Spectral Emission by Polaritons in CaF_2 and MgO

概要

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Thermal emission spectra measurements of thin films were made from 400 to 1100 cm<-1> for CaF_2 and from 400 to 1300 cm<-1> for MgO at emission angles ranging from 10° to 80° and at temperatures 470 K and 605 K. The observed emission peaks near the frequencies of long wavelength longitudinal optical(LO) modes, which are a function of sample thickness and emission angle, are explained by the virtual mode theory. The upper branch of the polariton dispersion curve and the polariton lifetime were experimentally determined by analyzing the observed emission peaks due to the 0TH virtual mode which is the lowest mode in high frequency region with respect to the LO frequency. The linewidth of the polariton arising from the lattice anharmonicity was obtained by subtracting the width due to the radiation damping of 0TH mode from the observed width. The results agree fairly well with the theoretical curve of the damped polariton.
社団法人日本物理学会の論文
1972-08-05