title: Breakdown of the linear acousto-optic interaction regime in phoxonic cavities.
abstract: The limits of validity of the linear photoelastic model are investigated in a one-dimensional dual photonic-phononic cavity, formed by alternating layers of a chalcogenide glass and a polymer homogeneous and isotropic material, which supports both optical and acoustic resonant modes localized in the same region. It is shown that the linear-response regime breaks down when either the acoustic excitation increases or the first-order acousto-optic interaction coupling element vanishes by symmetry, giving rise to the manifestation of multiphonon absorption and emission processes by a photon. Our results provide a consistent interpretation of different aspects of the underlying physics relating to nonlinear acousto-optic interactions that can occur in such cavities.
authors.forename: Evangelos
authors.initials: E
authors.lastname: Almpanis
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Papanikolaou
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Stefanou
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D016014:Linear Models; D008956:Models, Chemical; D055096:Optical Devices; D012542:Scattering, Radiation; D013016:Sound; D020349:Surface Plasmon Resonance / Q000295:instrumentation*