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Angular dependence of the reflection spectra and directional dispersion of the anisotropic exciton polaritons in ZnO
Author(s) -
Hümmer K.,
Gebhardt P.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220850130
Subject(s) - polariton , reflection (computer programming) , exciton , dispersion relation , condensed matter physics , spectral line , dispersion (optics) , anisotropy , oscillator strength , optics , fresnel equations , materials science , physics , molecular physics , quantum mechanics , computer science , refractive index , programming language
Abstract The reflection spectra of the ordinary and extraordinary polaritons near the A 1 ‐, B 1 ‐exciton resonances of ZnO are presented for two geometries: normal reflection of planes inclined to the c ‐axis at varying degrees, and oblique reflection of as‐grown (10 I 10) faces. The experimental and theoretical spectra are compared. The calculations are based on a) the dispersion relations derived from Fresnel's equation taking account of spatial dispersion, b) the Pekar additional boundary conditions combined with an exciton free surface layer. There are indications of the correlation between the thickness of this layer and decreasing oscillator strength of the polaritons.