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Sensors 2009, 9(9), 6836-6852; doi:10.3390/s90906836
Article

Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate

1,2
 and
1,*
Received: 7 August 2009 / Revised: 20 August 2009 / Accepted: 20 August 2009 / Published: 31 August 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Japan)
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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 whispering gallery modes; cavity modes; optical sensing; refractive index sensing; biosensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Francois, A.; Himmelhaus, M. Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate. Sensors 2009, 9, 6836-6852.

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