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Opt Express. 2010 Feb 1;18(3):2967-72. doi: 10.1364/OE.18.002967.

Highly sensitive silicon microring sensor with sharp asymmetrical resonance.

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State Key Laboratory on Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.


We analyze the resonance spectrum in silicon microring resonators taking into account the end-facet reflection from a coupled waveguide, which can provide a dense set of Fabry-Perot resonances. Based on the simple configuration of a microring coupled with a waveguide, the resulting asymmetric Fano-like non-Lorentzian resonance is obtained by scattering theory and experiment. Enhanced sensing performance with steeper slope to the resonance is theoretically predicted and experimentally demonstrated for a 10-microm racetrack silicon microring resonator. A high sensitivity of approximately 10(-8) RIU in terms of the detection limit is obtained in a 30-dB signal-to-noise ratio (SNR) system.

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