Study On Manipulation Of The Propagation Of Terahertz Surface Plasmon Polaritons With Hyperbolic Metasurfaces

Electromagnetic waves can propagate along the interface between two media with opposite permittivity/permeability,known,respectively,as electric and magnetic surface waves.Due to their quasi-two-dimensional characteristics and strong field enhancement,surface waves show brilliant prospects for sensing,communication,and integrated optical devices.Seeking flexible and effective methods for the control of surface wave propagation has been an intriguing research topic,especially in the terahertz regime.In recent years,with the development of sub-wavelength optics and micro-nano fabrication techniques,metasurfaces have become an ideal tool for the control of surface waves.Manipulation of terahertz surface waves based on hyperbolic metasurfaces was carried out in this thesis and the contents include:1)By properly designing the geometric parameters of the complementary H-shaped resonators,the dispersion of the supported electric surface waves can be freely adjusted,including isotropic,anisotropic,and hyperbolic dispersion.Furthermore,anomalous wave propagation and directional surface wave propagation at the interface between metasurfaces with different dispersion properties were investigated,and as a result,by properly designing the metasurfaces,surface waves can be steered toward desired directions.2)In addition,negative magnetic permeability was realized using an array of double-slit split-ring resonators,so that magnetic surface waves can exist and propagate at the interface between the magnetic hyperbolic metasurfaces and air.Similarly,by adjusting the geometric parameters of the double-slit split-ring resonator,the dispersion of the magnetic surface waves can be manipulated,and the anomalous wave propagation at different dispersion metasurface interfaces was also investigated.3)Based on the universality of the metasurfaces design principle,proof-of-concept metasurfaces at microwave frequencies were fabricated by printed circuit board technology.Based on vector network analyzer,surface wave propagation was characterized by a two-dimensional near-field scanning system,in which the experimental results verified the proposed design scheme well.The proposed topological transition electric and magnetic hyperbolic metasurfaces may open up unprecedented avenues for anomalous electric and magnetic wave propagation and guidance,showing exceptional capabilities for designing integrated photonic devices.