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Terahertz Photoconductive Metasurface Detector with enhanced Two-Step Photon Absorption at 1550 nm

Jung, Hyunseung; Hale, Lucy L.; Briscoe, Jayson B.; Sarma, Raktim S.; Luk, Ting S.; Addamane, Sadhvikas J.; Reno, John L.; Brener, Igal B.; Mitrofanov, Oleg

We demonstrate the use of low-temperature grown GaAs (LT-GaAs) metasurface as an ultrafast photoconductive switching element gated with 1550 nm laser pulses. The metasurface is designed to enhance a weak two-step photon absorption at 1550 nm, enabling THz pulse detection.