Abstract
A photonic crystal is a dielectric structure in which the refractive index varies periodically in space. Due to its special physical properties, it has theoretical research value and wide application prospects. This paper introduces photonic crystals from the aspects of principle, preparation and application, and makes a summary and outlook on them. This paper focuses on the basic principles and applications of photonic crystals, so as to help more people to have a general understanding of photonic crystals.
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