Analysis of enhanced stimulated Brillouin scattering in silicon slot waveguides

Abstract

Stimulated Brillouin scattering has attracted renewed interest with the promise of highly tailorable integration into the silicon photonics platform. However, significant Brillouin amplification in silicon waveguides has yet to be shown. In an effort to engineer a structure with large photon-phonon coupling, we analyzed both forward and backward Brillouin scattering in high-index-contrast silicon slot waveguides. The calculations predict that gradient forces enhance the Brillouin gain in narrow slots. We estimate a currently feasible gain of about $10^5{\text{W}}^{-1}{\text{m}}^{-1}$, which is an order of magnitude larger than in a stand-alone silicon wire. Such efficient coupling could enable a host of Brillouin technologies on a mass-producible silicon chip.

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• Giant Gain Enhancement in Surface-Confined Resonant Stimulated Brillouin Scattering
• Thermal Brillouin noise observed in silicon optomechanical waveguide
• Theoretical study on the stimulated Brillouin scattering in a sub-wavelength anisotropic waveguide: Acousto-optical coupling coefficients and effects of transverse anisotropies
• Multiplexing Guided Optical and Acoustic Waves for Efficient Acousto-Optic Devices