Adiabatic embedment of nanomechanical resonators in photonic microring   cavities
  We report a circuit cavity optomechanical system in which a nanomechanical resonator is adiabatically embedded inside an optical ring resonator with ultralow transition loss. The nanomechanical device forms part of the top layer of a horizontal silicon slot ring resonator, which enables dispersive coupling to the dielectric substrate via a tapered nanogap. Our measurements show nearly uncompromised optical quality factors (Q) after the release of the mechanical beam. 
Chi Xiong, Wolfram Pernice, Mo Li, Michael Rooks and Hong X. Tang
physics.optics cond-mat.mes-hall