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Proceedings Paper

Chemical sensor applications of whispering-gallery modes resonances of thin capillaries with submicrometric wall
Author(s): Vanessa Zamora; Antonio Díez; Miguel V. Andrés; Benito Gimeno
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Paper Abstract

Microcapillary resonators have great potential in sensors applications due to their high sensitivity and compatibility with micro-fluidic systems. Capillaries show the unique property of being capable to sense liquids with refractive index higher than the refractive index of the capillary. Whispering-gallery modes resonances excited in the capillary shift as a function of the refractive index of the medium that fills the capillary. The sensitivity, as well as the Q factor of the resonances, depends strongly on the structural parameters of the capillary, i.e. radius and wall thickness. A detailed theoretical analysis is presented. As a practical application, capillaries were used for the measurement of glucose concentration in water solution. A collection of capillaries with different wall thickness and radius were tested. The sensitivity of higher radial-order modes in large radius capillaries is also investigated. A best sensitivity of 1.24 nm / % of glucose concentration in water is reported.

Paper Details

Date Published: 18 May 2009
PDF: 8 pages
Proc. SPIE 7356, Optical Sensors 2009, 73560Z (18 May 2009); doi: 10.1117/12.820379
Show Author Affiliations
Vanessa Zamora, Univ. de Valencia (Spain)
Antonio Díez, Univ. de Valencia (Spain)
Miguel V. Andrés, Univ. de Valencia (Spain)
Benito Gimeno, Univ. de Valencia (Spain)


Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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