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High power generation of THz from 1550-nm photoconductive emitters.

A Mingardi, W-D Zhang, E R Brown, A D Feldman, T E Harvey, R P Mirin
Optics Express 2018 May 29
Two photoconductive emitters - one with a self-complementary square spiral antenna, and the other with a resonant slot antenna - were fabricated on a GaAs epilayer embedded with ErAs quantum dots. Driven with 1550 nm mode-locked lasers, ~117 μW broadband THz power was generated from the device with the spiral antenna, and ~1.2 μW from the device with resonant slot antenna. The optical-to-THz conversion is through extrinsic photoconductivity.

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