# Two Material Wave Guide Interface

## Model Data

**Type:**
electromagnetics

**Physics Modes:**
custom equation

**Keywords:**
wave guide
helmholtz equation
equation editing
multi domain

Simulation of a wave guide interface with two different materials. The changing diffraction pattern of planar time harmonic waves is investigated using the Helmholtz equation

$$ -( \frac{\partial^2 A}{\partial x^2} + \frac{\partial^2 A}{\partial y^2} ) - k^2 A = 0 $$

This model is available as an automated tutorial by selecting **Model
Examples and Tutorials…** > **Electromagnetics** > **Two Material
Wave Guide Interface** from the **File** menu. Or alternatively,
follow the linked step-by-step instructions.