in the terahertz band. By studying the electromagnetic enhancement principle of surface-enhanced Raman scattering, proposed to using finite difference time-domain to simulate the surface-enhanced Raman scattering of nanoparticles in the terahertz irradiated. Simulation results show that the FDTD method can effectively simulate the scattering of nanoparticles in terahertz band, resulting in surface-enhanced Raman scattering from the visible and infrared bands extended to the terahertz band, and the result provides basis for terahertz waves and surface-enhanced Raman scattering the combined application.

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2

Dolganova, Irina N., Stanislav O. Yurchenko, Valeriy E. Karasik, and Vladimir P. Budak. "Peculiarity of Terahertz Waves Scattering." International Journal of High Speed Electronics and Systems 24, no. 01n02 (March 2015): 1520002. http://dx.doi.org/10.1142/s0129156415200025.

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Scattering of terahertz (THz) radiation is considered to be a significant problem for many applications, since it has often multiple character and is followed by interference effects. We present the computational results of THz propagation through scattering layers, obtained by using Monte Carlo simulation scheme of radiation transfer. Dense package of particles is considered for enhancing the influence of structure factor. Interference effects are shown to play an essential role for scattering phase function and scattering angular distribution of THz radiance.

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3

Алексеев, П. А., Б. Р. Бородин, И. А. Мустафин, А. В. Зубов, С. П. Лебедев, А. А. Лебедев, and В. Н. Трухин. "Терагерцевый ближнепольный отклик в лентах графена." Письма в журнал технической физики 46, no. 15 (2020): 29. http://dx.doi.org/10.21883/pjtf.2020.15.49745.18256.

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The experimental results of scattering and near-field interaction of a terahertz electromagnetic field with graphene ribbons near a metal probe of an atomic force microscope are reported. The amplification of a near-field terahertz scattering in ribbons is shown in comparison with unstructured graphene. The appearance of resonance peaks in the range 0.2–1.6 THz in the scattering spectra of terahertz radiation on graphene ribbons in the presence of a probe was detected, which is possibly due to the interaction of radiation with plasmons in the ribbons.

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4

Kaushik, Mayank, Brian W. H. Ng, Bernd M. Fischer, and Derek Abbott. "Terahertz scattering by dense media." Applied Physics Letters 100, no. 24 (June 11, 2012): 241110. http://dx.doi.org/10.1063/1.4720078.

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5

Zurk, Lisa M., Brian Orlowski, Dale P. Winebrenner, Eric I. Thorsos, Megan R. Leahy-Hoppa, and L. Michael Hayden. "Terahertz scattering from granular material." Journal of the Optical Society of America B 24, no. 9 (August 17, 2007): 2238. http://dx.doi.org/10.1364/josab.24.002238.

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6

He, Xiaoyong, Fangting Lin, Feng Liu, and Hao Zhang. "Investigation of Phonon Scattering on the Tunable Mechanisms of Terahertz Graphene Metamaterials." Nanomaterials 10, no. 1 (December 23, 2019): 39. http://dx.doi.org/10.3390/nano10010039.

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The influences of different kinds of phonon scatterings (i.e., acoustic (AC) phonon, impurity, and longitudinal optical (LO) phonon scatterings) on the tunable propagation properties of graphene metamaterials structures have been investigated, also including the effects of graphene pattern structures, Fermi levels, and operation frequencies. The results manifested that, at room temperature, AC phonon scattering dominated, while with the increase in temperature, the LO phonon scattering increased significantly and played a dominate role if temperature goes beyond 600 K. Due to the phonon scatterings, the resonant properties of the graphene metamaterial structure indicated an optimum value (about 0.5–0.8 eV) with the increase in Fermi level, which were different from the existing results. The results are very helpful to understand the tunable mechanisms of graphene functional devices, sensors, modulators, and antennas.

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7

YANG, Yang, Jian-Quan YAO, Jing-Shui ZHANG, and Li WANG. "Terahertz scattering on rough copper surface." Journal of Infrared and Millimeter Waves 32, no. 1 (2013): 36. http://dx.doi.org/10.3724/sp.j.1010.2013.00036.

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8

Png, Gretel M., Christophe Fumeaux, Mark R. Stringer, Robert E. Miles, and Derek Abbott. "Terahertz scattering by subwavelength cylindrical arrays." Optics Express 19, no. 11 (May 9, 2011): 10138. http://dx.doi.org/10.1364/oe.19.010138.

