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Type: Journal article
Title: Optical sensors based on whispering gallery modes in fluorescent microbeads: Size dependence and influence of substrate
Author: François, A.
Himmelhaus, M.
Citation: Sensors, 2009; 9(9):6836-6852
Publisher: Molecular Diversity Preservation International (MDPI)
Issue Date: 2009
ISSN: 1424-8220
Statement of
Alexandre Francois and Michael Himmelhaus
Abstract: Whispering gallery modes in surface-fixated fluorescent polystyrene microbeads are studied in view of their capability of sensing changes in the refractive index of the beads’ environment by exposing them to water/glycerol mixtures of varying composition. The mode positions are analyzed by simultaneous fitting for mode number, bead radius, and environmental index. Down to a diameter of 8 μm, the sensor response follows the index of the bulk solution very well. For smaller bead sizes, some deviations occur, in particular for fluid indices not too different from that of water, which might be attributed to the presence of the substrate.
Keywords: whispering gallery modes; cavity modes; optical sensing; refractive index sensing; biosensing
Rights: © 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (
RMID: 0020093184
DOI: 10.3390/s90906836
Appears in Collections:Physics publications

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