Triple-channel glasses-shape nanoplasmonic demultiplexer based on multi nanodisk resonators in MIM waveguide

Abstract

In this paper a metal-insulator-metal (MIM) plasmonic waveguide is proposed. Based on the proposed MIM waeguide and nanodisk resonators a novel 1*3 wavelength demultiplexer (WDM) structure is designed. The proposed WDM structure is based on three plasmonic filters. Each of this plasmonic filters consists of two waveguides (input and drop), and a middle cavity that are coupled with nanodisk resonators horizontally. Using these proposed plasmonic filters a three channel plasmonic demultiplexer also designed and simulated in this paper. By seting suitable values for the designed structural parameters (refractive index and geometric parameters), the structure output can be modified and adjusted in a controlled. According to the simulation results of the plasmonic demultiplexer structure, the transmission efficiency of one of the channels reaches about 80 % and The effect of cross talk is less than -23 dB. There are three different wavelengths for each channel in this proposed WDM structure. It is also notable that, 2D Finite-Difference Time-Domain (FDTD) numerical method is imployed in this paper. Large-scale photonic integration, the ultra-compact demultiplexer devices, ultra-compact demultiplexer devices, the development of optical integrated circuits and integrated plasmonic devices are among of the application that the proposed structure can be used in them.