Abstract
In this paper, a coherent perfect absorption (CPA)-type NAND gate based on plasmonic nano particles is proposed. It consists of two plasmonic nano-sphere arrays on the top of two parallel 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 plasmonic nano-spheres and the locations of nano-spheres, an efficient binary optimization method based on the particle swarm optimization (PSO) algorithm is used to design an optimized array of the plasmonic nano-spheres 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 spheres in the array.
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