Abstract
Abstract
In this study, an all-dielectric metasurface with an F-shaped chiral structure in the terahertz region has been proposed. The coupling between the electric and magnetic dipole modes supported by the metasurface can be adjusted by varying the structural parameters. In the parameter space composed of l
l and s, any closed path around exceptional point in the circular polarization conversion channel t
rl
generates a topologically protected exceptional topological phase. A vortex beam generator with a unit topological charge was proposed to provide a novel concept for designing terahertz metasurface wavefront modulation devices.
Funder
National Natural Science Foundation of China
Development Plan of Youth Innovation Team in Colleges and Universities of Shandong Province
Natural Science Foundation of Shandong Province
Subject
General Physics and Astronomy,General Engineering