Abstract

The dispersion relation for surface polaritons is investigated with real wave vector and complex frequency. The numerical solutions obtained for the complex frequencies are used to account for the widths of calculated attenuated-total-reflection lines in the limit of low coupling between the prism and the sample. The case of surface optic-phonon modes in GaP and GaAs is treated, as well as the case of coupled surface-plasmon optic-phonon modes in InSb. Calculated and experimental linewidths are compared for GaAs and InSb. The anomalously large linewidths found for InSb are discussed.

© 1974 Optical Society of America

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