Dual-microring-resonator interference with the microrings on separate arms of a Mach–Zehnder interferometer is shown to provide the basis for high-performance sensors. The output spectrum, which depends on the overlap of the resonances of the two microring resonators, depends sensitively on the resonance shift of one of the microrings due to the presence of an analyte. The sensitivity and detection limit are obtained theoretically and found to be as large as 0.31 nm overlap resonance shift according to 2×10−6 refractive index units for Si-based sensors.
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Yi et al. (2009) studied this question.
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