Chapter 3. Ultra High Speed Devices and ConceptsNo Access

THZ DETECTION BY FIELD-EFFECT TRANSISTORS IN MAGNETIC FIELDS: SHALLOW WATER VS DEEP WATER MECHANISM OF ELECTRON PLASMA INSTABILITY

M. Sakowicz

Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

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J. Łusakowski

Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

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K. Karpierz

Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

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M. Grynberg

Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

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W. Knap

Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

also at: Tohoku University RIEC Ultra-broadband Signal Processing 2-1-1 Katahira, Aoba-ku 980-8577 Japan and GES-CNRS URM 5650, Universitè Montpellier 2, Place Eugène Bataillon, 34950 Montpellier, France.

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K. Köhler

Fraunhofer-Institut für Angewandte Festkörperphysik, D-79108 Freiburg, Germany

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G. Valušis

Semiconductor Physics Institute, A. Gostauto 11, Vilnius LT-01108, Lithuania

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K. Gołaszewska

Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warsaw, Poland

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E. Kamińska

Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warsaw, Poland

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, and

A. Piotrowska

Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warsaw, Poland

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https://doi.org/10.1142/S0129156408005904Cited by:4 (Source: Crossref)

Abstract

Detection of THz radiation by a high electron mobility (HEMT) GaAs/GaAlAs transistor was investigated at 4 K as a function of the magnetic field B. The detection signal (a source - drain photovoltage appearing as a response to THz radiation) was found to be periodic in B^-1, i.e., it showed Shubnikov - de Haas oscillations. A Fourier transform of the signal showed a large amplitude component independent of the gate voltage, and a small amplitude component dependent on it. This shows that a HEMT response to the radiation cannot be described either by a plasma instability in gated ("shallow water") or in ungated ("deep water") parts of the channel, but rather by a response of the channel as a whole. This is in a good correspondence with recent experimental evidence of antenna effects in detection of radiation by HEMTs and advanced theoretical models of instability of coupled gated - ungated plasma in HEMTs.

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