A FDTD-Based Executable Program for Calculating Scattering and Transmission in 2D Photonic Crystals

We have developed a compact software application employing the Finite-Difference Time-Domain (FDTD) algorithm specifically designed for analyzing scattering and transmission characteristics in two-dimensional photonic crystals. The core implementation utilizes Yee's grid discretization scheme for electromagnetic field propagation, with perfectly matched layer (PML) boundary conditions handling wave absorption. The program architecture allows straightforward modification of input parameters including lattice geometry, dielectric constant distribution, and excitation sources, enabling customized photonic crystal simulations. Key computational modules incorporate frequency-domain Fourier transforms to extract transmission spectra and near-field to far-field transformations for radiation pattern analysis. This versatile tool provides researchers in photonic crystal studies with an efficient platform for accurate system modeling, result comparison, and design optimization. The object-oriented code structure facilitates extension to complex crystal configurations while maintaining computational efficiency through optimized memory management and parallel processing capabilities.