Anisotropy of optical constants of ZnSe/BeTe heterostructures with no common atoms at the interfaces

The in-plane anisotropy of the refractive index and absorption coefficient in the blue-green spectral region in ZnSe/BeTe type-II heterostructures with no common atoms at the interface has been studied by ellipsometry in reflection. It was established that the relative difference (anisotropy) in the refractive index and absorption coefficient remains nonzero throughout the range covered and reaches 0.6% for the refractive index and 85% for the absorption coefficient. It was found that, in contrast to excitonic transitions involving a heavy hole, the anisotropy in absorption for the light-hole exciton is larger in magnitude and is of the opposite sign.