Almpanis E, Papanikolaou N, Stefanou N. Breakdown of the linear acousto-optic interaction regime in phoxonic cavities.
OPTICS EXPRESS 2014;
22:31595-31607. [PMID:
25607131 DOI:
10.1364/oe.22.031595]
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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.
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