Abstract

Two induced absorption lines from the upper and the lower branch excitonic polaritons to the excitonic molecule were observed in CuCl near the longitudinal exciton. The intensity of the induced absorption from the lower branch polariton decreases gradually with the increase of the energy at the high energy side of the longitudinal exciton. The oblique incidence reflection spectra were also observed for the same sample. A sharp structure appears in the p wave reflection spectrum. A new theory of Additional Boundary Conditions by a model for the surface scattering of the polariton can fairly well explaine the observed results.

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