Fluorescent-core microcavity sensors employ a high-index quantum-dot coating in the channel of silica microcapillaries. Changes in the refractive index of fluids pumped into the capillary channel cause shifts in the microcavity fluorescence spectrum that can be used to analyze the channel medium.
McFarlane, S., Manchee, C., Silverstone, J. W., Veinot, J., Meldrum, A. Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing. J. Vis. Exp. (73), e50256, doi:10.3791/50256 (2013).