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30 May 2022 Infrared to mid-infrared non-degenerate two-photon absorption spectroscopy of bulk silicon
Sanaz Faryadras, Nicholas Cox, David J. Hagan, Eric W. Van Stryland
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Proceedings Volume PC12091, Image Sensing Technologies: Materials, Devices, Systems, and Applications IX; PC1209105 (2022) https://doi.org/10.1117/12.2618402
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States
Abstract
Non-degenerate two-photon absorption (ND-2PA) across the indirect gap of silicon is theoretically and experimentally investigated in the current work. We present measurements of the 2PA coefficient of bulk silicon using femtosecond pump and probe pulses in the IR and mid-IR range. Enhancement of ND-2PA was observed from the results of our measurements with increasing non-degeneracy. This can be utilized when designing sensitive silicon-based mid-IR detectors. Modeling of the 2PA was performed by considering three theoretical pathways across the band structure of silicon for the two photons and a phonon, and the most dominant processes are determined by comparison to our measurements.
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Sanaz Faryadras, Nicholas Cox, David J. Hagan, and Eric W. Van Stryland "Infrared to mid-infrared non-degenerate two-photon absorption spectroscopy of bulk silicon", Proc. SPIE PC12091, Image Sensing Technologies: Materials, Devices, Systems, and Applications IX, PC1209105 (30 May 2022); https://doi.org/10.1117/12.2618402
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KEYWORDS
Mid-IR
Silicon
Infrared imaging
Infrared radiation
Absorption
Absorption spectroscopy
Infrared spectroscopy
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