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Maxwell2D: Diffraction grating, two frequencies

Dielectric constant distribution

This example uses exactly the same grating as the first and second diffraction-grating examples, but with two frequencies simultaneously. The two frequencies are separated effectively by the grating.

Electric field animation	Time-averaged Poynting vector
This is an animation of the component of the electric field out of the plane of the page.	The direction in which energy is travelling at any instant is proportional to the cross product of the electric and magnetic fields, known as the Poynting vector. The arrows show the direction of the Poynting vector averaged over the simulation, while the colours show its strength.