Analysis of whispering-gallery microcavity-enhanced chemical absorption sensors | Zendy

A. T. Rosenberger | Zendy

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Analysis of whispering-gallery microcavity-enhanced chemical absorption sensors

Author(s) -

A. T. Rosenberger

Publication year - 2007

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.15.012959

Subject(s) - whispering gallery wave , optics , materials science , absorbance , absorption (acoustics) , broadband , cavity ring down spectroscopy , sensitivity (control systems) , whispering gallery , optoelectronics , optical path , dielectric , absorption spectroscopy , resonator , drop (telecommunication) , analyte , physics , chemistry , telecommunications , electronic engineering , computer science , engineering

A theoretical analysis of the operation of a chemical sensor based on cavity-enhanced optical absorption is given for a system in which the cavity is a dielectric whispering-gallery microresonator. Continuous-wave input is assumed, and the detection sensitivity is characterized in terms of an effective absorption path length. In the case of tunable single-frequency input, it is shown that monitoring analyte-induced changes in the throughput dip depth enables detection with relative sensitivity greater than that of frequency-shift and cavity-ringdown methods. In addition, for the case of broadband input and drop-port output, an analysis applicable to microcavity-enhanced absorbance spectroscopy experiments is given.

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