Realization of a high-resolution plasmonic refractive index sensor based on double-nanodisk shaped resonators

In this paper, a high-resolution plasmonic refractive index sensor using double-nanodisk-shaped resonators is proposed. The structure is numerically simulated using the finite-difference time-domain (FDTD) method. This sensor is highly suitable for biosensors applications due to the low limit of detection. The proposed sensor not only has maximum FoM of 294.8 RIU ^-1 and maximum refractive index sensitivity of 800 nm/RIU but also it has an excellent Q-factor as high as 309 and minimum FWHM as small as 2 nm. Many of these values are highest in comparison with the other reported works in this literature. Hence, it is a good candidate for biosensing applications due to structural simplicity and excellent sensing features.