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Maxwell2D: Single mode optic fibre

Dielectric constant distribution

An optic fibre has a core with a slightly higher refractive index than the cladding layer surrounding it, and can act as a waveguide for light. This animation shows a single-mode optic fibre, in which the diameter of the core is of the same order as the wavelength of the light, such that only one mode of wave can be supported.
Wikipedia link: Optic fiber

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.