Design and analysis of near infrared high sensitive metal-insulator-metal plasmonic bio-sensor

Abstract In this paper, a high sensitivity metal-insulator-metal (MIM) waveguide based plasmonic sensor, coupled by hexagonal ring resonator is proposed. The sensing characteristics of the device are analyzed finite-difference time-domain (FDTD) method embedded in commercial simulator R-Soft. From results, there linear relation between material’s refractive index and its wavelength resonances. Moreover, maximum S = 1743 nm/RIU for second mode it 836 first mode, corresponding resolution 5.73 × 10 −6 RIU 2 1.19 −5 1. proposed sensor can be implemented performance nano-sensors bio-sensing devices. positions transmission peaks easily manipulated adjusting inner side lengths resonator, making structure dynamically controllable band pass filter. addition, introducing another small within base decreased full width half (FWHM) resonance peak.