Plasmonic nanosensor based on Fano resonance in waveguide-coupled resonators

Hua Lu, Xueming Liu, Dong Mao, Guoxi Wang

Research output: Contribution to journalArticlepeer-review

379 Scopus citations

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 ∼900 nm/ RIU and a figure of merit of ∼500, remarkable values compared with those of plasmonic sensors supported by perfect absorbers.

Original languageEnglish
Pages (from-to)3780-3782
Number of pages3
JournalOptics Letters
Volume37
Issue number18
DOIs
StatePublished - 15 Sep 2012
Externally publishedYes

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