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.

Layered optomagnonic structures: Time Floquet scattering-matrix approach

“…In practice, this translates in calculating the relevant optical scattering amplitudes at a sequence of frozen snapshots of the spin wave, during a period, and, at the end of the calculation, obtain the frequency-domain response by Fourier transform. 33,36 A similar approach was also successfully applied to analyze acousto-optic interaction effects in corresponding phoxonic cavities, [43][44][45][46] encompassing both weak-and strong-coupling regimes and recovering the results of the widely employed linear photoelastic model in the weak-coupling limit. 46 However, the quasistatic adiabatic approximation has a number of drawbacks, which may be more likely manifested in the case of a spin instead of an acoustic pump wave because the former can attain higher frequencies without being strongly attenuated.…”

“…33,36 A similar approach was also successfully applied to analyze acousto-optic interaction effects in corresponding phoxonic cavities, [43][44][45][46] encompassing both weak-and strong-coupling regimes and recovering the results of the widely employed linear photoelastic model in the weak-coupling limit. 46 However, the quasistatic adiabatic approximation has a number of drawbacks, which may be more likely manifested in the case of a spin instead of an acoustic pump wave because the former can attain higher frequencies without being strongly attenuated. The adiabatic approximation precludes energy transfer from one wave to the other while, even more importantly, the frequency of the pump wave is decoupled from that of the light beam and thus its actual value becomes immaterial.…”

Simultaneous Guidance of Surface Acoustic and Surface Optical Waves in Phoxonic Crystal Slabs

“…Different kinds of PXC-based devices have also been proposed, including PXC waveguides [10,11], sensors [12][13][14][15], mode converters [16], and diodes [17]. Meanwhile, the photon-phonon coupling in PXC structures is another fascinating research field [18][19][20][21][22]. Eichenfield et al [23] experimentally demonstrated a one-dimensional (1D) optomechanical crystal (OMC) nanobeam cavity with large OM coupling.…”

Investigation of complete bandgaps in a piezoelectric slab covered with periodically structured coatings

“…When 39 elastic waves propagate in periodic structures [1], such as phono- 40 nic crystals (PNCs), some of them in a certain frequency range 41 may be totally reflected and cannot pass through these periodic 42 structures. This frequency range is termed bandgap.…”

“…As Fig. 7(a) shows, there or guide acoustic and optical waves simultaneously [14,[37][38][39][40][41][42]. 419 Piezoelectric materials possess piezoelectricity, which is unavail-420 able in dielectric materials such as silicon.…”