With the freely available interactive FDTD toolbox you can **simulate and visualize** the electromagnetic field in a structured material such as a **photonic crystals**, **waveguides** or investigate **refraction** at dielectric boundaries and diffraction in **free space**.

The interactive FDTD toolbox is a simulation software to model and simulate two dimensional optical systems in TE-Polarization. It is written by Sören Schmidt and written to work with MATLAB(©). It was designed for the purpose of education and learning since no further knowledge of MATLAB or computational physics is required. The software is embedded in a **graphical user interface** in which all the simulation parameters are defined. Geometrical structures are set via **draggable forms** which makes the program very intuitive and easy to use. Nonetheless the program works very efficient, accurate and reliable. Underneath, the interactive FDTD toolbox is implemented after a matrix-based algorithm according to Yee's FDTD-Method allowing easy **parallelization**. Perfectly matched layer (PML) boundary conditions as well as different current like sources are included. With the software you can easily **create movies** and save your field data. We have also prepared some tutorials that will help you to use the program, see below.

download the interactive FDTD toolbox (iFDTD) here

An **example** of a gaussian beam entering a prism undergoing **total internal reflection** made with the toolbox.

## Tutorials