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5 March 2021 A frequency domain spectroscopy system working at telecommunication wavelengths without using short-carrier-lifetime photoconductors
Ping Keng Lu, Mona Jarrahi
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Proceedings Volume 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV; 1168512 (2021) https://doi.org/10.1117/12.2577978
Event: SPIE OPTO, 2021, Online Only
Abstract
We demonstrate, for the first time, a telecommunication-compatible terahertz frequency-domain spectroscopy system without requiring any short-carrier-lifetime photoconductors. The ultrafast response of the terahertz source and detector is achieved by incorporating plasmonic antenna electrodes and a thin layer of epitaxially-grown In0.53Ga0.47As to confine optical generation very close to the antenna electrodes. As a result, a short carrier transit time for most of the photocarriers is provided, inducing an ultrafast photocurrent for terahertz generation and detection. This design approach enables larger flexibility for the choice of photoconductors and operation wavelengths without being limited by the availability of short-carrier-lifetime photoconductors.
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Ping Keng Lu and Mona Jarrahi "A frequency domain spectroscopy system working at telecommunication wavelengths without using short-carrier-lifetime photoconductors", Proc. SPIE 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV, 1168512 (5 March 2021); https://doi.org/10.1117/12.2577978
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KEYWORDS
Photoresistors
Spectroscopy
Telecommunications
Antennas
Modulation
Sensors
Electrodes
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