Multi-wavelength carpet cloaking based on an ultrathin single layer metamaterial microstructure

Abstract

Ultrathin metasurfaces provide a completely new route to achieve an invisibility cloak through local phase compensation. However, conventional carpet cloaking only works at a single frequency. Here, we propose a dual-wavelength carpet cloaking based on a single layer metasurface. Based on the electromagnetic coupling effect between the outside split square loop and inner metal structure array, the independent phase compensation and reconstruction of the reflected wavefront can be realized. The cloaking can effectively suppress the unexpected scattering and hide an object with arbitrary shape. This ultrathin metasurface cloaking can be applied in illusion optics, radars and antenna systems.

Metamaterials and Metasurfaces: A Review from the Perspectives of Materials, Mechanisms and Advanced Metadevices

“…Their exceptional ability to manipulate waves is due to their strong interaction with electrical and/or magnetic fields, typically provided by unit cell geometry-controlled resonant effects. These capabilities result in a broad range of applications such as antenna efficiency enhancement [ 45 , 46 ], ideal absorbers [ 47 , 48 , 49 ], superlenses [ 25 , 50 ], cloaking [ 51 , 52 , 53 ], elimination of scattering [ 28 , 54 ] and energy harvesting [ 16 , 55 , 56 ], among other applications in microwave and optical frequencies. When active and nonlinear components such as transistors [ 57 , 58 ], diodes [ 58 , 59 ], and varactors [ 60 , 61 , 62 ] are added to metasurfaces, novel tunability and switching abilities become possible.…”