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Type: Journal article
Title: Refractometry with ultralow detection limit using anisotropic whispering-gallery-mode resonators
Author: Weng, W.
Anstie, J.
Luiten, A.
Citation: Physical Review Applied, 2015; 3(4):044015-1-044015-6
Publisher: American Physical Society
Issue Date: 2015
ISSN: 2331-7019
Statement of
Wenle Weng, James D. Anstie, and Andre N. Luiten
Abstract: The intrinsic sensitivity of whispering-gallery-mode resonators aimed at measuring refractive index can be extremely high, although their practical performance is compromised by temperature fluctuations that masquerade as refractive-index changes. We present a triple-mode approach that delivers simultaneous and independent sensing of temperature and refractive-index changes in the same resonator. The frequency difference between two orthogonally polarized modes is used to sense temperature which is then actively stabilized to ∼1  μK over 15 minutes. We then detect a frequency difference between two modes of different wavelengths to obtain a refractive-index measurement that is free of temperature fluctuations. This triple-mode technique delivers a state-of-the-art detection limit of 8×10¯⁹ refractive-index units, despite the resonator size being 100 times larger than that typically used for sensitive refractometric sensing.
Rights: © 2015 American Physical Society
RMID: 0030029172
DOI: 10.1103/PhysRevApplied.3.044015
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Appears in Collections:IPAS publications

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