Multi-beam collimating meta-corners

Abstract

We demonstrate the generation of multiple highly directive beams in an angular range larger than 180-degrees from meta-surfaces formed of -shaped corners. More specifically, the meta-reflecting-corner and the meta-transmitting-corner are devised respectively to create well-collimated beams as a corner-reflector and a corner-lens through properly arranged sub-wavelength ring patches on the meta-surfaces. The corner-reflector requires a single layered meta-surface to accomplish the beam collimation, while the corner-lens applies multi-layered meta-surfaces to obtain the desired phase coverage with satisfactory transmittance. We continue to integrate the meta-mirror and the meta-lens into a single meta-corner, and generate multiple highly directive beams radiating forwards and backwards in the 360-degree universal angular scope rather than a half-space merely in the reflecting spectrum or solely in the transmitting regime. Finally, we fabricate such meta-corners and demonstrate the perfect generation of multiple highly directive beams.

Visible-Infrared Transparent Coding Metasurface Based on Random Metal Grid for Broadband Microwave Scattering

“…The metal-dielectric-metal three-layer structure is a common unit structure for the reflective metasurfaces. ,− ,, In the unit, the bottom layer is generally a whole metal plate to reflect EMWs. The metal on the top is elaborately designed into various patterns.…”

“…Although the present metasurfaces can perform a variety of functions, most of the materials used in metasurfaces are copper, aluminum, and other metals, which are optically opaque. − However, the opacity limits the application of metasurfaces in areas requiring transparency, such as optical windows. The transparent metasurfaces are essential for the display screens of communication devices, the cockpit covers of aircraft, and the detection windows of satellites.…”