Highly sensitive tuning of coupled optical ring resonators by microfluidics
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The authors develop optofluidic coupled ring resonator (OCRR) system in which one of the ring resonators serves as a microfluidic channel. Highly sensitive tuning of the OCRR is demonstrated by making small changes in the refractive index of the fluid. A refractometric sensing scheme using the OCRR is proposed and demonstrated, allowing for measuring a refractive index change down to 10−9 refractive index units, two orders of magnitude better than a single ring resonator.
KeywordsCoupled resonators Microfluidics Sensing
The authors acknowledge the support from the Wallace Coulter Foundation Early Career Award and National Science Foundation-CAREER (CBET-0747398).