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9

Born, Philip, Nick Rothbart, Matthias Sperl, and Heinz-Wilhelm Hübers. "Granular structure determined by terahertz scattering." EPL (Europhysics Letters) 106, no. 4 (May 1, 2014): 48006. http://dx.doi.org/10.1209/0295-5075/106/48006.

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10

Amarasinghe, Yasith, Wei Zhang, Rui Zhang, Daniel M. Mittleman, and Jianjun Ma. "Scattering of Terahertz Waves by Snow." Journal of Infrared, Millimeter, and Terahertz Waves 41, no. 2 (December 3, 2019): 215–24. http://dx.doi.org/10.1007/s10762-019-00647-4.

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11

Petev, Mihail, NiclasWesterberg, Eleonora Rubino, Daniel Moss, Arnaud Couairon, François Légaré, Roberto Morandotti, Daniele Faccio, and Matteo Clerici. "Phase-Insensitive Scattering of Terahertz Radiation." Photonics 4, no. 4 (January 31, 2017): 7. http://dx.doi.org/10.3390/photonics4010007.

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12

Zhang, Zhuo-Cheng, Yue-Ying Wang, Xiao-Qiu-Yan Zhang, Tian-Yu Zhang, Xing-Xing Xu, Tao Zhao, Yu-Bin Gong, Yan-Yu Wei, and Min Hu. "Tip-sample interactions in terahertz scattering scanning near-field optical microscopy and its influences." Acta Physica Sinica 70, no. 24 (2021): 248703. http://dx.doi.org/10.7498/aps.70.20211715.

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Terahertz scattering scanning near-field optical microscopy (s-SNOM), as an important means to break through the limits of conventional optical diffraction, can achieve super-resolution imaging on a nanoscale and has a wide range of applications in biological nano-imaging, terahertz nano-spectroscopy, nanomaterials imaging, and the study of polarized excitations. As an important component of the terahertz s-SNOM, the atomic force microscope tip plays a key role in implementing the near-field excitation, detection, and enhancement. However, the tip-sample interaction can greatly affect the results. In this paper, the effects of tip-sample interaction on near-field excitation, near-field detection, and terahertz near-field spectrum in terahertz s-SNOM are revealed through simulations and experiments. First, the wave vector coupling weight of the near field excited by the tip is investigated, and it is found that the wave vector is concentrated mainly on the order of 10<sup>5</sup> cm<sup>–1</sup>, which differs from that of the general terahertz excitations by 2 to 3 orders of magnitude, indicating that the terahertz near field is difficult to excite terahertz excitations. Secondly, through theoretical and experimental studies, it is found that the metal tip interferes with the surface near-field of the graphene disk structure, which indicates the limitations of the terahertz s-SNOM in probing the near-field distribution of the structure. Finally, the influence of the tip on the near-field spectrum is studied. It is found that the tip length and cantilever length are important parameters affecting the near-field spectrum, and the influence of the tip on the near-field spectrum can be reduced by increasing the tip length or cantilever length.

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13

Васильев, Ю. Б., С. Н. Новиков, С. Н. Данилов, and С. Д. Ганичев. "Терагерцовая фотопроводимость в графене в магнитном поле." Физика и техника полупроводников 54, no. 4 (2020): 388. http://dx.doi.org/10.21883/ftp.2020.04.49146.9322.

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Abstract The terahertz photoconductivity in epitaxial graphene grown on SiC substrates is investigated in a magnetic field. The magnetic-field dependence of the photoresponse signal amplitude is examined at different electron densities, bias currents, and terahertz radiation intensities. The experimental results are explained well by a photoconductivity mechanism based on the heating of electrons by terahertz radiation. A strong increase in the photoconductivity signal with increasing magnetic field caused by an increase in the relaxation time due to the suppression of electron-electron scattering is observed.

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14

Trukhin, Valeriy N., Nikolay N. Zinov’ev, Aleksandr V. Andrianov, Leonid L. Samoilov, Aleksandr O. Golubok, Mikhail L. Felshtyn, Ivan D. Sapozhnikov, Viktor A. Bykov, and Aleksandr V. Trukhin. "Terahertz Coherent Scanning Probe Microscope." Siberian Journal of Physics 5, no. 4 (December 1, 2010): 151–53. http://dx.doi.org/10.54362/1818-7919-2010-5-4-151-153.

