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Published on: June 28, 2016
Two-photon absorption in silicon using the real density matrix approach
David Ziemkiewicz1, David Knez2, Evan P Garcia2
1Institute of Mathematics and Physics, Technical University of Bydgoszcz, Al. Prof. S. Kaliskiego 7, 85-789 Bydgoszcz, Poland.
Abstract:
Two-photon absorption in indirect gap semiconductors is a frequently encountered, but not well-understood phenomenon. To address this, the real-density matrix approach is applied to describe two-photon absorption in silicon through the excitonic response to the interacting fields. This approach produces an analytical expression for the dispersion of the two-photon absorption coefficient for indirect-gap materials and can be used to explain trends in reported experimental data for bulk silicon both old and new with minimal fitting.
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