Optical buffer performance enhancement using Particle Swarm Optimization in Ring-Shape-Hole Photonic Crystal Waveguide

Ring-Shape-Hole Photonic Crystal Waveguides (RSHPCW) is a popular structure in designing optical buffers attracted many attentions recently. There are some parameters such as the radii of holes and pillars next to the defect that have significant effects on slow light properties. Consequently, one of the promising methods for effectively slowing the light speed down and controlling dispersion is to optimize these parameters, which is the motivation of this study. Particle Swarm Optimization (PSO) algorithm is one of the best proposed heuristic optimization algorithms in Artificial Intelligence applied to many engineering problem. In this work, this algorithm is employed to find the best values of the aforementioned radii for maximizing Normalized Delay-Bandwidth Product (NDBP) of RSHPCW structure as the first systematic optimizer. Calculation results show that there are 34% and 41% improvement in NDBP and bandwidth compared to the previous works, very substantial achievements in this area.