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We describe the strong optomechanical dynamical interactions in ultrahigh-Q/Vslot-type photonic crystal cavities. The dispersive coupling is based on amode-gap photonic crystal cavities with light localization in an air mode with0.02(lambda/n)3 modal volumes while preserving optical cavity Q up to 5 x 106.The mechanical mode is modeled to have fundamental resonance omega_m/2pi of 460MHz and a quality factor Qm estimated at 12,000. For this slot-typeoptomechanical cavity, the dispersive coupling gom is numerically computed atup to 940 GHz/nm (Lom of 202 nm) for the fundamental optomechanical mode.Dynamical parametric oscillations for both cooling and amplification, in theresolved and unresolved sideband limit, are examined numerically, along withthe displacement spectral density and cooling rates for the various operatingparameters.

Design of dispersive optomechanical coupling and cooling in ultrahigh-Q/V slot-type photonic crystal cavities