Investigating the optical AND gate using plasmonic nano-spheres

Abstract

In this paper, a coherent perfect absorption (CPA)-type AND gate based on plasmonic nano particles is proposed. It consists of two gold nano sphere arrays on top of two serial arms with quartz substrate. The operation principle is based on the absorbable formation of a conductive path in the dielectric layer of a plasmonic nano-particle waveguide. Since the CPA efficiency depends strongly on the number of gold nano-sphere and the locations of nano-spheres, an efficient binary optimization method based the Particle Swarm Optimization (PSO) algorithm is used to design an optimized array of the plasmonic nano-sphere in order to achieve the maximum absorption coefficient in the `off' state and the minimum absorption coefficient in the `on' state. In Binary PSO, a group of birds consists a matrix with binary entries, control the presence (`1') or the absence (`0') of nano sphere in the array.