Journal
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
Volume 9, Issue 2, Pages 149-158Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.photonics.2010.09.007
Keywords
Optical microcavities; Microcapillaries; Chemical sensors; Refractometer; Whispering-gallery modes
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A detailed theoretical analysis of the basic properties of whispering-gallery modes (WGM) of thin capillaries is presented. The sensitivity of the resonances, as well as the Q factor is analyzed as a function of the structural parameters of the capillary and the refractive index inside the capillary. A practical application where thin capillaries are used for the measurement of glucose concentration in water is presented as a chemical sensor demonstrator. A best sensitivity of 1.24 nm/% of glucose concentration in water is reported, which corresponds to more than 850 nm/RIU. Additionally, different experimental approaches are discussed to improve the sensitivity and the detection limit that can be achieved using thin capillaries. Using thin and large diameter microcapillaries, and using a tapered fiber with the proper diameter for the excitation of the WGM, we estimate that refractive index changes smaller than 10(-6) can be detected, maintaining an optimum compatibility with microfluidic systems. (C) 2010 Elsevier B.V. All rights reserved.
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