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We measured, for the first time, the anisotropic refractive index of porous InP obtained by photoassisted anodization of the (111)A surface in the direction parallel (n o=2.82) and perpendicular (n e=2.66) to the axis of the pores. The refractive index in the two directions was found to be 10–20% lower than the refractive index of bulk InP (n=3.17).

Near-normal reflectivity measurements with polarized light have been performed on good quality single crystals of Pd&Si in the spectral range from 0.05 to 4 eV. Moreover, spectral ellipsometry from 1.4 to 5 eV and nonpolarized re@ectivity from 3 to 12 eV have been used in order to Kramers-Kronig analyze the data and to obtain the dielectric functions. The results show strong anisotropy in the optical response for the polarization along the crystallographic c axis, or in the basal plane, of the hexagonal cell, according to the transport measurements. The optical properties of PdqSi have been calculated within the local-density approximation using the semirelativistic linear-mufBn-tin-orbital method. The band structure, the E-projected densities of states, the complex dielectric function, the optical conductivity, the optical re8ectivity, and the electron-energy-loss spectrum have been obtained in the energy range from 0 to 5 eV. The agreement with the experimental data is rather good.

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