Abstract

Whispering gallery mode (WGM) microresonators (WGRs) are considered to be excellent candidates for high sensitivity sensing. Here, we report on a relatively new WGM structure, the microbubble, used as a high sensitivity sensor for internal aerostatic pressure [1]. In contrast to conventional WGRs, this structure is hollow and sensing occurs inside the resonator through the evanescent field of the WGMs. Therefore, microbubbles have distinct advantages for optofluidic integration compared to the solid WGRs [2].

© 2015 Japan Society of Applied Physics, Optical Society of America