A Self‐Defocusing Effect in Series of Networks for Nano All‐Optical Switching

Abstract

AbstractA theoretical design of all‐optical switches based on series of networks (SNs) is proposed. With increment of the fractal generation, the density of loops () in networks, which can efficiently produce antiresonances, increases exponentially, increasing switching efficiency to a high level. To acquire superior performance of the switching efficiency, the nonlinear material with negative nonlinear refractive index was chosen to insert into the networks, inducing self‐defocusing effect and decreasing the transmission. Further, the SNs with a defective waveguide length create ultra‐strong photonic localization and reduce the threshold energy. The switching efficiency of just the third type of SN was calculated and found to be approximately 5.25 × 1026, which is nine orders of magnitude higher than that previously reported. The threshold energy of just the third type of SN is about , which is one order of magnitude lower than that reported previously. Moreover, the switching efficiency increases monotonously, and the threshold energy decreases rapidly with increasing fractal generation.