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25 February 2020 Enhanced dissipative sensing in a microresonator with multimode input (experiment)
Sreekul Raj Rajagopal, A. T. Rosenberger
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Proceedings Volume 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II; 112963Q (2020) https://doi.org/10.1117/12.2556503
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Optical whispering-gallery mode (WGM) microresonators have proven their ability to enhance light-matter interaction and hence are widely used for sensing. In contrast to the traditional approach of using symmetric adiabatic tapers to couple light into the resonators, we use an asymmetric non-adiabatically tapered fiber to couple light from two fiber modes into a microresonator. Previously it was shown that dissipative sensing of an absorbing analyte can be more sensitive than dispersive sensing, and that dissipative sensing based on dip depth change can be more sensitive than dissipative sensing based on linewidth change. In this report, we demonstrate an enhancement in sensitivity by three orders of magnitude for dissipative sensing based on dip depth change. The enhancement factor is independent of the quality factor Q of the WGM and is determined solely by the values of the throughput power in the absence of analyte when the two fiber modes are in and out of phase at the point where they couple into the WGM.
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Sreekul Raj Rajagopal and A. T. Rosenberger "Enhanced dissipative sensing in a microresonator with multimode input (experiment)", Proc. SPIE 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, 112963Q (25 February 2020); https://doi.org/10.1117/12.2556503
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KEYWORDS
Microresonators
Resonators
Sensors
Absorption
Optical fibers
Optical sensors
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