Figure 2.

Schematic of a double-section laser design and the experimental setup for SLQD absorption measurements. (a) Schematic of a double-section laser design with amplifying and absorbing sections, used to measure the electroluminescence, and absorption spectra for two light polarization directions: in the plane perpendicular to the growth axis (⊥) (x–y plane) and along the growth direction (||) (z axis) of the structure. (b) and (c) The experimental setup for SLQD absorption measurements: (b) direct detection of electroluminescence spectra and (c) detection of electroluminescence passed through absorbing section.