InGaAs/InAlAs multiquantum well intersubband absorption at a wavelength of λ=4.4 μm

Abstract

We report, for the first time, intersubband absorption experiments in doped InGaAs/InAlAs multiquantum well superlattices and observe a resonance peak at a wavelength of λ=4.4 μm which is in good agreement with theory. This material system may be useful for detectors in the λ=3–5 μm spectral region.