FEM Simulation of THz Detector Based on Sb and Bi88Sb12 Thermoelectric Thin Films

Tukmakova, A. S.; Asach, Alexei V.; Tkhorzhevskiy, Ivan L.; Kablukova, N. S.; Demchenko, Petr; Zaitsev, Anton D.; Khodzitsky, Mikhail K.

doi:10.3390/app10061929

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…The multigrid approach utilizes a mesh hierarchy of varying densities. The software algorithm reduces solution time [18][19].…”

Section: Finite Element Methods Simulation Of Guided Wave Phenomena At Terahertz Frequenciesmentioning

confidence: 99%

Optical Waveguides and Terahertz Signal by Finite Element Method: A Survey

Smitha¹,

Madhura²,

Shreya³

et al. 2021

JSWS

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This paper examines the use of the Finite Element Method (FEM) in the field of optical waveguides and terahertz signals, with the main goal of explaining how this method aids in recent advances in this field. The basics of FEM are briefly reviewed, and the technique's application to waveguide discontinuity analysis is observed. Second-order and higher-order derivatives result from optical waveguide modeling, which is significant for information exchange and many other nonlinear phenomena. The use of FEM in the improvised design of hexagonal sort air hole porous core microstructure fibers, which produces hexagonal structure cladding and rectangular-shaped air holes in the fiber core for excellent terahertz signal transmission, was also observed. These modifications were intended to improve the fiber's properties in comparison to other structures. This approach verifies that the fiber has high birefringence, low material loss, a high-power fraction, and minimal dispersion varia-tion. The features of square-type microstructure fiber are investigated. A folded-shaped po-rous cladding design is recognized for sensing applications. This type of photonic crystal fiber is also known as FP-PCF since it features circular air holes. The most approximate findings of this application are obtained using FEM. In comparison to many other approach-es for various applications, it is evident that FEM is a powerful and numerically efficient tool. This work does a survey of optical waveguides and terahertz signals using the Finite Element Method. Terahertz signals can be used in conjunction with electromagnetic waves to identify viruses. Thus, Terahertz signals are employed in real-world applications such as fuel adulteration, liquid metal synthesis, and virus detection.

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“…The multigrid approach utilizes a mesh hierarchy of varying densities. The software algorithm reduces solution time [18][19].…”

Section: Finite Element Methods Simulation Of Guided Wave Phenomena At Terahertz Frequenciesmentioning

confidence: 99%

Optical Waveguides and Terahertz Signal by Finite Element Method: A Survey

Smitha¹,

Madhura²,

Shreya³

et al. 2021

JSWS

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“…The 2D description has been performed using special options: "thin layer" in heat transfer interface and "transition boundary condition" in electromagnetic waves interface. The equations that are used for 2D description are listed in our previous publication [48]. The comparison between temperature change in 2D and 3D case showed that 2D description of film gives a temporal temperature function close to the linear (Figure 7a).…”

Section: The Impact Of Thin Film Description On Temperature Increase Functionmentioning

confidence: 96%

FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection

et al. 2021

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Terahertz (THz) filters and detectors can find a wide application in such fields as: sensing, imaging, security systems, medicine, wireless connection, and detection of substances. Thermoelectric materials are promising basis for THz detectors’ development due to their sensitivity to the THz radiation, possibility to be heated under the THz radiation and produce voltage due to Seebeck effect. Thermoelectric thin films of Bi-Sb solid solutions are semimetals/semiconductors with the band gap comparable with THz energy and with high thermoelectric conversion efficiency at room temperature. Detecting film surface can be transformed into a periodic frequency selective surface (FSS) that can operate as a frequency filter and increases the absorption of THz radiation. We report for the first time about the simulation of THz detector based on thermoelectric Bi-Sb thin-filmed frequency-selective surface. We show that such structure can be both detector and frequency filter. Moreover, it was shown that FSS design increases not only a heating due to absorption but a temperature gradient in Bi-Sb film by two orders of magnitude in comparison with continuous films. Local temperature gradients can reach the values of the order of 100 K· mm−1. That opens new perspectives for thin-filmed thermoelectric detectors’ efficiency increase. Temperature difference formed due to THz radiation absorption can reach values on the order of 1 degree. Frequency-transient calculations show the power dependence of film temperature on time with characteristic saturation at times around several ms. That points to the perspective of reaching fast response times on such structures.

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“…Существующие детекторы ТГц-ИК диапазона можно разделить на две группы по принципу работы: фотонные и тепловые [1][2][3][4][5][6][7][8]. В фотонных детекторах излучение поглощается внутри материала путем внутреннего фотоэффекта, т. е. непосредственного взаимодействия фотонов с носителями заряда.…”

Section: Introductionunclassified

Особенности Распространения И Поглощения Электромагнитных Сигналов В Периодических Структурах Из Проводящих И Диэлектрических Слоев

Богацкая¹,

Кленов²,

Никифорова³

et al. 2022

Оптика И Спектроскопия

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Different regimes of electromagnetic signal transmission through heterostructures formed by a sequence of conducting and non-conducting layers are discussed for various ratios between the frequency of radiation and the transport frequency of electron scattering in the conducting layers. Possibility to increase the efficiency of detecting or filtering electromagnetic radiation in a wide range of frequency range (from subTHz to far IR) in such structures is analyzed.

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FEM Simulation of THz Detector Based on Sb and Bi88Sb12 Thermoelectric Thin Films

Cited by 7 publications

References 31 publications

Optical Waveguides and Terahertz Signal by Finite Element Method: A Survey

Optical Waveguides and Terahertz Signal by Finite Element Method: A Survey

FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection

Особенности Распространения И Поглощения Электромагнитных Сигналов В Периодических Структурах Из Проводящих И Диэлектрических Слоев

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