Helicity-sensitive detection of terahertz radiation enhanced by plasmons

Ilya V. Gorbenko; Valentin Yu. Kachorovskii; Michael S. Shur

doi:10.1117/12.2567622

20 August 2020 Helicity-sensitive detection of terahertz radiation enhanced by plasmons

Ilya V. Gorbenko, Valentin Yu. Kachorovskii, Michael S. Shur

Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 1149914 (2020) https://doi.org/10.1117/12.2567622
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Conference Poster

Abstract

We have developed a theory of the helicity-driven plasmonic dc response of the gated two-dimensional electron gas to the terahertz (THz) radiation. It was demonstrated that the phase difference between THz signals coupled to source and drain of the field effect transistor (TeraFET) induces a plasmon-assisted direct current (dc), which is dramatically enhanced in the vicinity of plasmonic resonances. We have also proposed an appropriate scheme for a phase-sensitive homodyne detector operating in this phase-asymmetry regime. As a key result, helicity and phase-sensitive conversion of circular polarized radiation into dc photovoltage induced by the plasmon- interference mechanism was observed: two plasma waves, excited at the source and the drain part of the transistor interfere inside of the channel. The helicity sensitive phase shift between these waves can be achieved by using an asymmetric antenna configuration. Suggested plasmonic detector is capable of measuring the phase difference between two arbitrary phase-shifted optical signals.

Citation Download Citation

Ilya V. Gorbenko, Valentin Yu. Kachorovskii, and Michael S. Shur "Helicity-sensitive detection of terahertz radiation enhanced by plasmons", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 1149914 (20 August 2020); https://doi.org/10.1117/12.2567622

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