engleski

Weyl points in photonic-crystal superlattices

We show that Weyl points can be realized in all-dielectric superlattices based on three- dimensional (3D) layered photonic crystals. Our approach is based on creating an inversion- breaking array of weakly-coupled planar defects embedded in a periodic layered structure with a large omnidirectional photonic band gap. Using detailed band structure calculations and tight- binding theory arguments, we demonstrate that this class of layered systems can be tailored to display 3D linear point degeneracies between two photonic bands, without breaking time- reversal symmetry and using a configuration that is readily-accessible experimentally. These results open new prospects for the observation of Weyl points in the near-infrared and optical regimes and for the application of Weyl-physics in integrated photonic devices.

Weyl points ; three-dimensional photonic crystals ; topological photonic

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