Optical-heterodyne generation in low-temperature-grown GaAs up to 1.2 THz

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Abstract
Low-temperature-grown, non-stoichiometric GaAs is used as an optical mixer to generate coherent output radiation up to a frequency of 1.2 THz. The mixer structure consists of an epitaxial layer of the LTG GaAs material with submicron interdigitated electrodes fabricated on the top surface. Terahertz photocurrents are generated in the gaps between the electrodes and power is radiated by coupling these currents efficiently into a self-complementary spiral antenna. The experimental roll-off in photomixer output power is explained by two time constants - one for the electron-hole recombination time of 0.35 ps and the other for the photomixer-antenna RC time constant of 0.62 ps. The photomixer demonstrates the capability to generate continuous-wave radiation in a spectral region where tunable coherent radiation has been lacking.

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