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15 March 2023 Passive optical-to-terahertz conversion through semiconductor band engineering
Ping Keng Lu, Deniz Turan, Mona Jarrahi
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Proceedings Volume PC12419, Ultrafast Phenomena and Nanophotonics XXVII; (2023) https://doi.org/10.1117/12.2647664
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We present a bias-free photoconductive terahertz generation scheme based on band-engineered photoconductive layers, enabling completely passive optical-to-terahertz conversion with zero dark current. By engineering the band structure of the photoconductive layers, a built-in electric field is induced, leading to efficient collection of almost all optically generated electrons. Additionally, a large area plasmonic nanoantenna array is utilized to enhance the optical absorption near each nanoantenna to reduce the average electron transit time to the radiating elements. Using this scheme, we demonstrate record-high optical-to-terahertz conversion efficiencies compared to previously demonstrated passive techniques utilizing nonlinear optical processes, spintronics, and photo-Dember effect.
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Ping Keng Lu, Deniz Turan, and Mona Jarrahi "Passive optical-to-terahertz conversion through semiconductor band engineering", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2647664
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KEYWORDS
Optical semiconductors
Semiconductors
Terahertz sources
Electrons
Nanoantennas
Terahertz radiation
Reliability
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