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

Authors :
Francois, Alexandre
Michael Himmelhaus
Source :
Sensors (14248220). 2009, Vol. 9 Issue 9, p6836-6852. 17p. 2 Charts, 6 Graphs.
Publication Year :
2009

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14248220
Volume :
9
Issue :
9
Database :
Academic Search Index
Journal :
Sensors (14248220)
Publication Type :
Academic Journal
Accession number :
44623003
Full Text :
https://doi.org/10.3390/s90906836