Topology Protects Light Propagation in Photonic Crystal (IMAGE)
Caption
Electron microscopy image of topological photonic crystals in a perforated slab of silicon. The top and bottom crystal structures differ slightly; along the boundary between two parts (dotted line) light can be guided. The disparate mathematical description (topology) of the light fields in the two crystals prescribes that their boundary has to conduct light; that conduction is thus 'topologically protected'.
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AMOLF
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