Experimental evidence of anisotropy in theE0andE1optical spectra of corrugated GaAs/AlAs quantum-wire superlattices

Polarized photomodulated reflectivity experiments were performed on a series of GaAs/AlAs quantum-wire superlattices. The spectra show clear evidence of anisotropy in the ${\mathit{E}}_0$-related optical transitions, becoming more pronounced as the superlattices’ period decreases. A similar anisotropic behavior is also present in the ${\mathit{E}}_1$ and ${\mathit{E}}_1$+${\mathrm{\Delta }}_1$ critical-point transitions. These anisotropies are attributed to the corrugated nature of the samples.