Design of high-sensitive plasmonic sensors with circle-semi-ring coupled resonators

摘要

A novel design for a plasmonic sensor, consisting of a metal-insulator-metal waveguide with a coupled circle-semi-ring resonator is proposed and investigated in this paper. We carried out the theoretical analysis for the wave-guiding characteristics by utilizing the two-dimensional (2D) finite-difference time-domain method. The effects of the electromagnetic wave transmission, field profile distribution, temperature and refractive index (RI) sensing characteristics on the structural parameters were studied in detail. The simulation results indicate that proposed sensor possesses a RI sensitivity up to 990 nm/refractive index unit and a temperature sensitivity of - 0.42 nm/ DEG;C with optimized geometric parameters. The compact waveguide structure may be widely utilized in areas of sensing and integrated circuits.