Visible photonic switch based on tunable 2D ferromagnetic photonic crystal

The aim of the paper is to propose an idea of photonic switch using 2D magnetic photonic crystal (Magneto-PC) structures, which is made of ferromagnetic material. The photonic switch is controlled by an external magnetic field under two magnetization conditions in the hysteresis curve: (1) the saturation magnetization (labeled as the Bs point in the hysteresis curve); and (2) non-magnetization state (labeled as the Hc point in the hysteresis curve). The design of the 2D Magneto-PC consists of three rows of one dimensional array of ferromagnetic rods, called the "3-by-N structure". The variations in the transmission rate and the reflection rate at wavelength 650 nm for the TE and the TM waves, respectively, under these two magnetization conditions in the ferromagnetic hysteresis curve were observed. The simulation is carried out by the finite-difference time-domain (FDTD) method.