Resonance Raman scattering and luminescence under two-photon excitation

Abstract

Two-photon forward Raman scattering in CuCl is the four polariton process; two incident polaritons ħω o(k o) are scattered into a pair of lower branch polaritons having different energies via excitonic molecule state at k=2k o. Scattering into lower and upper branch polaritons can take place via excitonic molecule with small k<k o. At resonant excitation, the secondary emission consists of Raman and luminescence components. From the line shapes of luminescence bands, the relaxation of resonantly created excitonic molecules is discussed.