FDTD Simulation of 2D Photonic Crystal Bent Waveguides

This package provides a comprehensive FDTD (Finite-Difference Time-Domain) simulation program for 2D photonic crystal bent waveguides, implemented in MATLAB. The core algorithm handles TE (Transverse Electric) wave propagation through custom photonic crystal structures with specialized boundary treatment. Key implementation features include: Perfectly Matched Layer (PML) boundaries for effective absorption of outgoing waves to minimize reflections, and a flexible plane wave source implementation that allows various excitation configurations. The code structure utilizes matrix-based field updates (Ez, Hx, Hy components) with staggered grid arrangement (Yee grid) for numerical stability. Parameters for photonic crystal lattice constants, rod dimensions, and bending geometry are fully customizable through configuration variables. This simulation tool enables researchers to analyze transmission characteristics, bending losses, and bandgap effects under different structural parameters, making it particularly valuable for photonic crystal device optimization and fundamental research in photonic integrated circuits.