Abstract

We report on multiphoton absorption (MPA) of a type-II superlattice (T2SL) infrared photodetector using InAs/GaSb materials. At 87 K, the 100% cutoff wavelength of the detector response is 3.4 µm for linear absorption; however, we have observed degenerate two and higher MPA using a quantum cascade laser ($ \lambda = 4.6\,\,\unicode{x00B5}{\rm m} $) as the excitation source. The observed photocurrent responses are designated as due to two-photon, five-photon, and 11-photon absorption for different incident laser power ranges. Considering the wide detection wavelength range covered, which extends from 1 to 30 µm, this result may demonstrate unlimited potential for research and applications based on MPA using InAs/GaSb T2SL materials.

© 2019 Optical Society of America

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