Edge-coupled membrane terahertz photonic transmitters based on metal–semiconductor–metal traveling-wave photodetectors

Shi, Jin-Wei; Chu, Shi-Wei; Tien, Ming-Chun; Sun, Chi-Kuang; Chiu, Yi-Jen; Bowers, John E.
December 2002
Applied Physics Letters;12/30/2002, Vol. 81 Issue 27, p5108
Academic Journal
Ultra-high-speed photodetectors and printed-circuit antennas construct photonic transmitters. In this letter, we demonstrate a terahertz (THz) photonic transmitter: edge-coupled membrane photonic transmitters based on metal-semiconductor-metal traveling-wave photodetectors, which are fabricated with low-temperature-grown GaAs photoabsorption layers. With a membrane-based and edge-coupled structure, the demonstrated photonic transmitters can eliminate the requirement of Si lenses and attain an over 20 times higher optical-to-THz power conversion efficiency 2 × 10[sup -4] than vertical illuminated photonic transmitters with Si lenses at the same operation frequency.


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