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Maxwell2D: Young's two-slit experiment

Dielectric constant distribution

This animation illustrates Young's double-slit experiment demonstrating the wave nature of light. An oscillating dipole illuminates two slits in a metal barrier, which themselves act as coherent oscillators that produce an interference pattern at the top of the domain.
Wikipedia link: Double-slit experiment

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.