Construction and Evaluation of Plasmonic Refractive Index Sensors Based on Dimensional Change and Number of Resonators

In this paper, a plasmonic refractive index sensor based on metal insulated metal waveguide (MIM) with two plasmonic waveguides and five rings and two teeth and four rectangular cavities is proposed and designed. The resonant wavelengths and refractive index of the resonators will be investigated by the time domain finite difference method. To achieve an optical sensor with excellent quality and performance, we change the number and type of amplifiers and their dimensions. In each step of the simulation, we change the refractive index of the middle ring located in the middle of the two waveguides and the refractive index of the other resonators remains constant. This challenge will help to form a more appropriate structure for optical sensors. The sensor built in this simulation has a balanced and suitable function for integrated circuits and helps researchers to better understand the design of plasmonic structures. It also has wide applications in biomedical research, healthcare, pharmaceuticals, environmental monitoring, internal security and battlefield