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We numerically study silicon waveguides on silica showing that it is possibleto simultaneously guide optical and acoustic waves in the technologicallyimportant silicon on insulator (SOI) material system. Thin waveguides, or fins,exhibit geometrically softened mechanical modes at gigahertz frequencies withphase velocities below the Rayleigh velocity in glass, eliminating acousticradiation losses. We propose slot waveguides on glass with telecom opticalfrequencies and strong radiation pressure forces resulting in Brillouin gainson the order of 500 and 50,000 1/(Wm) for backward and forward Brillouinscattering, respectively.

Guided acoustic and optical waves in silicon-on-insulator for Brillouin scattering and optomechanics