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Maxwell2D: Fibre Bragg grating (no reflection)

Dielectric constant distribution

This example shows a fibre Bragg grating that fully transmits a wave that has a wavelength slightly different from the "Bragg wavelength". The original animation shows reflection when the wavelength is equal to the Bragg wavelength.
Wikipedia link: Fiber Bragg grating
Thanks to Joss Bland-Hawthorn (University of Sydney) for suggesting this animation.

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.