FDTD simulation of time varying optical vortex phenomena in SOI photonic crystal structures

In this paper we analyze the time varying optical vortex phenomena in the gain photonic crystals built on the silicon-on-insulator (SOI) wafer by using the finite difference time domain (FDTD) method. With launching the optical waves in 1.55 μm wavelength to the SOI rib waveguide, optical vortices are generated and the spinning details are observed at various time steps. The analysis results are helpful to understand the progress of optical vortices which may be utilized for the development of future nonlinear optical switches.