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Competition between sub-bandgap linear detection and degenerate two-photon absorption in gallium arsenide photodiodes
Journal of the European Optical Society-Rapid Publications
This letter is on the response of gallium arsenide p-i-n diodes to sub-bandgap photons (1.55 μm). We investigate the various regimes of sub-bandgap operation by using different light sources delivering pulses ranging from nanosecond to microsecond durations. We evidence two regimes : a regime of degenerate two-photon absorption, with a clear quadratic dependence with respect to the incident flux, and a sub-bandgap, temperature dependant linear regime, that drives photocurrent generation atdoi:10.1186/s41476-016-0022-8 fatcat:4iplta75ongy5lsgusfuwya5qa