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We present the terahertz (THz) scanning probe microscope which combines a THz coherent spectrometer and a scanning probe microscope. It detects forward-scattered radiation and employs harmonic signal demodulation to extract the signal of near-field contribution to scattering of THz electromagnetic waves

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15

Schoenhuber, S., M. Wenclawiak, M. A. Kainz, B. Limbacher, A. M. Andrews, H. Detz, G. Strasser, J. Darmo, and K. Unterrainer. "Scattering strength dependence of terahertz random lasers." Journal of Applied Physics 125, no. 15 (April 21, 2019): 151611. http://dx.doi.org/10.1063/1.5083699.

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16

Schecklman, Scott, Lisa M. Zurk, Samuel Henry, and Gabriel P. Kniffin. "Terahertz material detection from diffuse surface scattering." Journal of Applied Physics 109, no. 9 (May 2011): 094902. http://dx.doi.org/10.1063/1.3561806.

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17

Heshmat, Barmak, Gordon Moseley Andrews, Oscar A. Naranjo-Montoya, Enrique Castro-Camus, Davide Ciceri, Albert Redo Sanchez, Antoine Allanore, et al. "Terahertz scattering and water absorption for porosimetry." Optics Express 25, no. 22 (October 24, 2017): 27370. http://dx.doi.org/10.1364/oe.25.027370.

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18

Lee, Andrew J., David J. Spence, and Helen M. Pask. "Terahertz sources based on stimulated polariton scattering." Progress in Quantum Electronics 71 (May 2020): 100254. http://dx.doi.org/10.1016/j.pquantelec.2020.100254.

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19

Pearce, Jeremy, and Daniel M. Mittleman. "Using terahertz pulses to study light scattering." Physica B: Condensed Matter 338, no. 1-4 (October 2003): 92–96. http://dx.doi.org/10.1016/s0921-4526(03)00467-8.

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20

Zurk, Lisa M., Brian Orlowski, Dale P. Winebrenner, Eric I. Thorsos, Megan R. Leahy-Hoppa, and L. Michael Hayden. "Terahertz scattering from granular material: publisher's note." Journal of the Optical Society of America B 24, no. 11 (October 31, 2007): 2906. http://dx.doi.org/10.1364/josab.24.002906.

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21

Ren, Liqing, Ilan Hurwitz, Dekel Raanan, Patric Oulevey, Dan Oron, and Yaron Silberberg. "Terahertz coherent anti-Stokes Raman scattering microscopy." Optica 6, no. 1 (January 9, 2019): 52. http://dx.doi.org/10.1364/optica.6.000052.

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22

Neeraj, Kumar, Apoorva Sharma, Maria Almeida, Patrick Matthes, Fabian Samad, Georgeta Salvan, Olav Hellwig, and Stefano Bonetti. "Terahertz charge and spin transport in metallic ferromagnets: The role of crystalline and magnetic order." Applied Physics Letters 120, no. 10 (March 7, 2022): 102406. http://dx.doi.org/10.1063/5.0067443.

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We study the charge and spin dependent scattering in a set of CoFeB thin films whose crystalline order is systematically enhanced and controlled by annealing at increasingly higher temperatures. Terahertz conductivity measurements reveal that charge transport closely follows the development of the crystalline phase, with the increasing structural order leading to higher conductivity. The terahertz-induced ultrafast demagnetization, driven by spin-flip scattering mediated by the spin–orbit interaction, is measurable in the pristine amorphous sample and much reduced in the sample with the highest crystalline order. Surprisingly, the largest demagnetization is observed at intermediate annealing temperatures, where the enhancement in spin-flip probability is not associated with an increased charge scattering. We are able to correlate the demagnetization amplitude with the magnitude of the in-plane magnetic anisotropy, which we characterize independently, suggesting a magnetoresistance-like description of the phenomenon.

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23

Kumar, Abhishek, Manoj Gupta, Prakash Pitchappa, Nan Wang, Masayuki Fujita, and Ranjan Singh. "Terahertz topological photonic integrated circuits for 6G and beyond: A Perspective." Journal of Applied Physics 132, no. 14 (October 14, 2022): 140901. http://dx.doi.org/10.1063/5.0099423.

