Scientific Results

Phase-shift cavity ring-down spectroscopy on a microsphere resonator by Rayleigh backscattering

Year: 2013

Authors: Barnes J. A., Gagliardi G., Loock H-P.

Autors Affiliation: Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6;
CNR-Istituto Nazionale di Ottica (INO), via Campi Flegrei 34, Comprensorio A. Olivetti 80078 Pozzuoli (NA), Italy

Abstract: The optical ring-down time in a silica microsphere resonator is measured using phase-shift cavity ring-down spectroscopy. When detecting Rayleigh backscattered light that is coupled into the input waveguide it is found that the shift of the modulation phase angle, Delta phi, is approximately linearly dependent on the amplitude modulation frequency. The microresonator therefore behaves as if it was a delay line. A model involving two different time scales for the buildup of the Rayleigh backscattered light and the decay of the whispering gallery modes is used to explain the observations.

Journal/Review: PHYSICAL REVIEW A

Volume: 87 (5)      Pages from: 053843  to: 053843

More Information: The authors thank Saverio Avino for his help in setting up the Pound-Drever-Hall locking scheme. We also thank Queen\’s University and the Natural Sciences and Engineering Research Council (NSERC) of Canada for funding.
KeyWords: Backscattered light; Cavity ring-down spectroscopy; Different time scale; Micro resonators; Microsphere resonators; Phase angles; Rayleigh backscattering; Silica microspheres, Microspheres; Modulation; Phase shift; Phase shifters; Resonators; Silica; Spectroscopy; Backscattering
DOI: 10.1103/PhysRevA.87.053843

Citations: 12
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