High bandwidth on-chip capacitive tuning of microtoroid resonators
  We report on the design, fabrication and characterization of silica microtoroid based cavity opto-electromechanical systems (COEMS). Electrodes patterned onto the microtoroid resonators allow for rapid capacitive tuning of the optical whispering gallery mode resonances while maintaining their ultrahigh quality factor, enabling applications such as efficient radio to optical frequency conversion, optical routing and switching applications. 
Christopher G. Baker, Christiaan Bekker, David L. McAuslan, Eoin   Sheridan, Warwick P. Bowen
physics.optics