All dielectric terahertz carpet cloaking by phase compensation metasurfaces

摘要

Metasurfaces can control the phase, amplitude and polarization of electromagnetic waves, providing a new method for the design of cloaking devices. At present, most of the metasurface carpet cloaking devices are based on metal structure with larger ohmic loss, which severely limits the efficiency of the devices. Here, we propose to use all dielectric unit structure to construct metasurface layer. By using local phase compensation principle, all dielectric metasurface carpet cloaking can be designed in terahertz region. Based on the numerically simulation of near field and far field characteristics, the cloaking effect can be confirmed. The incident wavefront is reflected by the cloaking device and the plane wave characteristics can be recovered well. The cloaking effect can be effective in a broadband range from 0.3 to 0.58 THz. Moreover, the proposed all dielectric metasurface cloaking technology can be extended to the visible light and microwave range.