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Maxwell2D: Michelson interferometer, two frequencies

Dielectric constant distribution

The same Fourier transform spectrometer as in the previous example is used, but this time two frequencies are used. It can be seen that only one frequency emerges for this combination of mirror positions.
Wikipedia link: Fourier transform spectroscopy

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.