Optical determination of growth variants in ordered GaInP

Measurements on the dependence of the ellipsometric parameters as a function of azimuthal angle allow the determination of the dielectric tensor including its orientation with respect to the sample surface. This is done in ordered GaInP at the fixed energy of 3.3 eV where the anisotropy manifests at largest. In such material this method allows to discriminate between the presence of singly or doubly ordered variants and, in the former case, allows to establish which one of the two subvariants (<[(1)over bar 11]> or <[1(1)over bar 1]>) is grown. (C) 1997 Elsevier Science Ltd.