Topological LC-circuits based on microstrips and observation of electromagnetic modes with orbital angular momentum.

ABSTRACT: New structures with richer electromagnetic properties are in high demand for developing novel microwave and optic devices aimed at realizing fast light-based information transfer and information processing. Here we show theoretically that a topological photonic state exists in a hexagonal LC circuit with short-range textures in the inductance, which is induced by a band inversion between p- and d-like electromagnetic modes carrying orbital angular momentum, and realize this state experimentally in planar microstrip arrays. Measuring both amplitude and phase of the out-of-plane electric field accurately using microwave near-field techniques, we demonstrate directly that topological interfacial electromagnetic waves launched by a linearly polarized dipole source propagate in opposite directi

SUBMITTER: Li Y 

PROVIDER: S-EPMC6214976 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature