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Quasi-droplet microbubbles for high resolution sensing applications

2014; Optica Publishing Group; Volume: 22; Issue: 6 Linguagem: Inglês

10.1364/oe.22.006881

1094-4087

Yong Yang, Jonathan M. Ward, Síle Nic Chormaic,

Mechanical and Optical Resonators

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 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.