A Refractive Index Nanosensor Based on Fano Resonance in the Plasmonic Waveguide System

Author

Zhao Chen ; Li Yu ; Lulu Wang ; Gaoyan Duan ; Yufang Zhao ; Jinghua Xiao

Author_Institution

State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China

Volume

27

Issue

16

fYear

2015

fDate

Aug.15, 15 2015

Firstpage

1695

Lastpage

1698

Abstract

A novel and compact refractive index sensor based on Fano resonance in the plasmonic waveguide system, which comprises with a stub and groove resonator coupled with a metal-insulator-metal waveguide, is proposed and investigated by the finite-element method. Due to the interaction of the narrow discrete resonance and a broad spectrum caused by the stub resonator and the groove, respectively, the transmission spectrum exhibits a sharp asymmetrical profile. Simulation results show that the Fano resonance can be easily tuned by changing the parameters of the structure. These characteristics offer flexibility to design the devices. This nanosensor yields a sensitivity of ~1260 nm/RIU and a figure of merit of ~2.3 × 10⁴. This letter is significant for design and application of the sensitive nanoscale refractive index sensor.

Keywords

MIM devices; finite element analysis; nanophotonics; nanosensors; optical resonators; optical sensors; optical waveguides; plasmonics; refractive index measurement; Fano resonance; design flexibility; finite element method; groove resonator; metal-insulator-metal waveguide; narrow discrete resonance; plasmonic waveguide system; refractive index nanosensor; sensitivity; sharp asymmetrical profile; stub resonator; Optical resonators; Optical waveguides; Optimized production technology; Plasmons; Refractive index; Shape; Fano resonances; Figure of merit; MIM waveguide; Plasmonic; Sensor; figure of merit; sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2437850

Filename

7118673