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22 February 2018 Absorption sensing enhancement in a microresonator coupled to a non-adiabatic tapered fiber
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Whispering-gallery microresonators are well suited for use as sensors. For example, fluid analytes can be sensed through their effect on the refractive index or by their optical absorption. The former results in a frequency shift of a whispering-gallery mode (WGM); the latter changes the WGM’s intensity profile, and can be even more sensitive than the former. WGMs are typically excited by coupling of light from a tapered fiber. It has recently been demonstrated that using a non-adiabatic tapered fiber can produce a Fano resonance whose asymmetric shape can enhance the sensitivity of refractive-index sensing. The non-adiabatic taper allows the incoming light to be distributed between two fiber modes that interfere when exciting a single WGM, thereby producing the asymmetric resonance. However, just as absorption sensing can be more sensitive than index sensing, its enhancement by using a non-adiabatic taper can be greater as well. This enhancement is demonstrated theoretically here, and experiments for confirmation are underway.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. T. Rosenberger "Absorption sensing enhancement in a microresonator coupled to a non-adiabatic tapered fiber", Proc. SPIE 10548, Steep Dispersion Engineering and Opto-Atomic Precision Metrology XI, 105480G (22 February 2018);

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