Journal
OPTICS LETTERS
Volume 48, Issue 4, Pages 932-935Publisher
Optica Publishing Group
DOI: 10.1364/OL.482614
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In this study, two pairs of triply degenerate points (TDPs) are proposed in a 3D metamaterial by breaking the time reversal symmetry. Asymmetric surface states with spin-polarization are revealed based on these TDPs, and a topological chiral beam splitter is demonstrated. The study provides a new platform to study spin-polarization surface states and the enhanced spin photonic Hall effect in metamaterials.
Dirac points (DPs) and Weyl points (WPs) have received much attention in photonic crystals (PhCs) and three-dimensional (3D) metamaterials research due to the robust surface states and Fermi arcs. In this work, two pairs of triply degenerate points (TDPs) have been proposed in a 3D metamaterial by breaking the time reversal symmetry (T) with an external magnetic field. Based on these TDPs, two pairs of asymmetric surface states with spin-polarization are revealed, and a topological chiral beam splitter is demonstrated showing the different propagating directions of the right-handed polarization (RCP) and left-handed polarization (LCP) lights. Remarkably, we can achieve unidirectional propagation with RCP or LCP even excited by a linear source owing to the asymmetry surface state. Our work provides a new, to the best of our knowledge, platform to study spin-polarization surface states and the enhanced spin photonic Hall effect in the metamaterials. (c) 2023 Optica Publishing Group
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