Quasi-2d Optomechanical Crystal Cavity for Quantum Optomechanics

We present the design and characterization of a quasi-two-dimensional op-tomechanical crystal cavity. At a refrigerated temperature of 10 mK, an intrinsic mechanical quality factor of 1.2 billion is observed and an effective quantum cooperativity greater than unity is realized under steady-state optical pumping. © 2019 The Author(s)