Academic literature on the topic 'Terahertz (THz) Bands'

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Journal articles on the topic "Terahertz (THz) Bands"

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Xu, Yikai. "Advances in CODE V design in terahertz imaging system." Advances in Engineering Technology Research 6, no. 1 (2023): 533. http://dx.doi.org/10.56028/aetr.6.1.533.2023.

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The band of terahertz (THz) spans from microwave to infrared bands, which belongs to the transition band from macro-electronics to micro-photonics, possessing peculiarities different from electromagnetic waves in other bands. THz technology with the characteristics of high penetration, broadband, high resolution and transient are employed in various fields, such as space remote sensing, nondestructive detection biomedical imaging and near-field microscopy. These broad applications, in turn, provide incentive to further improve the basic performance of THz technology. Aiming at the application
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Chen, Yinwei, Feifei Qin, Lijuan Liu, et al. "0.4 THz Broadband Terahertz Noise Source Based on Photoconductive Antennas." Photonics 12, no. 3 (2025): 252. https://doi.org/10.3390/photonics12030252.

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Terahertz noise sources have important application prospects in noise figure measurements. In this paper, a 0.4 THz broadband terahertz noise source based on a photoconductive antenna is proposed. As a demonstration of feasibility, this terahertz noise source is generated by mixing three beams of Gaussian-shaped incoherent light. The resulting excess noise ratio (ENR) across different frequency bands is as follows: 20.9 dB, with a flatness of ±7.9 dB in the 75~110 GHz range; 19.3 dB, with a flatness of ±6.2 dB in the 110~170 GHz range; 20.6 dB, with a flatness of ±4.8 dB in the 170~260 GHz ran
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Jiang, Ye, Fengshan Zhou, Xiaodong Wen, et al. "Terahertz Absorption Spectroscopy of Benzamide, Acrylamide, Caprolactam, Salicylamide, and Sulfanilamide in the Solid State." Journal of Spectroscopy 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/732802.

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Terahertz (THz) absorption spectra of the similarly structured molecules with amide groups including benzamide, acrylamide, caprolactam, salicylamide, and sulfanilamide in the solid phase at room temperature and 7.8 K for salicylamide are reported and compared to infrared vibrational spectral calculations using density functional theory. The results of THz absorption spectra show that the molecules have characteristic bands in the region of 0.2–2.6 THz (~7–87 cm−1). THz technique can be used to distinguish different molecules with amide groups. In the THz region benzamide has three bands at 0.
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Salonga Ponseca, Carlito Jr, Mustafa Al-Shamali, Mindaugas Karaliunas, et al. "Characterization of Kuwait Crude Oil via Terahertz Fourier Transform Spectroscopy." EPJ Web of Conferences 309 (2024): 10011. http://dx.doi.org/10.1051/epjconf/202430910011.

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We report the experimental and theoretical terahertz (THz) absorption characteristics of unprocessed crude oils from Kuwait oil wells. Using THz Fourier transform spectroscopy technique and semi-empirical computational chemistry calculation, five of the 30 crude oils revealed characteristic absorbance spectra. Experimental data showed absorption peaks at 6.0 THz, 7.7 THz, 13 THz, and 16 THz. On the other hand, the calculated spectral bands of 10 nonane molecules were found at around 2.8 THz, 7.7 THz, 10 THz, and 16 THz. Although only two bands were predicted by the calculation, adding alkane m
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Nakanishi, Atsushi, Shohei Hayashi, Hiroshi Satozono, and Kazuue Fujita. "Spectroscopic Imaging with an Ultra-Broadband (1–4 THz) Compact Terahertz Difference-Frequency Generation Source." Electronics 10, no. 3 (2021): 336. http://dx.doi.org/10.3390/electronics10030336.

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We demonstrate spectroscopic imaging using a compact ultra-broadband terahertz semiconductor source with a high-power, mid-infrared quantum cascade laser. The electrically pumped monolithic source is based on intra-cavity difference-frequency generation and can be designed to achieve an ultra-broadband multi-mode terahertz emission spectrum extending from 1–4 THz without any external optical setup. Spectroscopic imaging was performed with three frequency bands, 2.0 THz, 2.5 THz and 3.0 THz, and as a result, this imaging technique clearly identified three different tablet components (polyethyle
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Yin, Shan, Xintong Shi, Wei Huang, et al. "Two-Bit Terahertz Encoder Realized by Graphene-Based Metamaterials." Electronics 8, no. 12 (2019): 1528. http://dx.doi.org/10.3390/electronics8121528.