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The development of terahertz integrated circuits is vital for realizing sixth-generation (6G) wireless communication, high-speed on-chip interconnects, high-resolution imaging, on-chip biosensors, and fingerprint chemical detection. Nonetheless, the existing terahertz on-chip devices suffer from reflection, and scattering losses at sharp bends or defects. Recently discovered topological phases of light endow the photonics devices with extraordinary properties, such as reflectionless propagation and robustness against impurities or defects, which is vital for terahertz integrated devices. Leveraging the robustness of topological edge states combined with a low-loss silicon platform is poised to offer a remarkable performance of the terahertz devices providing a breakthrough in the field of terahertz integrated circuits and high-speed interconnects. In this Perspective, we present a brief outlook of various terahertz functional devices enabled by a photonic topological insulator that will pave the path for augmentation of complementary metal oxide semiconductor compatible terahertz technologies, essential for accelerating the vision of 6G communication and beyond to enable ubiquitous connectivity and massive digital cloning of physical and biological worlds.

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24

Kojima, Seiji. "Broadband Terahertz Spectroscopy of Phonon-Polariton Dispersion in Ferroelectrics." Photonics 5, no. 4 (December 3, 2018): 55. http://dx.doi.org/10.3390/photonics5040055.

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Electromagnetic waves at frequencies below the X-ray region strongly couple to the optical vibrational modes in a solid. These coupled excitations have been called phonon polaritons. The relationship of the polariton frequency versus the polariton wavevector shows a remarkable dispersion, especially in the vicinity of the transverse and longitudinal optical mode frequencies. The significant frequency dependence enables valuable applications such as a tunable terahertz radiation source. The polariton dispersion relations of technologically important dielectric and ferroelectric crystals were reviewed in the broad terahertz range using terahertz time-domain spectroscopy, far-infrared spectroscopy, and Raman scattering spectroscopy.

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25

Shih, Yi-Hong, Harry Miyosi Silalahi, Ting-I. Tsai, Yi-Chen Chen, Jou-Yu Su, Chia-Rong Lee, and Chia-Yi Huang. "Optically Tunable and Thermally Erasable Terahertz Intensity Modulators Using Dye-Doped Liquid Crystal Cells with Metasurfaces." Crystals 11, no. 12 (December 18, 2021): 1580. http://dx.doi.org/10.3390/cryst11121580.

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A terahertz metasurface that is imbedded into a dye-doped liquid crystal (DDLC) cell is fabricated in this work. After the metasurface-imbedded DDLC cell is irradiated with a linearly polarized pump beam, the irradiated cell is measured with a terahertz spectrometer. The irradiation of the pump beam causes the adsorption of the dye on one of the substrates of the cell, scattering incident terahertz waves and decreasing the transmittances of the terahertz metasurface at all the frequencies of its resonance spectrum. In addition, these transmittances decrease with an increase in the irradiation times of the pump beam. The adsorbed dye molecules are erased from the substrate after the cell is heated by a hot plate. The cell has similar spectra before the irradiation of the pump beam and after the heating of the hot plate. The aforementioned results reveal that the metasurface-imbedded DDLC cell is an optically tunable and thermally erasable terahertz intensity modulator. Therefore, this cell has the potential in developing intensity attenuators for terahertz imaging, frequency isolators for terahertz telecommunication, and spatial light modulators for terahertz information encryption and decryption.

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26

Жукавин, Р. Х., К. А. Ковалевский, С. Г. Павлов, N. Deb mann, A. Pohl, В. В. Цыпленков, Н. В. Абросимов, H. Riemann, H. W. Hubers, and В. Н. Шастин. "Перестройка спектра терагерцового стимулированного излучения при внутрицентровом оптическом возбуждении одноосно-деформированного Si : Bi." Физика и техника полупроводников 54, no. 8 (2020): 816. http://dx.doi.org/10.21883/ftp.2020.08.49632.09.

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The results of experimental and theoretical investigations dedicated to the uniaxial stress induced tuning of terahertz stimulated terahertz emission from silicon doped with bismuth under optical intracenter excitation. The frequency tuning of two emission lines from bismuth donor in silicon under uniaxial stress along [001] has been demonstrated in the experiments. The crosssections of stimulated Raman scattering for uniaxially stressed silicon doped with bismuth donors have been calculated.

