Surface characterization of the photorefractive crystals CdAs2 and ZnAs2 using electroreflectance

Ludmila A. Matveeva; I. M. Matiyuk

doi:10.1117/12.428319

30 May 2001 Surface characterization of the photorefractive crystals CdAs₂ and ZnAs₂ using electroreflectance

Ludmila A. Matveeva, I. M. Matiyuk

Author Affiliations +

Proceedings Volume 4418, Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals; 44180X (2001) https://doi.org/10.1117/12.428319
Event: Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 2000, Alushta, Crimea, Ukraine

Abstract

Significant magnitude of the dual beam refraction and gyrotropic characterized CdAs2 and ZnAs2 monocrystals are observed. Nonlinear effects, for example self -inducted rotation of the plane of polarization, exist for these materials due -to crystals symmetry and connect with spatial dispersion. These crystals is very important for following applications: light modulator, frequency reduplicator, optical filters, lenses and polarize prisms for IR region of the spectrum. Optical surface state of the photoreflective CdAs2 and ZnAs2 monocrystals were investigated by electroreflectance (ER) in dependence from surface treatment. The metods of elkectroreflectance modulation spectroscopy (ERMS) make it possible to investigate direct transitions in peculiar points of the Brillouin zone. The parameters of broadening of these transitions F, which can be calculated from the ERMS spectra, are integral characteristics of scattering of carriers on lattice defects. The shift of optical transitions and change of the parameter F are sensitive indicators of the state of the reflecting surface with respect to the mechanical stresses, electrical charge, presence of adsorbed molecules and oxide films, presence of microdefects. For this reason, the study of the zone structure of these materials and the influence of treatment of their surface on their physical properties became the subject of this to work. For this aim, monocrystals of CdAs2 (spase group D , tetragonal structure) and ZnAs2 (spase 4 5 group C , monoclinic structure) were for the first time investigated by the ERMS method.

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Ludmila A. Matveeva and I. M. Matiyuk "Surface characterization of the photorefractive crystals CdAs₂ and ZnAs₂ using electroreflectance", Proc. SPIE 4418, Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 44180X (30 May 2001); https://doi.org/10.1117/12.428319

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KEYWORDS

Crystals

Nonlinear crystals

Lenses

Modulation

Modulators

Optical filters

Polarization

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