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A capillary-type fluorescent-core microcavity refractive index sensor based on whispering gallery mode (WGM) resonances is presented. The device consists of a glass microcapillary with a thin layer of fluorescent silicon quantum dots (QDs) coated on the channel surface. The high index of the QD layer confines the electric field near the capillary channel and causes the development of WGMs in the fluorescence spectrum. Refractometric sensing was achieved in these fluorescent-coredoi:10.1364/oe.19.021540 pmid:22109003 fatcat:x6wjstf4uvgjfoksg52zmbwz24