2-D optical/opto-mechanical microfluidic sensing with micro-bubble resonators.

Optics express

PubMedID: 26191827

Chen Z, Li M, Wu X, Liu L, Xu L. 2-D optical/opto-mechanical microfluidic sensing with micro-bubble resonators. Opt Express. 2015;23(14):17659-64.
In this paper a new sensing scheme by simultaneously measuring optical refractive index change and sound speed change in an optofluidic thin wall micro-bubble resonator is reported. Sensitivity of sound speed is 4. 2-6. 8 MHz/ (km/s) for 3 types of mechanical modes. A 2-D optical/opto-mechanical sensing map is plotted by detecting both the whispering gallery mode resonance shift and the optomechanical resonance shift. This novel scheme provides a supplementary support to optical sensing when analytes do not respond to refractive index (RI) change.