High sensitive refractive index sensor in a graphene-based nanoribbon waveguide system based on the finite-difference time-domain method

摘要

A nanometric and high sensitive refractive index sensor is proposed in a graphene-based nanoribbon waveguide coupled with graphene rectangular resonators structure based on the 3D finite-difference time-domain (FDTD) method. The results indicate that there exists one transmission window in the transmission spectrum, which is induced from the coupling effect between the electric dipole mode and quadrupole mode. Through optimization of the structural parameters, we can achieve a theoretical value of the refractive index sensitivity as high as 1800 nmRIU-1.