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27

Gao, Liang, John L. Reno, and Sushil Kumar. "Short Barriers for Lowering Current-Density in Terahertz Quantum Cascade Lasers." Photonics 7, no. 1 (January 8, 2020): 7. http://dx.doi.org/10.3390/photonics7010007.

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Scattering due to interface-roughness (IR) and longitudinal-optical (LO) phonons are primary transport mechanisms in terahertz quantum-cascade lasers (QCLs). By choosing GaAs/Al0.10Ga0.90As heterostructures with short-barriers, the effect of IR scattering is mitigated, leading to low operating current-densities. A series of resonant-phonon terahertz QCLs developed over time, achieving some of the lowest threshold and peak current-densities among published terahertz QCLs with maximum operating temperatures above 100 K. The best result is obtained for a three-well 3.1 THz QCL with threshold and peak current-densities of 134 A/cm2 and 208 A/cm2 respectively at 53 K, and a maximum lasing temperature of 135 K. Another three-well QCL designed for broadband bidirectional operation achieved lasing in a combined frequency range of 3.1–3.7 THz operating under both positive and negative polarities, with an operating current-density range of 167–322 A/cm2 at 53 K and maximum lasing temperature of 141 K or 121 K depending on the polarity of the applied bias. By showing results from QCLs developed over a period of time, here we show conclusively that short-barrier terahertz QCLs are effective in achieving low current-density operation at the cost of a reduction in peak temperature performance.

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28

Li, Ming, Husi Letu, Hiroshi Ishimoto, Shulei Li, Lei Liu, Takashi Y. Nakajima, Dabin Ji, Huazhe Shang, and Chong Shi. "Retrieval of terahertz ice cloud properties from airborne measurements based on the irregularly shaped Voronoi ice scattering models." Atmospheric Measurement Techniques 16, no. 2 (January 24, 2023): 331–53. http://dx.doi.org/10.5194/amt-16-331-2023.

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Abstract. Currently, terahertz remote sensing technology is one of the best ways to detect the microphysical properties of ice clouds. Influenced by the representativeness of the ice crystal scattering (ICS) model, the existing terahertz ice cloud remote sensing inversion algorithms still have significant uncertainties. In this study, based on the Voronoi ICS model, we developed a terahertz remote sensing inversion algorithm of the ice water path (IWP) and median mass diameter (Dme) of ice clouds. This study utilized the single-scattering properties (extinction efficiency, single-scattering albedo, and asymmetry factor) of the Voronoi, sphere, and hexagonal column ICS models in the terahertz region. Combined with 14 408 groups of particle size distributions obtained from aircraft-based measurements, we developed the Voronoi, sphere, and column ICS schemes based on the Voronoi, sphere, and column ICS models. The three schemes were applied to the radiative transfer model to carry out the sensitivity analysis of the top-of-cloud (TOC) terahertz brightness temperature differences between cloudy and clear skies (BTDs) on the IWP and Dme. The sensitivity results showed that the TOC BTDs between 640 and 874 GHz are functions of the IWP, and the TOC BTDs of 380, 640, and 874 GHz are functions of the Dme. The Voronoi ICS scheme possesses stronger sensitivity to the Dme than the sphere and column ICS schemes. Based on the sensitivity results, we built a multi-channel look-up table for BTDs. The IWP and Dme were searched from the look-up table using an optimal estimation algorithm. We used 2000 BTD test data randomly generated by the RSTAR model to assess the algorithm's accuracy. Test results showed that the correlation coefficients of the retrieved IWP and Dme reached 0.99 and 0.98, respectively. As an application, we used the inversion algorithm to retrieve the ice cloud IWP and Dme based on the Compact Scanning Submillimeter-wave Imaging Radiometer (CoSSIR) airborne terahertz radiation measurements. Validation against the retrievals of the Bayesian algorithm reveals that the Voronoi ICS model performs better than the sphere and hexagonal column ICS models, with enhancement of the mean absolute errors of 5.0 % and 12.8 % for IWP and Dme, respectively. In summary, the results of this study confirmed the practicality and effectiveness of the Voronoi ICS model in the terahertz remote sensing inversion of ice cloud microphysical properties.

