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

Received: 7 August 2009; in revised form: 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)
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.
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
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MDPI and ACS Style

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.

AMA Style

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

Chicago/Turabian Style

Francois, Alexandre; Himmelhaus, Michael. 2009. "Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate." Sensors 9, no. 9: 6836-6852.

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