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Terahertz (THz) technologies have achieved great progress in the past few decades. Developing active devices to control the THz waves is the frontier of THz applications. In this paper, a new scheme of two-bit THz encoder is proposed. Different from the present THz modulators whose spectra at different bands are varied simultaneously, our encoder can realize the individually efficient modulation of every channel. The encoder comprises the double-sided graphene-based metamaterials, in which the graphene structures on each side are connected to the external electrodes individually. The well-desi
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Asif, Muhammad, Qiong Wang, Zhengbiao Ouyang, Mi Lin, and Zixian Liang. "Ultra-Wideband Terahertz Wave Absorber Using Vertically Structured IGIGIM Metasurface." Crystals 14, no. 1 (2023): 22. http://dx.doi.org/10.3390/cryst14010022.

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Achieving perfect absorption of electromagnetic waves across a wide range of frequencies is crucial for various applications, including sensing, imaging, and energy capture. In this study, we introduced a new concept for metasurfaces and proposed a six-layer vertically structured IGIGIM metasurface consisting of gold (Au), silicon (Si), graphene (G1), silica (SiO2), a second layer of graphene (G2), and polymethyl methacrylate (PMMA), which demonstrates ultra-wideband absorptance in the terahertz (THz) region. Through theoretical analysis and numerical simulations, we obtained broadband absorpt
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Ghosh, Monisha, Arindam Biswas, and Aritra Acharyya. "Terahertz Radiators Based on Si~3C-SiC MQW IMPATT Diodes." Nanoscience & Nanotechnology-Asia 10, no. 4 (2020): 501–6. http://dx.doi.org/10.2174/2210681209666190807154014.

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Aims:: The potentiality of Multiple Quantum Well (MQW) Impacts Avalanche Transit Time (IMPATT) diodes based on Si~3C-SiC heterostructures as possible terahertz radiators have been explored in this paper. Objective:: The static, high frequency and noise performance of MQW devices operating at 94, 140, and 220 GHz atmospheric window frequencies, as well as 0.30 and 0.50 THz frequency bands, have been studied in this paper. Methods: The simulation methods based on a Self-Consistent Quantum Drift-Diffusion (SCQDD) model developed by the authors have been used for the above-mentioned studies. Resul
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Wang, Qian, Yuzi Chen, Jinxian Mao, Fengyuan Yang, and Nan Wang. "Metasurface-Assisted Terahertz Sensing." Sensors 23, no. 13 (2023): 5902. http://dx.doi.org/10.3390/s23135902.

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Terahertz (THz) waves, which fall between microwaves and infrared bands, possess intriguing electromagnetic properties of non-ionizing radiation, low photon energy, being highly sensitive to weak resonances, and non-polar material penetrability. Therefore, THz waves are extremely suitable for sensing and detecting chemical, pharmaceutical, and biological molecules. However, the relatively long wavelength of THz waves (30~3000 μm) compared to the size of analytes (1~100 nm for biomolecules, <10 μm for microorganisms) constrains the development of THz-based sensors. To circumvent this problem
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Tomimura, Yuga, Akira Satou, and Tomohiro Kita. "Generation of Millimeter Waves and Sub-Terahertz Waves Using a Two-Wavelength Tunable Laser for a Terahertz Wave Transceiver." Photonics 11, no. 9 (2024): 811. http://dx.doi.org/10.3390/photonics11090811.

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As global internet traffic continues to increase, technologies for generating high-frequency signals, such as sub-terahertz (sub-THz) bands, through photonics are gaining attention. In this study, we demonstrate the generation of millimeter waves at approximately 17 GHz and sub-THz waves at approximately 300 GHz by converting the frequency difference of a two-wavelength tunable laser, fabricated using silicon photonics, into an optical–electrical signal. This device is expected to be used as a compact and low power consumption, two-wavelength tunable light source for THz wave transceivers.
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Dissertations / Theses on the topic "Terahertz (THz) Bands"

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Berenguer, Verdú Antonio José. "Analysis and design of efficient passive components for the millimeter-wave and THz bands." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/84004.

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This thesis tackles issues of particular interest regarding analysis and design of passive components at the mm-wave and Terahertz (THz) bands. Innovative analysis techniques and modeling of complex structures, design procedures, and practical implementation of advanced passive devices are presented. The first part of the thesis is dedicated to THz passive components. These days, THz technology suffers from the lack of suitable waveguiding structures since both, metals and dielectric, are lossy at THz frequencies. This implies that neither conventional closed metallic structures used at micr
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Molis, Gediminas. "Investigation of the terahertz pulse generation from the narrow band gap semiconductor surfaces." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100623_093655-47390.

