Utilization of binary PSO algorithm and DDA method to investigate the plasmonic demultiplexer -based CPA filter

Abstract

Here, we suggest the possibility of optical circuit design approach by employing the binary optimization of plasmonic nano disks. The proposed mechanism is based on combination of binary particle swarm optimization (BPSO) algorithm and discrete dipole approximation (DDA) method. BPSO, a group of birds including a matrix with binary entries responsible for controlling nano disks in the array, shows the presence with symbol of (‘1’) and the absence with (‘0’). The current research represents a nanoscale and compact 4 channels plasmonic Demultiplexer as optical circuit. It includes 8 coherent perfect absorption (CPA) –type filters. The operation principle is based on the absorbable formation of a conductive path in the dielectric layer of a plasmonic nano-disks waveguide. Since the CPA efficiency depends strongly on the number of plasmonic nano-disks and the nano disks location, an efficient binary optimization method based the BPSO algorithm is used to design an optimized array of the plasmonic nano-rod in order to achieve the maximum absorption coefficient in the ‘off’ state.