Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate
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 simultane...
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2009-08-01
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Online Access: | http://www.mdpi.com/1424-8220/9/9/6836/ |
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doaj-ead3aa559698435e91981ca6bdaca56b2020-11-25T00:06:34ZengMDPI AGSensors1424-82202009-08-01996836685210.3390/s90906836Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of SubstrateAlexandre FrancoisMichael HimmelhausWhispering 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. http://www.mdpi.com/1424-8220/9/9/6836/whispering gallery modescavity modesoptical sensingrefractive index sensingbiosensing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Alexandre Francois Michael Himmelhaus |
spellingShingle |
Alexandre Francois Michael Himmelhaus Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate Sensors whispering gallery modes cavity modes optical sensing refractive index sensing biosensing |
author_facet |
Alexandre Francois Michael Himmelhaus |
author_sort |
Alexandre Francois |
title |
Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate |
title_short |
Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate |
title_full |
Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate |
title_fullStr |
Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate |
title_full_unstemmed |
Optical Sensors Based on Whispering Gallery Modes in Fluorescent Microbeads: Size Dependence and Influence of Substrate |
title_sort |
optical sensors based on whispering gallery modes in fluorescent microbeads: size dependence and influence of substrate |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2009-08-01 |
description |
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. |
topic |
whispering gallery modes cavity modes optical sensing refractive index sensing biosensing |
url |
http://www.mdpi.com/1424-8220/9/9/6836/ |
work_keys_str_mv |
AT alexandrefrancois opticalsensorsbasedonwhisperinggallerymodesinfluorescentmicrobeadssizedependenceandinfluenceofsubstrate AT michaelhimmelhaus opticalsensorsbasedonwhisperinggallerymodesinfluorescentmicrobeadssizedependenceandinfluenceofsubstrate |
_version_ |
1725421348815110144 |