Improved optomechanical disk resonator sitting on a pedestal mechanical   shield
  We experimentally demonstrate the controlled enhancement of the mechanical quality factor Q of GaAs disk optomechanical resonators. Disks vibrating at 1.3 GHz with a mechanical shield integrated in their pedestal show a Q improvement by a factor 10 to 16. The structure is modeled numerically and different modes of vibration are observed, which shed light on the Q enhancement mechanism. An optimized double-disk geometry is presented that promises Q above the million for a large parameter range. 
Dac Trung Nguyen, William Hease, Christopher Baker, Eduardo   Gil-Santos, Pascale Senellart, Aristide Lema\^itre, Sara Ducci...
cond-mat.mes-hall physics.optics