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Exciton Spectra with Spatial Dispersion in Case of Non‐Normal Incidence
Author(s) -
Skettrup T.
Publication year - 1973
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.2220600225
Subject(s) - plane of incidence , exciton , physics , incidence (geometry) , dispersion relation , polariton , boundary value problem , transverse plane , spectral line , optics , plane wave , reflection (computer programming) , resonance (particle physics) , refraction , condensed matter physics , quantum mechanics , structural engineering , engineering , computer science , programming language
Abstract The general case of non‐normal incidence of light on a crystal exhibiting spatial dispersion is treated. The light wave will in general excite two transverse and one longitudinal polariton in the crystal. Additional boundary conditions are obtained for the three‐dimensional case by means of the Lagrange formalism. The Fresnel formulae for reflection and refraction are derived, and exciton spectra for CdS are computed. Additional structure in the reflection spectrum near the longitudinal resonance energy is obtained for non‐normal incidence when the electric field of the light wave is parallel to the plane of incidence.