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We demonstrate highly efficient coupling of light from an optical fiber to asilicon photonic crystal optomechanical cavity. The fiber-to-cavity couplingutilizes a compact (L ~ 25 um) intermediate adiabatic coupler. The opticalcoupling is lithographically controlled, broadband, relatively insensitive tofiber misalignment, and allows for light to be transferred from an opticalfiber to, in principle, any photonic chip with refractive index greater thanthat of the optical fiber. Here we demonstrate single-sided cavity couplingwith a total fiber-to-cavity optical power coupling efficiency of 85%.

Highly efficient coupling from an optical fiber to a nanoscale silicon optomechanical cavity