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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 20 — Oct. 1, 2007
  • pp: 12959–12964

Analysis of whispering-gallery microcavity-enhanced chemical absorption sensors

A. T. Rosenberger  »View Author Affiliations

Optics Express, Vol. 15, Issue 20, pp. 12959-12964 (2007)

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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.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.5750) Optical devices : Resonators
(300.1030) Spectroscopy : Absorption
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 13, 2007
Revised Manuscript: September 15, 2007
Manuscript Accepted: September 17, 2007
Published: September 24, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

A. T. Rosenberger, "Analysis of whispering-gallery microcavity-enhanced chemical absorption sensors," Opt. Express 15, 12959-12964 (2007)

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  1. A. B. Matsko and V. S. Ilchenko, "Optical Resonators with Whispering-Gallery Modes - Part I: Basics," IEEE J. Sel. Top. Quantum Electron. 12, 3-14 (2006). [CrossRef]
  2. V. S. Ilchenko and A. B. Matsko, "Optical Resonators with Whispering-Gallery Modes - Part II: Applications," IEEE J. Sel. Top. Quantum Electron. 12, 15-32 (2006). [CrossRef]
  3. I. Teraoka, S. Arnold, and F. Vollmer, "Perturbation approach to resonance shifts of whispering-gallery modes in a dielectric microsphere as a probe of a surrounding medium," J. Opt. Soc. Am. B 20, 1937-1946 (2003). [CrossRef]
  4. N. M. Hanumegowda, C. J. Stica, B. C. Patel, I. White and X. Fan, "Refractometric sensors based on microsphere resonators," Appl. Phys. Lett. 87, 201107 (2005). [CrossRef]
  5. A. M. Armani and K. J. Vahala, "Heavy water detection using ultra-high-Q microcavities," Opt. Lett. 31, 1896-1898 (2006). [CrossRef] [PubMed]
  6. A. A. Savchenkov, A. B. Matsko, M. Mohageg, and L. Maleki, "Ringdown spectroscopy of stimulated Raman scattering in a whispering gallery mode resonator," Opt. Lett. 32, 497-499 (2007). [CrossRef] [PubMed]
  7. R. W. Boyd and J. E. Heebner, "Sensitive disk resonator photonic biosensor," Appl. Opt. 40, 5742-5747 (2001). [CrossRef]
  8. M. J. Humphrey, E. Dale, A. T. Rosenberger, and D. K. Bandy, "Calculation of optimal fiber radius and whispering-gallery mode spectra for a fiber-coupled microsphere," Opt. Commun. 271, 124-131 (2007). [CrossRef]
  9. M. L. Gorodetsky and V. S. Ilchenko, "Optical microsphere resonators: optimal coupling to high-Q whispering-gallery modes," J. Opt. Soc. Am. B 16, 147-154 (1999). [CrossRef]
  10. M. Cai, O. Painter, and K. J. Vahala, "Observation of Critical Coupling in a Fiber Taper to a Silica-Microsphere Whispering-Gallery Mode System," Phys. Rev. Lett. 85, 74-77 (2000). [CrossRef] [PubMed]
  11. G. Farca, S. I. Shopova, and A. T. Rosenberger are preparing a manuscript to be called "Cavity-enhanced laser absorption spectroscopy using microresonator whispering-gallery modes."
  12. M. L. Gorodetsky and V. S. Ilchenko, "High-Q optical whispering-gallery microresonators: precession approach for spherical mode analysis and emission patterns with prism couplers," Opt. Commun. 113, 133-143 (1994). [CrossRef]
  13. J. Zhang, B. N. Strecker, R. K. Shelton, S.-J. Ja, J. V. Hryniewicz, and A. T. Rosenberger are preparing a manuscript to be called "A broadband whispering-gallery mode microsphere absorbance spectrometer."
  14. S. L. Westcott, J. Zhang, R. K. Shelton, N. M. K. Bruce, S. Gupta, S. L. Keen, J. W. Tillman, L. B. Wald, B. N. Strecker, A. T. Rosenberger, R. R. Davidson, W. Chen, K. G. Donovan, and J. V. Hryniewicz are preparing a manuscript to be called "Broadband optical absorbance spectroscopy using a whispering gallery mode microsphere resonator."

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