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Proceedings Paper

Surface characterization of the photorefractive crystals CdAs2 and ZnAs2 using electroreflectance
Author(s): Ludmila A. Matveeva; I. M. Matiyuk
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Paper 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.

Paper Details

Date Published: 30 May 2001
PDF: 4 pages
Proc. SPIE 4418, Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 44180X (30 May 2001); doi: 10.1117/12.428319
Show Author Affiliations
Ludmila A. Matveeva, Institute of Semiconductor Physics (Ukraine)
I. M. Matiyuk, Institute of Semiconductor Physics (Ukraine)

Published in SPIE Proceedings Vol. 4418:
Eighth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals
Gertruda V. Klimusheva; Andrey G. Iljin, Editor(s)

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