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

Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system

Xiaobin Ren, Kun Ren, and Yuanxue Cai
Appl. Opt. 56(31) H1-H9 (2017)

Nanosensor and slow light based on quintuple Fano resonances in a metal–insulator–metal waveguide coupled with a concentric-ring resonator

F. Chen and W. X. Yang
J. Opt. Soc. Am. B 40(4) 736-742 (2023)

Fano resonances in a single defect nanocavity coupled with a plasmonic waveguide

Jianjun Chen, Chengwei Sun, and Qihuang Gong
Opt. Lett. 39(1) 52-55 (2014)

Refractive index sensor based on multiple Fano resonances in a plasmonic MIM structure

Zhengfeng Li, Kunhua Wen, Li Chen, Liang Lei, Jinyun Zhou, Dongyue Zhou, Yihong Fang, and Bingye Wu
Appl. Opt. 58(18) 4878-4883 (2019)

Tunable all-optical plasmonic diode based on Fano resonance in nonlinear waveguide coupled with cavities

Cairong Fan, Fenghua Shi, Hongxing Wu, and Yihang Chen
Opt. Lett. 40(11) 2449-2452 (2015)