Theoretical analysis of ultrahigh figure of merit sensing in plasmonic waveguides with a multimode stub

• DOI: 10.1364/ol.41.005206
• Publication Date: 2016-11-03T20:56:31Z
• Authors: Zhihui He; Hongjian Li; Boxun Li; Zhiquan Chen; Hui Xu; Mingfei Zheng
• Keywords: Figure of Merit; Stub (electronics); Nanosensor; Coupled mode theory

We propose an expanded coupled mode theory to analyze sensing performance in a plasmonic slot waveguide side-coupled with multimode stub resonator. It is confirmed by the finite-difference time-domain simulations. Through adjusting parameters, we can realize figure of merit (FOM) ∼59,010, and sensitivity S reach 75.7. Compared systems recent Letters, our proposed structure has advantages easy fabrication, compactness, sensitivity, high FOM. The model findings provide guidance for fundamental research integrated nanosensor applications.