Different types of efficiencies are introduced for metasurface (MTS) antennas based on single point-source excitation: 1) the feed efficiency εfeed is the power delivered by the feed to surface wave (SW) over the input power; 2) the tapering efficiency εtap quantifies the deviation with ...
This paper presents two methods for the efficient evaluation of the power balance in circular metasurface (MTS) antennas implementing arbitrary modulated surface impedances on a grounded dielectric slab. Both methods assume the surface current in the homogenized MTS to be known. The first technique re...
Using a metasurface comprising an array of nanorods with different orientations and a backreflector, a hologram image can be obtained in the visible and near-infrared with limited loss of light intensity. Surfaces covered by ultrathin plasmonic structure
In this paper, an efficiency tunable reflective metasurface (MS) consisting of a dielectric substrate sandwiched between hollow Z-shaped (HZS) structure graphene and a metallic ground plane is proposed for single/dual-focusing effects based on Pancharatnam-Berry (PB) in terahertz (THz) region. Nume...
However, it is still challenging for wavefront control because of its unfeasibility in forming a phase gradient at different folding angle β. Here, we report a strategy of kirigami-inspired reconfigurable phase gradient metasurfaces to efficiently control beam steering of scattering wave through ...
“metasurface”. In the presence of external EM waves, the metasurface carries a “phase transition” that is loaded onto the re-radiated EM waves, thus allowing for artificially designed electromagnetic radiation intensity and phase distribution and modulation of the EM wave front. Metasurfaces ...
metasurfaces 1–4 —haverecentlybeenshowntobecapableof completelycontrollingthephaseoflight,representinganew paradigmforthedesignofinnovativeopticalelementssuchas ultrathinflatlenses 5–7 ,directionalcouplersforsurfaceplasmon polaritons 4,8–10 andwaveplatevortexbeamgeneration ...
“This paper addresses some of these questions: it says that we can indeed build large-area metasurfaces that are still very thin, they are dielectric – so low loss – and yet they can provide a large numerical aperture, and goes forward to compare the response with state-of-the-art ...
In addition, the design of the metasurface proposed in this study introduces an air gap between the antennas and the surrounding media that confines the field within the gap, which mitigates the crosstalk between meta-atoms and minimizes metallic absorption. The proposed metasurface is broadband, ...
Metasurfaces are made of subwavelength nanoantennas with a flat, ultrathin architecture, and strong capability in manipulating the propagation of light by flexible modulations on its phase, amplitude, and polarization. Conventional metallic metalenses always suffer from its low efficiencies due to large ...