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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 7 — Aug. 1, 2013

Ultrasensitive real-time measurement of dissipation and dispersion in a whispering-gallery mode microresonator

Joachim Knittel, Jong H. Chow, Malcolm B. Gray, Michael A. Taylor, and Warwick P. Bowen  »View Author Affiliations

Optics Letters, Vol. 38, Issue 11, pp. 1915-1917 (2013)

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We present the characterization of the recently developed cavity enhanced amplitude modulation laser absorption spectroscopy (CEAMLAS) technique to measure dissipation within the evanescent field of a whispering-gallery mode resonator, and demonstrate the parallel use of CEAMLAS and the Pound–Drever–Hall measurement techniques to provide both dissipation and dispersive real-time microresonator measurements. Using an atomic force microscope tip, we introduce a controlled perturbation to the evanescent field of the resonator. In this case, dissipative sensing allows up to 16.8 dB sensitivity improvement over dispersive measurements, providing the possibility for enhanced sensitivity in application such as biomolecule detection.

© 2013 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(230.5750) Optical devices : Resonators
(140.3945) Lasers and laser optics : Microcavities
(240.3990) Optics at surfaces : Micro-optical devices

ToC Category:
Optical Devices

Original Manuscript: April 1, 2013
Revised Manuscript: April 28, 2013
Manuscript Accepted: April 29, 2013
Published: May 27, 2013

Virtual Issues
Vol. 8, Iss. 7 Virtual Journal for Biomedical Optics

Joachim Knittel, Jong H. Chow, Malcolm B. Gray, Michael A. Taylor, and Warwick P. Bowen, "Ultrasensitive real-time measurement of dissipation and dispersion in a whispering-gallery mode microresonator," Opt. Lett. 38, 1915-1917 (2013)

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