Anomalous Wave Propagation in Magnetic Hyperbolic Metasurfaces

Topological transitions in reciprocal space, widely existing in hyperbolic metasurfaces, have attracted significant attention due to their unprecedented capabilities to redirect surface plasmon polaritons, for example, anomalous wave propagation, negative refraction, non-diffraction transmission, etc. However, previous studies have mostly focused on electric hyperbolic metasurfaces, while magnetic configurations that enable magnetic light-matter interaction and the manipulation of magnetic surface waves have seldom been studied. Here, we theoretically and numerically study a terahertz magnetic topological transition metasurface consisting of the double-split ring resonator arrays, demonstrating that breaking the symmetry of the metal pattern is an efficient method to introduce Fano resonance and novel independent self-collimation frequency. Furthermore, we try to combine two different magnetic hyperbolic metasurfaces to manipulate the magnetic surface waves at the topological transition interface at will. The proposed integrated metasurface provides new degree of freedom for the control of magnetic plasmons and presents a great potential in the applications of plasmonic devices.