期刊
PHYSICAL REVIEW B
卷 91, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.195444
关键词
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资金
- Spanish Government under Contract Consolider Engineering Metamaterials [CSD2008-00066, TEC2011-28664-C02-01]
- Spanish Ministerio de Economia y Competitividad [FPI BES-2012-054909]
- Spanish Government [RYC-2011-08221]
- NSF CAREER Award [ECCS-0953311]
- AFOSR [FA9550-13-1-0204]
In this work we present the concept and design of an ultrathin (lambda/ 22) terahertz (THz) unidirectional carpet cloak based on the local phase compensation approach enabled by gradient metasurfaces. A triangular surface bump with center height of 4.1 mm (1.1 lambda) and tilt angle of 20 degrees is covered with a metasurface composed of an array of suitably designed closed ring resonators with a transverse gradient of surface impedance. The ring resonators provide a wide range of control for the reflection phase with small absorption losses, enabling efficient phase manipulation along the edge of the bump. Our numerical results demonstrate a good performance of the designed cloak in both near field and far field, and the cloaked object mimics a flat ground plane within a broad range of incidence angles, over 35 degrees angular spectrum centered at 45 degrees. The presented cloak design can be applied in radar and antenna systems as a thin, lightweight, and easy to fabricate solution for radio and THz frequencies.
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