A highly-sensitive optical sensor comprising of two cascaded microring resonators with Vernier effect is investigated theoretically. It is shown that a refractive index change in the order of 10-7RIU can be measured from the relative intensities of two adjacent modes.
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L. Jin, M. Li, and J. He, "Highly-Sensitive Optical Sensor Using Two Cascaded-Microring Resonators with Vernier Effect," in Asia Communications and Photonics Conference and Exhibition, Technical Digest (CD) (Optical Society of America, 2009), paper TuM4.
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