Abstract
Herein, the design for a tunable plasmonic refractive index nanosensor is presented. The sensor is composed of a metal–insulator–metal waveguide with a baffle and a circular split-ring resonator cavity. Analysis of transmission characteristics of the sensor structures was performed using the finite element method, and the influence of the structure parameters on the sensing characteristics of the sensor is studied in detail. The calculation results show that the structure can realize dual Fano resonance, and the structural parameters of the sensor have different effects on Fano resonance. The peak position and the line shape of the resonance can be adjusted by altering the sensitive parameters. The maximum value of structural sensitivity was found to be 1114.3 nm/RIU, with a figure of merit of 55.71. The results indicate that the proposed structure can be applied to optical integrated circuits, particularly in high sensitivity nanosensors.
Highlights
Surface plasmon polaritons (SPPs) are the electromagnetic wave modes spread along the metal surface [1,2]
The Fano resonance was caused by the of the MIM baffle and the circular split-ring resonance cavity (CSRRC); the peak intensity and line shape of the Fano resonance resonance affected by theand geometric parameters of the structure
We further studied theof influence coupling was of the MIM baffle the CSRRC; the peak intensity and line shape the Fano was affected by the geometric parameters of the structure
Summary
Surface plasmon polaritons (SPPs) are the electromagnetic wave modes spread along the metal surface [1,2]. Sensors 2019, 19, 791 number of refractive-index sensor structures based on Fano resonance have been reported [24,25,26,27,28] This includes a plasmonic Fano system consisting of a stub and a square-cavity resonator with a peak sensitivity of 938 nm/RIU, and the obtained FOM* is approximately 1.56 × 105 [23]. The proposed sensor is composed of a baffle coupled with a circular split-ring resonance cavity (CSRRC) Both the transmission spectra and magnetic field distribution of the sensing system are simulated using the COMSOL. The influence of structural parameters, such as the splitting size of CSRRC, the outer radius of CSRRC, and the silver baffle width, on the sensing characteristics is studied
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