Pulse propagation in photonic crystal Multimode Interference waveguides using time doma in beam-propagation method

This paper presents an efficient technique for simulation of time-domain pulse propagation of Multimode Interference waveguides in two-dimensional electromagnetic band gap (EBG) structures. Photonic Band Gap (or Electromagnetic Band Gap) and frequency-selective structures will be widely applied to the various (sub) millimeter and Terahertz components such as compact and low-loss filters, directional coupler and power divider. 2D photonic crystal multimode interference devices having a square/triangular lattice pattern of periodic air holes in a planar dielectric slab are numerically considered. ADIM-based TD-BPM with Pade(1, 1) approximation will be discussed through numerical examples in (1 times N) MMI circuits with photonic crystal structures. A good equivalent model is applied to analysis the designed structures on the basis of multimode interference effect and self-imaging principle.