Plasmonic nanosensor based on multiple independently tunable Fano resonances

• DOI: 10.3762/bjnano.10.243
• Publication Date: 2019-12-17T09:37:36Z
• Authors: Lin Cheng; Zelong Wang; Xiaodong He; Pengfei Cao
• Keywords: Nanosensor; Fano resonance

A novel refractive index nanosensor with compound structures is proposed in this paper. It consists of three different kinds resonators and two stubs which are side-coupled to a metal-dielectric-metal (MDM) waveguide. By utilizing numerical investigation the finite element method (FEM), simulation results show that transmission spectrum has as many five sharp Fano resonance peaks. Due their mechanisms, each peak can be independently tuned by adjusting corresponding parameters structure. In addition, sensitivity found up 1900 nm/RIU. For practical application, legitimate combination various components, such T-shaped, ring, split-ring cavities, been dramatically reduces dimensions without sacrificing performance. These design concepts pave way for construction compact on-chip plasmonic structures, widely applied nanosensors, optical splitters, filters, switches, nonlinear photonic slow-light devices.