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Generation of terahertz radiation from semiconductor surfaces has great potential for investigation of physical properties of semiconductors. This work focuses on the semiconductor research when generating terahertz pulses from a variety of semiconductor surfaces. THz radiation from semiconductor surfaces can be generated on a whole range of physical mechanisms: the surface field screening, photo-Dember effect, the optical rectification, electric field induced optical rectification, plasma oscillations, coherent phonons and plasmons. A number of important semiconductor parameters such as refra
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Jornet, Montana Josep Miquel. "Fundamentals of electromagnetic nanonetworks in the terahertz band." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50233.

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Nanotechnology is providing a new set of tools to the engineering community to design nanoscale components with unprecedented functionalities. The integration of several nano-components into a single entity will enable the development of advanced nanomachines. Nanonetworks, i.e., networks of nanomachines, will enable a plethora of applications in the biomedical, environmental, industrial and military fields. To date, it is still not clear how nanomachines will communicate. The miniaturization of a classical antenna to meet the size requirements of nanomachines would impose the use of very high
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Hawecker, Jacques. "Terahertz time resolved spectroscopy of Intersubband Polaritons and Spintronic Emitters." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS101.

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Le domaine térahertz (THz) inclut une riche variété d’applications pratiques et fondamentales où la basse énergie des photons permettent l’investigation de nouveaux phénomènes d’interaction lumière-matière. Ces travaux se focalisent sur deux thématiques émergentes où la spectroscopie THz ultra-rapide représente un outil particulièrement adapté à l’étude de phénomènes fondamentaux ainsi qu’à la conception de nouvelles sources THz. La première thématique concerne la spintronique THz capable de générer des ondes THz équivalentes à celles obtenues au sein des cristaux non-linéaires. Cette technolo
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Han, Chong. "Physical layer solutions for ultra-broadband wireless communications in the terahertz band." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54965.

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In recent years, the wireless data traffic grew exponentially, which was further accompanied by an increasing demand for higher data rates. Towards this aim, Terahertz band (0.1-10 THz) communication is envisioned as one of the key wireless technologies of the next decade. The THz band will help to overcome the spectrum scarcity problems and capacity limitations of current wireless networks, by providing an unprecedentedly large bandwidth. In addition, THz band communication will enable a plethora of long-awaited applications ranging from instantaneous massive data transfer among nearby device
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Khairuzzaman, Md. "Digitally selected electronically switchable terahertz-over-fibre." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/digitally-selected-electronically-switchable-terahertzoverfibre(7003c9cb-fa46-4933-9348-b1977a446b7f).html.

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The Quantum Cascade Laser (QCL)-based terahertz-over-fibre (ToF) concept combines the strength of QCLs as ultra-wide bandwidth, high speed data sources, with the mature optical fibre technology. In this thesis, for the first time, by fusing multiple technologies, digitally selected, electronically-switchable ToF concept is experimentally demonstrated. Furthermore, the digital mode selection principle and electronic tuning mechanism provided by novel aperiodic distributed feedback (ADFB) multi-band filters are presented. For the development of electronically tunable ADFB lasers, a range of boun
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Bockelt, Alexander Stefan. "Fiber-based Terahertz Time-Domain Spectroscopy Systems Operated in the Telecom Band." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/86148.

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The aim of the doctoral thesis is the study of Terahertz time domain spectrometers relying on telecommunication fiber technology. Optical fiber offers low losses, high stability and compactness, features that ease the deployment of this kind of sensing instruments in industrial scenarios. The development of terahertz signal sources working at telecom wavelengths has enabled the employment of mature, telecom-related photonic components that allowed a transition within THz research from being mainly object of scientific interest to an application-oriented technology. In this thesis, fiber terahe
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Lezier, Geoffrey. "Nouvelles sources rapides THz exploitant les émetteurs large bande à effet Spin Hall inverse : nouveaux modes de contrôle des Émetteurs THz Spintroniques." Electronic Thesis or Diss., Centrale Lille Institut, 2024. https://theses.hal.science/tel-05000449.

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Les émetteurs spintroniques THz sont des dispositifs particulièrement prometteurs pour combler le "gap THz", et possèdent de nombreuses propriétés qui permettent de facilement contrôler la polarisation d’émission. Une nouvelle configuration magnétique à anisotropie uniaxiale est développée, et permet le contrôle de la polarisation par champs scalaires sur 360°. Cette même configuration, couplée à un substrat piézoélectrique,permet un contrôle magnéto-électrique des dispositifs, par l’application d’un champ électrique. De plus, le contrôle dynamique est établi par modulation de la polarisation
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Regensburger, Stefan [Verfasser], Sascha [Akademischer Betreuer] Preu, and Hartmut [Akademischer Betreuer] Roskos. "Large-area and lumped element field-effect transistors for picosecond-scale detection in the Terahertz band and beyond / Stefan Regensburger ; Sascha Preu, Hartmut Roskos." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1199006505/34.

