Normal incident infrared absorption from InGaAs/GaAsquantum dot superlattice

Abstract

The authors report for the first time, normal incident infrared absorption around the wavelength of 13–15 µm from a 20 period InGaAs/GaAs quantum dot superlattice (QDS). The structure of a QDS has been confirmed by cross-section transmission electron microscopy (TEM) and by a photoluminescence spectrum (PL). This opens the way to high performance 8–14 µm quantum dot infrared detectors.