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A single terahertz electromagnetic pulse that interacts with transverse-optic phonons in a crystal medium is found to have unique features in the presence of both the second- and the third-order nonlinearities. Specifically, for a short pulse with a broad plateau, coexistence is predicted between a bright and a dark polariton. Analytical expressions for the cross-sectional shape and the FWHM of the polariton pulse are derived.
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Hayata et al. (1994) studied this question.
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