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Shift of Optical Resonant Reflectance Extrema Due to Damping and Spatial Dispersion
Author(s) -
Grigorchuk N. I.
Publication year - 1995
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.2221920123
Subject(s) - maxima and minima , dispersion (optics) , reflectivity , optics , frequency shift , physics , maxima , phase (matter) , exciton , energy (signal processing) , materials science , atomic physics , condensed matter physics , molecular physics , mathematics , quantum mechanics , art , mathematical analysis , performance art , art history
The energy shifts of light reflectance extrema in the region of exciton resonances are studied taking into account the transitional layers, spatial dispersion (SD), and damping. The values and directions of the shifts of the extrema are determined depending on the round‐trip phase delay in the transitional layer. It is found that in the phase interval n π ≦ θ < n π + π/4 ( n = 0, 1, …) the long‐wave shift of the maximum is dominant while in the interval n π + π/4 < θ ≦ n π + π/2 mainly a short‐wave shift of the minimum occurs. The comparative roles of SD and damping are discussed. The equivalence of the mechanisms of SD and of damping effects on the frequency shift is established; the first one playing a more important role. Theoretical results agree with the available experimental data. Corresponding estimates for CdS, GaAs, and LiH crystals are made.