Surface-induced optical anisotropy of the Si(110) surface.

Abstract

The reflectance-anisotropy spectrum of a hydrogen-covered Si(110) surface is calculated taking into account anisotropic surface polarizabilities and exactly solved local-field effects. Including in the calculation the most important features of the (2\ifmmode\times\else\texttimes\fi{}1) and (5\ifmmode\times\else\texttimes\fi{}1) reconstructions, i.e., the missing chains along the [001] direction, it is clearly demonstrated that the shape of anisotropic reflectance spectra is extremely sensitive to local-field effects. The agreement between the measured spectrum of the oxidized surface and the calculated spectrum of the (5\ifmmode\times\else\texttimes\fi{}1) reconstruction is striking as far as the order of magnitude, peak positions, and relative peak intensities are concerned.