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Optical guided wave dielectric structures with nanoscale slots are known toprovide strong electric field enhancements in the slotted region, enablingstrong light-matter interactions. Here we demonstrate an ultrahigh-Q slotted 2Dphotonic crystal cavity for the purpose of obtaining strong interaction betweenthe internal light field and the mechanical motion of the slotted structure.The experimentally measured optical quality factor is Q=1.2x10^6 for a cavitywith a simulated effective optical modal volume of 0.04 cubic wavelengths.Optical transduction of the thermal Brownian motion of the fundamental in-planemechanical resonance of the slotted structure (151 MHz) is performed, fromwhich an optomechanical coupling of 140 GHz/nm is inferred for an effectivemotional mass of 20 pg. Dynamical back-action of the optical field on themechanical motion, resulting in both cooling and amplication of the mechanicalmotion, is also demonstrated.

Optomechanics in an ultrahigh-Q slotted 2D photonic crystal cavity