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29

Dong, Chengang, Wei Shi, Fei Xue, and Yuhua Hang. "Multi-Energy Valley Scattering Characteristics for a SI-GaAs-Based Terahertz Photoconductive Antenna in Linear Mode." Applied Sciences 10, no. 1 (December 18, 2019): 7. http://dx.doi.org/10.3390/app10010007.

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In this paper, the relationship between the terahertz radiation and the spatial distribution of photogenerated carriers under different bias electric field is studied. Terahertz pulses and the photocurrent of SI-GaAs photoconductive antenna are measured by the terahertz time-domain spectroscopy system. The occupancy rate for photogenerated carriers for different energy valleys is obtained by comparing the photocurrent of terahertz field integrating with respect to time with the photocurrent measured by oscilloscope. Results indicate that 93.04% of all photogenerated carriers are located in the Γ valley when the bias electric field is 3.33 kV/cm, and 68.6% of all photogenerated carriers are transferred to the satellite valley when the bias electric field is 20.00 kV/cm. With the bias electric field increasing, the carrier occupancy rate for the satellite valley tends to saturate at 72.16%. In order to obtain the carrier occupancy rate for the satellite valley and saturate value at the high bias electric field, an ensemble Monte Carlo simulation based on the theory of photo-activated charge domain is developed.

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30

Shamparov, Eugene Yu, Anatoly L. Bugrimov, Sergey V. Rode, and Inna N. Zhagrina. "TERAHERTZ MEASUREMENTS OF SCATTERING AND ABSORBING STRUCTURE CHARACTERISTICS." Bulletin of the Moscow State Regional University (Physics and Mathematics), no. 3 (2021): 57–69. http://dx.doi.org/10.18384/2310-7251-2021-3-57-69.

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31

Kostina, V. L., Yu I. Malyshenko, and A. N. Roenko. "MILLIMETER AND TERAHERTZ WAVE SCATTERING DIAGRAMS IN RAINS." Telecommunications and Radio Engineering 74, no. 13 (2015): 1157–66. http://dx.doi.org/10.1615/telecomradeng.v74.i13.30.

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32

Zhang Yin, Feng Yi-Jun, Jiang Tian, Cao Jie, Zhao Jun-Ming, and Zhu Bo. "Graphene based tunable metasurface for terahertz scattering manipulation." Acta Physica Sinica 66, no. 20 (2017): 204101. http://dx.doi.org/10.7498/aps.66.204101.

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33

Kaushik, Mayank, Brian W. H. Ng, Bernd M. Fischer, and Derek Abbott. "Terahertz fingerprinting in presence of quasi-ballistic scattering." Applied Physics Letters 101, no. 6 (August 6, 2012): 061108. http://dx.doi.org/10.1063/1.4745182.

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34

Zhong, X. J., T. J. Cui, Z. Li, Y. B. Tao, and H. Lin. "Terahertz-wave Scattering by Perfectly Electrical Conducting Objects." Journal of Electromagnetic Waves and Applications 21, no. 15 (January 1, 2007): 2331–40. http://dx.doi.org/10.1163/156939307783134443.

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35

Zybell, S., J. Bhattacharyya, S. Winnerl, F. Eßer, M. Helm, H. Schneider, L. Schneebeli, et al. "Characterizing intra-exciton Coulomb scattering in terahertz excitations." Applied Physics Letters 105, no. 20 (November 17, 2014): 201109. http://dx.doi.org/10.1063/1.4902431.

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36

Monnai, Yasuaki, Kristian Altmann, Christian Jansen, Martin Koch, Hartmut Hillmer, and Hiroyuki Shinoda. "Terahertz beam focusing based on plasmonic waveguide scattering." Applied Physics Letters 101, no. 15 (October 8, 2012): 151116. http://dx.doi.org/10.1063/1.4759042.

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37

Siday, Thomas, Michele Natrella, Jiang Wu, Huiyun Liu, and Oleg Mitrofanov. "Resonant terahertz probes for near-field scattering microscopy." Optics Express 25, no. 22 (October 27, 2017): 27874. http://dx.doi.org/10.1364/oe.25.027874.

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38

Kostina, V., Yu Malyshenko, and A. Roenko. "Millimeter and terahertz wave scattering diagrams in rains." RADIOFIZIKA I ELEKTRONIKA 20, no. 1 (March 10, 2015): 26–31. http://dx.doi.org/10.15407/rej2015.01.026.

