Refractive Index Sensing Based on the Fano Resonance of A Single Slot Waveguide Microring Resonator
The asymmetry and narrow linewidth properties of the Fano line shape are conducive to the realization of refractive-index sensing with high sensitivity and low detection limit.In this study,the coupled structure of the microring resonator and the Fabry-Perot cavity was designed based on the slot waveguide,using the three-dimensional time-domain finite-difference method.The Fano line shape resonance was realized and utilized to improve the performance of refractive index sensors.In contrast to reported complex structures such as multiple micro-ring cascades,a sensitivity of 500 nm/RIU and detection limit of 4.00×10-5 RIU were achieved under the wavelength tracking scheme based on the Fano lineshape resonance of the single-slot waveguide microring resonator.The sensitivity was 7.24X104 dB/RIU for a detection limit of 5.52X10-6 RIU under the intensity tracking scheme.
Integrated sensorsslot waveguidemicroring resonatorFanorefractive index sensing
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