High-Q, ultrathin-walled microbubble resonator for aerostatic pressure sensing.

  title={High-Q, ultrathin-walled microbubble resonator for aerostatic pressure sensing.},
  author={Yong Yang and Sunny Saurabh and Jonathan M. Ward and S{\'i}le Nic Chormaic},
  journal={Optics express},
  volume={24 1},
Sensors based on whispering gallery resonators have minute footprints and can push achievable sensitivities and resolutions to their limits. Here, we use a microbubble resonator, with a wall thickness of 500 nm and an intrinsic Q-factor of 10(7) in the telecommunications C-band, to investigate aerostatic pressure sensing via stress and strain of the material. The microbubble is made using two counter-propagating CO(2) laser beams focused onto a microcapillary. The measured sensitivity is 19 GHz… 

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