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We experimentally demonstrate an optomechanical cavity based on an air-slotphotonic crystal cavity with optical quality factor Qo=4.2\times10^4 and asmall modal volume of 0.05 cubic wavelengths. The optical mode is coupled withthe in-plane mechanical modes with frequencies up to hundreds of MHz. Thefundamental mechanical mode shows a frequency of 65 MHz and a mechanicalquality factor of 376. The optical spring effect, optical damping andamplification are observed with a large experimental optomechanical couplingrate gom/2pi of 154 GHz/nm, corresponding to a vacuum optomechanical couplingrate g*/2pi of 707 kHz. With sub-mW or less input power levels, the cavityexhibits strong parametric oscillations. The phase noise of the photoniccrystal optomechanical oscillator is also measured.

Parametric Optomechanical Oscillations in Two-Dimensional Slot-Type High-Q Photonic Crystal Cavities