Mid-infrared two-photon absorption in an extended-wavelength InGaAs photodetector

We investigate the nonlinear optical response of a commercial extended-wavelength In0.81Ga0.19As uncooled photodetector. Degenerate two-photon absorption in the mid-infrared range is observed using a quantum cascade laser emitting at λ = 4.5 μm as the excitation source. From the measured two-photon...

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Bibliographic Details
Published in:Applied physics letters 2018-01, Vol.112 (4)
Main Authors: Piccardo, Marco, Rubin, Noah A., Meadowcroft, Lauren, Chevalier, Paul, Yuan, Henry, Kimchi, Joseph, Capasso, Federico
Format: Article
Language:English
Subjects:
Absorptivity
Applied physics
Nonlinear response
Photoelectric effect
Photoelectric emission
Photometers
Photon absorption
Quantum cascade lasers
Scaling laws
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Summary:We investigate the nonlinear optical response of a commercial extended-wavelength In0.81Ga0.19As uncooled photodetector. Degenerate two-photon absorption in the mid-infrared range is observed using a quantum cascade laser emitting at λ = 4.5 μm as the excitation source. From the measured two-photon photocurrent signal, we extract a two-photon absorption coefficient β(2) = 0.6 ± 0.2 cm/MW, in agreement with the theoretical value obtained from the Eg−3 scaling law. Considering the wide spectral range covered by extended-wavelength InxGa1–xAs alloys, this result holds promise for applications based on two-photon absorption for this family of materials at wavelengths between 1.8 and 5.6 μm.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5018619