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18 May 2009 Chemical sensor applications of whispering-gallery modes resonances of thin capillaries with submicrometric wall
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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.
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Vanessa Zamora, Antonio Díez, Miguel V. Andrés, and Benito Gimeno "Chemical sensor applications of whispering-gallery modes resonances of thin capillaries with submicrometric wall", Proc. SPIE 7356, Optical Sensors 2009, 73560Z (18 May 2009); https://doi.org/10.1117/12.820379
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