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Maxwell2D: Bragg scattering

Dielectric constant distribution

Bragg scattering is used to probe the structure of crystaline solids with X-rays. Each atom in a lattice behaves similarly to a Rayleigh scatterer under the influence of the incident wave, and certain wavelengths result in constructive interference in particular directions. This enables the structure of the material to be inferred. See what happens if the frequency is increased.
Wikipedia link: Bragg scattering

Electric field animation

This is an animation of the component of the electric field out of the plane of the page.

Total field (incident plus scattered)       |      Scattered field (total minus incident)

Average Poynting vector

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.

Total field (incident plus scattered)       |      Scattered field (total minus incident)