In terahertz (THz) detectors, based on the excitation of electron plasma oscillations in the two-dimensional electron gas (2DEG) channel, the incident electromagnetic wave is repeatedly reflected between the metal-coated back surface of the GaAs substrate and top surface of the detector. Under certain conditions, a standing terahertz (THz) wave can be established. Placement of the 2DEG in the antinode of the standing wave can result in strong absorption of the detecting THz radiation as we confirmed by analytical calculations and experimental measurements of frequency dependences of THz reflection and absorption coefficients. Effects of the metal bus connecting the fingers of the grating-gate and thickness of the GaAs substrate on the performance of the THz detector were studied as well. It was demonstrated that the spatial separation of the gate fingers from bus metallization by the mesa resistor resulted in the enhanced photoresponse of the detector.
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28 August 2019
Research Article|
August 26 2019
Cavity and contact matching effects in plasma wave terahertz detectors
Special Collection:
Advances in Terahertz Solid-State Physics and Devices
Anatoly Kovalchuk
;
Anatoly Kovalchuk
a)
1
IMT RAS
, Chernogolovka 142432, Russia
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Marina Kovalchuk
;
Marina Kovalchuk
1
IMT RAS
, Chernogolovka 142432, Russia
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Irina Khmyrova;
Irina Khmyrova
2
University of Aizu
, Aizu-Wakamatsu 965-8580, Japan
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Sergei Shapoval
Sergei Shapoval
1
IMT RAS
, Chernogolovka 142432, Russia
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a)
Electronic mail: anatoly-fizmat@mail.ru
J. Appl. Phys. 126, 084502 (2019)
Article history
Received:
November 26 2018
Accepted:
July 25 2019
Citation
Anatoly Kovalchuk, Marina Kovalchuk, Irina Khmyrova, Sergei Shapoval; Cavity and contact matching effects in plasma wave terahertz detectors. J. Appl. Phys. 28 August 2019; 126 (8): 084502. https://doi.org/10.1063/1.5081142
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