Symmetry Analysis of ZnSe(100) Surface in Air By Second Harmonic Generation

الأصل · EN

Polarized and azimuthal dependencies of optical second harmonics generation (SHG) at the surface of noncentrosymmetric semiconductor crystals have been measured on polished surfaces of ZnSe(100), using a fundamental wavelength of 1.06μm. The SHG intensity patterns were analyzed for all four combination of p- and s-polarized incidence and output, considering both the bulk and surface optical nonlinearities in the electric dipole approximation. We found that the measurement using Sin-Sout is particularly useful in determining the symmetry of the oxdized layer interface, which would lower the effective symmetry of the surface from C₄ᵥ to C₂ᵥ. We also have shown that the [011] and [011] directions can be distinguished through the analysis of p-incident and p-output confugration.