Photonic topological insulator

In condensed matter physics and optics, a photonic topological insulator is an artificial materials that support topologically non-trivial, unidirectional states of light. Photonic topological phases are classical electromagnetic wave analogues of electronic topological phases studied in condensed matter physics. Similar to electronic topological insulators, the photonic counterpart can provide robust unidirectional channels for light propagation. The field that studies these phases of light is sometimes referred to as topological photonics.

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