Novel designs of optoacoustic waveguides

Schmidt, M.K., O'Brien, M., Poulton, C.G., Mashanovich, G.Z., Reed, G.T., Eggleton, B.J. and Steel, M.J. (2019) Novel designs of optoacoustic waveguides. Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, , Melbourne, Australia. 08 - 12 Dec 2019. 2 pp . (doi:10.1117/12.2541121).

Abstract

We present two new designs of optoacoustic waveguides supporting nonlinear Brillouin scattering (SBS). The first design, optimized for forward SBS, comprises a rectangular core supporting a low-loss optical mode, suspended in air by a series of transverse ribs. The ribs are engineered to exhibit a complete acoustic stopband and suppress the transverse leakage of acoustic waves. The second design we discuss here is a realization of an Anti-Resonant Reflecting Acoustic Waveguide, which are analogues of optical ARROWs. These waveguides, capable of co-localization and guiding of both the optical and GHz acoustic waves in simple, translationally invariant waveguides, are shown to support backwards SBS.

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