Quasi-droplet microbubbles for high resolution sensing applications

Yong Yang, Jonathan Ward, Síle Nic Chormaic
2014 Optics Express  
Optical properties and sensing capabilities of fused silica microbubbles were studied numerically using a finite element method. Mode characteristics, such as quality factor (Q) and effective refractive index, were determined for different bubble diameters and shell thicknesses. For sensing applications with whispering gallery modes (WGMs), thinner shells yield improved sensitivity. However, the Q-factor decreases with reduced thickness and this limits the final resolution. Three types of
more » ... hree types of sensing applications with microbubbles, based on their optimized geometrical parameters, were studied. Herein the so-called quasi-droplet regime is defined and discussed. It is shown that best resolution can be achieved when microbubbles act as quasi-droplets, even for water-filled cavities at the telecommunications C-band.
doi:10.1364/oe.22.006881 pmid:24664037 fatcat:euoaobutlfd6zdb6nwbu35hkrq