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Regensburger, Stefan [Verfasser], Sascha Akademischer Betreuer] Preu, and Hartmut [Akademischer Betreuer] [Roskos. "Large-area and lumped element field-effect transistors for picosecond-scale detection in the Terahertz band and beyond / Stefan Regensburger ; Sascha Preu, Hartmut Roskos." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1199006505/34.

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Books on the topic "Terahertz (THz) Bands"

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Rappaport, Theodore S., Kate A. Remley, Camillo Gentile, Andreas F. Molisch, and Alenka Zajić, eds. Radio Propagation Measurements and Channel Modeling: Best Practices for Millimeter-Wave and Sub-Terahertz Frequencies. Cambridge University Press, 2022. http://dx.doi.org/10.1017/9781009122740.

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This book offers comprehensive, practical guidance on RF propagation channel characterization at mmWave and sub-terahertz frequencies, with an overview of both measurement systems and current and future channel models. It introduces the key concepts required for performing accurate mmWave channel measurements, including channel sounder architectures, calibration methods, channel sounder performance metrics and their relationship to propagation channel characteristics. With a comprehensive introduction to mmWave channel models, the book allows readers to carefully review and select the most app
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Book chapters on the topic "Terahertz (THz) Bands"

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Halkhams, Imane, Wafae El Hamdani, and Mohammed Fattah. "Design of a Frequency Reconfigurable Low Noise Amplifier for the Terahertz Band." In Terahertz Devices, Circuits and Systems. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4105-4_6.

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Kaur, Kanwar Preet, Trushit Upadhyaya, and Yogeshwar Kosta. "An Ultra-Thin Octad-Band THz Metamaterial Absorber with Polarization-Insensitivity for Sensor Applications." In Terahertz Devices, Circuits and Systems. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4105-4_2.

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El Ghzaoui, Mohammed. "Performance Analysis of EOS and SDI Detectors in THz Band." In Terahertz Wireless Communication Components and System Technologies. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9182-9_2.

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Shrivastava, Shivanshu, Sajal Agarwal, and Bin Chen. "Asset Allotment in Hybrid RF/VLC Communication in the 400–700 THz Band." In Terahertz Wireless Communication Components and System Technologies. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9182-9_14.

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Yu, Yang, Jin Li, and Rui Min. "A Scattering Model Based on GTD in Terahertz Band." In The Proceedings of the Second International Conference on Communications, Signal Processing, and Systems. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00536-2_101.

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Singh, Mandeep, Simranjit Singh, and Mohammad Tariqul Islam. "Highly Efficient Ultra-Wide Band MIMO Patch Antenna Array for Short Range THz Applications." In Emerging Trends in Terahertz Engineering and System Technologies. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9766-4_10.

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El Krouk, Abdeladim, Abdelhafid Es-saqy, Mohammed Fattah, et al. "Design of an Image Frequency Rejection Mixer for the Terahertz Band." In Next Generation Wireless Communication. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-56144-3_24.

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Li, Xiaofan, Bin Deng, Qiang Fu, and Hongqiang Wang. "Two-Dimensional Imaging of Sea-Surface Targets in the Terahertz Band." In 4th International Conference on Electronics and Signal Processing. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36670-3_1.

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Yuan, Yifang, and Yiping Han. "Ultra-Wide Dual-Band Fingerprint Spectral Sensing." In Proceedings of the 5th China and International Young Scientist Terahertz Conference, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-3786-4_16.

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Didi, Salah-Eddine, Imane Halkhams, Abdelhafid Es-Saqy, Mohammed Fattah, Said Mazer, and Moulhime El Bekkali. "Study and Design of a Printed Microstrip Antenna in the Terahertz Band." In Next Generation Wireless Communication. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-56144-3_27.

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Conference papers on the topic "Terahertz (THz) Bands"

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De, Ishani, and Vipul Rastogi. "Negative curvature annulus core fiber for transmission of orbital angular momentum modes in THz regime." In JSAP-Optica Joint Symposia. Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.18p_b2_4.

