Abstract

We propose a plasmonic nanosensor based on Fano resonance in the strong-confinement metal–dielectric–metal waveguide side-coupled with a pair of nanoresonators. Due to the coherent interference of the splitting discrete and quasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which is dependent on the cavity–cavity phase and the refractive index change of the dielectric. The physical features contribute to a highly efficient plasmonic sensor for refractive index sensing. The nanosensor yields a sensitivity of $\sim 900\mathrm{nm}/\mathrm{RIU}$ and a figure of merit of $\sim 500$, remarkable values compared with those of plasmonic sensors supported by perfect absorbers.

© 2012 Optical Society of America

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