Two-Photon Resonance Raman Scattering with Recoiling Excitonic Polariton in CuCl

Abstract

Two-photon resonance Raman scattering associated with the giant two-photon absorption into the excitonic molecule state has been measured in near-forward scattering geometry, and a new type of Raman lines has been observed whose energies depend on the direction of observation. These Raman lines can well be explained as the Raman processes in which the excitonic molecule and excitonic polariton are the intermediate and final states, respectively.