Journal
OPTICS LETTERS
Volume 37, Issue 18, Pages 3780-3782Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.003780
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Funding
- National Natural Science Foundation of China [10874239, 10604066]
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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 similar to 900 nm/RIU and a figure of merit of similar to 500, remarkable values compared with those of plasmonic sensors supported by perfect absorbers. (C) 2012 Optical Society of America
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