Observation of a Charge-2 Photonic Weyl Point in the Infrared
Sachin Vaidya, Jiho Noh, Alexander Cerjan, Christina Jörg, Georg von Freymann, Mikael C. Rechtsman
Abstract
Weyl points are robust point degeneracies in the band structure of a periodic material, which act as monopoles of Berry curvature. They have been at the forefront of research in three-dimensional topological materials as they are associated with novel behavior both in the bulk and on the surface. Here, we present the experimental observation of a charge-2 photonic Weyl point in a low-index-contrast photonic crystal fabricated by two-photon polymerization. The reflection spectrum obtained via Fourier-transform infrared spectroscopy closely matches simulations and shows two bands with quadratic dispersion around a point degeneracy.
Topics & Concepts
Photonic crystalBerry connection and curvaturePhotonicsPhysicsInfraredDegeneracy (biology)OpticsPhotonic metamaterialFourier transformPhotonCondensed matter physicsMaterials scienceQuantum mechanicsGeometric phaseBiologyBioinformaticsTopological Materials and PhenomenaAlgebraic structures and combinatorial modelsPhotonic Crystals and Applications