Multi-frequency metasurface carpet cloaks

Abstract

Metasurfaces provide an alternative way to design three-dimensional arbitrary-shaped carpet cloaks with ultrathin thicknesses. Nevertheless, the previous metasurface carpet cloaks work only at a single frequency. To overcome this challenge, we here propose a macroscopic metasurface carpet cloak. The cloak is designed with a metasurface of a few layers that exhibit a special spatial distribution of the conductance and inductance in the unit cell; therefore, it can fully control the reflection phases at several independent frequencies simultaneously. Because of this, the present metasurface cloak can work at dual frequencies based on multi-resonance principle. The proposed design methodology will be very useful in future broadband macroscopic cloaks design with low profiles, light weights, and easy access.

Wide‐band polarisation‐independent metasurface‐based carpet cloak

“…Although some methods are proposed to design broadband metasurface‐based carpet cloaks [38, 39], their performance is limited to a specific polarisation, and near‐infrared [38] or visible [39] regime. Recently, using multi‐layer metasurfaces, dual‐band carpet cloaks, being able to operate at two distinct frequencies, are also proposed [40, 41]. However, the operating frequencies in these works are limited to only two distinct frequencies, 6.1 and 10.2 GHz in [40], and 7.8 and 12.3 GHz in [41], and does not include a continuous frequency range.…”

Polarization‐independent multiband metamaterials absorber by fundamental cavity mode of multilayer microstructure

“…Metamaterials are artificial composite structural materials that have some usual physical characteristics, which are different from natural materials . The peculiar performances of metamaterials depend not only on the media itself, but also on the design of subwavelength microstructure or nanostructure .…”

“…Metamaterials are artificial composite structural materials that have some usual physical characteristics, which are different from natural materials. [1][2][3][4][5][6][7][8][9][10] The peculiar performances of metamaterials depend not only on the media itself, but also on the design of subwavelength microstructure or nanostructure. [11][12][13][14][15][16][17][18][19][20] Thus, metamaterials have attracted wide attention in recent 10 years in the field of miniaturization antenna, super resolution imaging, high sensitive detector, electromagnetic wave absorber, electromagnetic invisibility, and so on.…”

Ultrathin Acoustic Metasurface Holograms with Arbitrary Phase Control

“…Unlike conventional optical devices, the metasurface is thin, compact, and capable of controlling phases. Owing to these advantages, the metasurface is opening the path to various applications, such as ultrathin flat lenses [20][21][22], carpet cloaks [23][24][25], and polarization conversion [26]. It has also made compact, efficient, and versatile optical holograms come true [27][28][29].…”