An Antenna-Coupled Dual-Gated Electron Channel as Direct Detector of 2 THz Radiation

Michailow, Wladislaw and Waldie, Joanna and Spencer, Peter and Almond, Nikita and Kindness, Stephen and Wu, Yuqing and Wei, Binbin and Wallis, Robert and Mitchell, Thomas and Degl'innocenti, Riccardo and Beere, Harvey and Ritchie, David (2021) An Antenna-Coupled Dual-Gated Electron Channel as Direct Detector of 2 THz Radiation. In: 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2020 :. International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz . IEEE Computer Society Press, USA, pp. 721-722. ISBN 9781728166209

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Abstract

An antenna-coupled dual-gated two-dimensional electron gas (2DEG) based on a GaAs-AlGaAs heterostructure shows a pronounced response to 2 THz radiation. The device is shown to be a direct detector, and its photoresponse arises without any source-drain bias. The detection is based on a novel mechanism that yields a substantially stronger photoresponse than predicted by the classical plasma-wave self-mixing and other mechanisms.