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Phase-Coherent Heterodyne Detection in the Terahertz Regime With a Photomixer

Abstract : A low-temperature-grown GaAs photomixer with a spiral antenna has a quadratic response to the optical fields and an intrinsic nonlinear IV characteristic that allow the detection of THz radiation. A transmission line coupled to the antenna provides the photomixer with direct-current access in the microwave domain. The non-ohmic response of the photomixer is probed by rectification. The optical beat between two continuous-wave lasers illuminating the photomixer serves as a local oscillator with an adjustable difference-frequency in the THz domain. The beat between a THz field modulated at a radiofrequency rate with a radiofrequency-modulated optical beat is exploited in a phase-sensitive detection scheme.
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Contributor : Florin Lucian Constantin Connect in order to contact the contributor
Submitted on : Thursday, September 23, 2021 - 6:50:05 PM
Last modification on : Tuesday, October 19, 2021 - 10:59:24 AM


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Florin Lucian Constantin. Phase-Coherent Heterodyne Detection in the Terahertz Regime With a Photomixer. IEEE Journal of Quantum Electronics, Institute of Electrical and Electronics Engineers, 2011, 47 (11), pp.1458-1462. ⟨10.1109/JQE.2011.2163152⟩. ⟨hal-03335686⟩



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