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39

Su, F. H., F. Blanchard, G. Sharma, L. Razzari, A. Ayesheshim, T. L. Cocker, L. V. Titova, et al. "Terahertz pulse induced intervalley scattering in photoexcited GaAs." Optics Express 17, no. 12 (May 22, 2009): 9620. http://dx.doi.org/10.1364/oe.17.009620.

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40

Chen, Y. Y., A. G. Xie, F. Gu, Q. H. Wang, and Z. H. Li. "Scattering of terahertz wave by charged spherical particles." Indian Journal of Physics 89, no. 3 (July 17, 2014): 299–305. http://dx.doi.org/10.1007/s12648-014-0540-4.

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Zhao, Jie, Qiang Cheng, Xin Ke Wang, Min Jie Yuan, Xiao Zhou, Xiao Jian Fu, Mei Qing Qi, et al. "Controlling the Bandwidth of Terahertz Low-Scattering Metasurfaces." Advanced Optical Materials 4, no. 11 (July 11, 2016): 1773–79. http://dx.doi.org/10.1002/adom.201600202.

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Wiecha, Matthias M., Rohit Kapoor, Alexander V. Chernyadiev, Kęstutis Ikamas, Alvydas Lisauskas, and Hartmut G. Roskos. "Antenna-coupled field-effect transistors as detectors for terahertz near-field microscopy." Nanoscale Advances 3, no. 6 (2021): 1717–24. http://dx.doi.org/10.1039/d0na00928h.

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We report the successful implementation of antenna-coupled terahertz field-effect transistors (TeraFETs) as homodyne detectors in a scattering-type scanning near-field optical microscope (s-SNOM) operating with radiation at 246.5 GHz.

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43

Lynch, Scott T., Alessio De Francesco, Luisa Scaccia, and Alessandro Cunsolo. "Controlling terahertz sound propagation: some preliminary Inelastic X-Ray Scattering result." EPJ Web of Conferences 272 (2022): 01010. http://dx.doi.org/10.1051/epjconf/202227201010.

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The control of sound propagation in materials via the design of their elastic properties is an exciting task at the forefront of Condensed Matter. It becomes especially compelling at terahertz frequencies, where phonons are the primary conveyors of heat flow. Despite the increasing focus on this goal, this field of research is still in its infancy; To achieve a few advances in this field, we performed several Inelastic X-Ray Scattering (IXS) measurements on elementary systems as dilute suspensions of nanoparticles (NPs) in liquids. We found that nanoparticles can effectively impact the sound propagation of the hosting liquid. We also explored the possibility of shaping terahertz sound propagation in a liquid upon confinement on quasi-unidimensional cavities. These results are here reviewed and discussed, and future research directions are finally outlined.

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Chiariello, Andrea G., Carlo Forestiere, Antonio Maffucci, and Giovanni Miano. "Scattering properties of carbon nanotube arrays." International Journal of Microwave and Wireless Technologies 2, no. 5 (October 2010): 445–52. http://dx.doi.org/10.1017/s1759078710000620.

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In this paper, we investigate the scattering properties of an array of finite-length single-walled carbon nanotubes (SWCNTs), up to terahertz frequencies. The problem is cast in terms of a Pocklington-like equation. The current density along the CNT is described by a quasi-classical transport model, recently proposed. The numerical solution is obtained by means of the Galerkin method. Case studies are carried out, either referred to isolated SWCNTs and an array of SWCNTs, aimed at investigating the frequency behavior of the scattered field.

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Sabery, Shahrzad Minooee, Aleksandr Bystrov, Miguel Navarro-Cía, Peter Gardner, and Marina Gashinova. "Study of Low Terahertz Radar Signal Backscattering for Surface Identification." Sensors 21, no. 9 (April 23, 2021): 2954. http://dx.doi.org/10.3390/s21092954.

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This study explores the scattering of signals within the mm and low Terahertz frequency range, represented by frequencies 79 GHz, 150 GHz, 300 GHz, and 670 GHz, from surfaces with different roughness, to demonstrate advantages of low THz radar for surface discrimination for automotive sensing. The responses of four test surfaces of different roughness were measured and their normalized radar cross sections were estimated as a function of grazing angle and polarization. The Fraunhofer criterion was used as a guideline for determining the type of backscattering (specular and diffuse). The proposed experimental technique provides high accuracy of backscattering coefficient measurement depending on the frequency of the signal, polarization, and grazing angle. An empirical scattering model was used to provide a reference. To compare theoretical and experimental results of the signal scattering on test surfaces, the permittivity of sandpaper has been measured using time-domain spectroscopy. It was shown that the empirical methods for diffuse radar signal scattering developed for lower radar frequencies can be extended for the low THz range with sufficient accuracy. The results obtained will provide reference information for creating remote surface identification systems for automotive use, which will be of particular advantage in surface classification, object classification, and path determination in autonomous automotive vehicle operation.

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De Francesco, Alessio, Luisa Scaccia, Ferdinando Formisano, Eleonora Guarini, Ubaldo Bafile, Marco Maccarini, Ahmet Alatas, Yong Q. Cai, and Alessandro Cunsolo. "The Terahertz Dynamics of an Aqueous Nanoparticle Suspension: An Inelastic X-ray Scattering Study." Nanomaterials 10, no. 5 (April 29, 2020): 860. http://dx.doi.org/10.3390/nano10050860.

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We used the high-resolution Inelastic X-ray Scattering beamline of the Advanced Photon Source at Argonne National Laboratory to measure the terahertz spectrum of pure water and a dilute aqueous suspension of 15 nm diameter spherical Au nanoparticles (Au-NPs). We observe that, despite their sparse volume concentration of about 0.5%, the immersed NPs strongly influence the collective molecular dynamics of the hosting liquid. We investigate this effect through a Bayesian inference analysis of the spectral lineshape, which elucidates how terahertz transport properties of water change upon Au-NP immersion. In particular, we observe a nearly complete disappearance of the longitudinal acoustic mode and a mildly decreased ability to support shear wave propagation.

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Wang, Qi, Yue Wang, Yu Lin He, Wen Chao Zhang, and Xuan Wang. "The Design and Characterization of Three-Dimension Metamaterial for Terahertz Frequencies." Advanced Materials Research 981 (July 2014): 846–50. http://dx.doi.org/10.4028/www.scientific.net/amr.981.846.

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We present the design and characterization of a three-dimension metamaterial consisted of a Jerusalem cross unit cell on the each side of cube lattice substrate for terahertz frequencies. The retrieved effective medium parameters from scattering data prove that the three-dimension metamaterial has a negative permeability and permittivity in wide frequencies range of 1.47-1.73 THz. We demonstrate that the three-dimension can be regarded as a polarization insensitive absorber with an absorptivity of 46% at 1.49 THz. Such designed materials may find numerous applications ranging from the active element in a thermal detector to terahertz stealth technology.

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Melentev, G. A., N. A. Kostromin, M. Ya Vinnichenko, D. A. Firsov, and H. A. Sarkisyan. "Electron heating in GaN/AlGaN quantum well in a longitudinal electric field." Journal of Physics: Conference Series 2227, no. 1 (March 1, 2022): 012011. http://dx.doi.org/10.1088/1742-6596/2227/1/012011.

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Abstract The heating of electrons under longitudinal optical phonon scattering in a triangular GaN/AlGaN quantum well was studied theoretically. The energy loss rate of electrons was calculated in consideration of the dynamical screening and the hot phonon effect. The dependence of the electron temperature on the longitudinal electric field was calculated. The integral terahertz emission of hot two-dimensional electrons was simulated. The role of coupled plasmon-phonon mode scattering in the GaN/AlGaN quantum well was discussed.

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Miyoshi, Teppei, and Dayan Ban. "Investigation of Coulomb scattering in terahertz quantum cascade lasers." Journal of Applied Physics 129, no. 15 (April 21, 2021): 153102. http://dx.doi.org/10.1063/5.0041392.

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Shi Jie, 史. 杰., 钟. 凯. Zhong Kai, 刘. 楚. Liu Chu, 王茂榕 Wang Maorong, 乔鸿展 Qiao Hongzhan, 李吉宁 Li Jining, 徐德刚 Xu Degang, and 姚建铨 Yao Jianquan. "Scattering properties of rough metal surface in terahertz region." Infrared and Laser Engineering 47, no. 12 (2018): 1217004. http://dx.doi.org/10.3788/irla201847.1217004.

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