Optical-to-terahertz conversion through plasmon-coupled surface states

Deniz Turan; Ping Keng Lu; Mona Jarrahi

doi:10.1117/12.2586927

12 April 2021 Optical-to-terahertz conversion through plasmon-coupled surface states

Deniz Turan, Ping Keng Lu, Mona Jarrahi

Proceedings Volume 11725, Next-Generation Spectroscopic Technologies XIV; 1172503 (2021) https://doi.org/10.1117/12.2586927
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

We demonstrate passive optical-to-terahertz conversion through plasmon-coupled surface states. When excited with an optical pump beam, photogenerated carriers in a photo-absorbing substrate are swept to an array of terahertz radiating nanoantennas by a surface-state-induced built-in electric field formed between the nanoantennas and substrate. The nanoantennas are used to couple optically-excited surface waves to the interface region where the built-in electric field is maximized to provide high optical-to-terahertz conversion efficiencies. We have used this scheme to develop a fiber-coupled bias-free terahertz source that provides more than a 110 dB dynamic range over a 5 THz bandwidth.

Conference Presentation

Citation Download Citation

Deniz Turan, Ping Keng Lu, and Mona Jarrahi "Optical-to-terahertz conversion through plasmon-coupled surface states", Proc. SPIE 11725, Next-Generation Spectroscopic Technologies XIV, 1172503 (12 April 2021); https://doi.org/10.1117/12.2586927

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