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Within the two antenna model, we develop a theory of the recently observedhelicity-sensitive detection of terahertz radiation by FETs. The effect arisesbecause of the mixing of the ac signals produced in the channel by the twoantennas. We calculate the helicity-dependent part of the photoresponse and itsdependence on the antenna impedance, gate length, and gate voltage.

Theory of helicity-sensitive terahertz radiation detection by field effect transistors