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12 April 2021 Optical-to-terahertz conversion through plasmon-coupled surface states
Deniz Turan, Ping Keng Lu, Mona Jarrahi
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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.
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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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KEYWORDS
Terahertz sources
Imaging spectroscopy
Nanoantennas
Imaging systems
Indium arsenide
Terahertz radiation
Semiconductors
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