How does a photonics crystal control the radiation direction of light?

02 April 2014 1 7K Report

Can you explain this in the most simple form so I can understand the physics behind this.

its is just like a donor or acceptor states in an electronic crystal ,In phtotonic crystal refractive index difference between the materials(core and cladding) guides the way for propagation of light . breaking the periodicity of the crystal results in localization of the light within the defected volume (cavity)

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