Phase-Shift Cavity Ring-Down Spectroscopy on a Microsphere Resonator by Rayleigh Backscattering
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Authors
Barnes, Jack A.
Gagliardi, Gianluca
Loock, Hans-Peter
Date
2016-03-04
Type
journal article
Language
en
Keyword
Wave Propagation Transmission and Absorption , Brillouin and Rayleigh Scattering , Other light scattering , Optical Waveguides and Couplers , Diffraction and Scattering
Alternative Title
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, φ, 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.