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Proceedings Paper

Multifrequency terahertz-wave emission and detection with the photomixing approach: theory and experiments
Author(s): F. L. Constantin
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Paper Abstract

This contribution addresses theoretically and experimentally the photomixing signal in a low-temperature-grown GaAs (LTG-GaAs) device with a planar antenna that is driven with an alternative electric field superposed on a bias electric field. The total electric field is applied on the optically-driven nonlinear photoconductance of LTG-GaAs. A theoretical framework based on unidimensional carrier transport is developed to calculate the amplitudes and the phases of different spectral components of the current density. Radiofrequency modulation of the photomixing signal in the microwave domain is experimentally demonstrated. Conversely, the photomixer is exploited as an optically-driven detector. Heterodyne detection with a photomixer is experimentally demonstrated with modulated THz-waves. The photomixing approach allows to extract THz modulation parameters by measurements with a modulated optical beat.

Paper Details

Date Published: 30 March 2020
PDF: 6 pages
Proc. SPIE 11348, Terahertz Photonics, 113480A (30 March 2020); doi: 10.1117/12.2555526
Show Author Affiliations
F. L. Constantin, Lab. PhLAM, CNRS (France)


Published in SPIE Proceedings Vol. 11348:
Terahertz Photonics
Mona Jarrahi; Sascha Preu; Dmitry Turchinovich, Editor(s)

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