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In the electromagnetic spectrum terahertz band lies between microwave and infrared bands. By convention, the terahertz window is generally considered from a frequency range of 0.1 THz to 10 THz. For this terahertz window, the development of sources and detectors has resulted in research interest in low-loss communication channels. Propagation of THz radiation in free space is lossy due to water vapor content. So, designing a guided wave medium, especially fiber, is the need of the hour [1].
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Freudenstein, J., S. Ito, M. Schüler, et al. "Subcycle Formation of Floquet-Bloch Bands." In 2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, 2024. http://dx.doi.org/10.1109/irmmw-thz60956.2024.10697707.

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Tominaga, Yoriko, Fumitaro Ishikawa, Noriaki Ikenaga, and Osamu Ueda. "Low-temperature-grown dilute bismide III-V compound semiconductors towards fabrication of photoconductive antenna for terahertz-wave emission and detection." In JSAP-Optica Joint Symposia. Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.18p_b2_10.

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Towards the 6th generation mobile communications system (6G), it is considered to expand a frequency band higher than that for 5G, 95 GHz–3 THz, and electromagnetic waves up to approximately 300 GHz are under consideration[1]. Therefore, developing and realizing devices that can operate in these frequency bands is an urgent issue. It is essential to elucidate the dielectric, magnetic, and electrical properties of semiconductors and other electronic materials, which constitute the development and manufacturing processes, in these frequency bands. It is said that 6G will be in operation in 2030,
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Zeng, Yuanhao, Kosaku Kato, Verdad C. Agulto, et al. "New Composition Signal Among Comb-Like Terahertz Spectrum Generated Using Dual Multimode Laser Diodes." In JSAP-Optica Joint Symposia. Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.18p_b2_13.

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The application of sub-THz technology in material evaluation is gaining traction. As sub-THz frequencies are expected to be used in "beyond the 5th generation" (B5G) and 6G wireless communication bands, there is a need for material testing technology in this region. [1-3] A continuous wave multi-mode laser diode (CW-MLD) based THz time-domain spectroscopy (TDS) [4-6] system offers a cost-effective alternative to systems using femtosecond lasers. A 660 nm MLD can generate sub-terahertz spectra from 25 GHz to 200 GHz. However, the THz spectra produced by a single MLD have a comb-like structure w
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Michailow, Wladislaw. "Exploiting quantum phenomena for sensitive photonic terahertz detection." In Sensors and Communication Technologies in the 1 GHz to 10 THz Band, edited by Neil A. Salmon and Wladislaw Michailow. SPIE, 2024. http://dx.doi.org/10.1117/12.3031539.

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Zhao, Zixi, Verdad C. Agulto, Toshiyuki Iwamoto, et al. "Study of c- and m-plane properties of ZnO via terahertz time-domain ellipsometry." In JSAP-Optica Joint Symposia. Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.18p_b2_6.

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The terahertz region has recently attracted much attention as the next-generation communication (Beyond 5G, 6G) band, meanwhile, material characterization techniques in the terahertz region have also emerged to meet the needs of 6G devices development [1-3]. Currently, the most widely used characterization technique in the THz band is terahertz time-domain spectroscopy (THz-TDS). However, THz-TDS faces challenges in characterizing high carrier density semiconductors and its phase precision needs improvement.
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Jarrahi, Mona. "Terahertz sensing and communication systems based on plasmonic optoelectronics." In Sensors and Communication Technologies in the 1 GHz to 10 THz Band, edited by Neil A. Salmon and Wladislaw Michailow. SPIE, 2024. http://dx.doi.org/10.1117/12.3031786.

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Sebastian, Rejeena R., Redwan Ahmad, Jonathan Lafrenière-Greig, Xavier Ropagnol, and François Blanchard. "AI-assisted ultrafast and efficient terahertz spectrometer using frequency selective surfaces." In Sensors and Communication Technologies in the 1 GHz to 10 THz Band, edited by Neil A. Salmon and Wladislaw Michailow. SPIE, 2024. http://dx.doi.org/10.1117/12.3030981.

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Valušis, Gintaras, Sergey Orlov, Rusnė Ivaškeviciute-Povilauskiene, et al. "Silicon-based diffractive optics for structured light in nonparaxial terahertz imaging systems." In Sensors and Communication Technologies in the 1 GHz to 10 THz Band, edited by Neil A. Salmon and Wladislaw Michailow. SPIE, 2024. http://dx.doi.org/10.1117/12.3031681.

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Born, Norman, Maik Scheller, Jerome V. Moloney, and Martin Koch. "Cavity enhanced modulation of sharp THz bands." In 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2014. http://dx.doi.org/10.1109/irmmw-thz.2014.6956238.

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