TM optical modes paired with vertically breathing mechanical modes in metamaterial-cladded silicon membranes produce boundary-dominated forward Brillouin scattering at 12 GHz with 7200 W^{-1} m^{-1} gain and Q=620, the highest gain-to-Q ratio in silicon waveguides.
Kittlaus, Heedeuk Shin, and Peter T
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Boundary-dominated optomechanics in silicon metamaterial membranes
TM optical modes paired with vertically breathing mechanical modes in metamaterial-cladded silicon membranes produce boundary-dominated forward Brillouin scattering at 12 GHz with 7200 W^{-1} m^{-1} gain and Q=620, the highest gain-to-Q ratio in silicon waveguides.