Theory of Indirect Excitation of Sound by Light

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Abstract
A semiclassical theory of the excitation by light of crystalline quasiparticles coupled "indirectly" to light via an intermediate field is presented and illustrated via a model photon-exciton-phonon system. The resonance behavior of the excitation efficiency is investigated for various values of the couplings, and dependences on boundary conditions and damping effects are illustrated. Sharply resonant behavior results for sufficiently strong couplings and small enough damping, suggesting the possibility of applications of "indirect" excitation by light in actual devices, as well as in the study of microscopic properties of materials.