Terahertz carpet cloak based on a ring resonator metasurface

Abstract

Abstract. In this work we present the concept and design of an ultrathin (λ/22) terahertz

Advances in Full Control of Electromagnetic Waves with Metasurfaces

“…It was numerically proved that, by compensating the local phases with graded metasurfaces, a unidirectional carpet cloak is achievable to mimic the refl ection from a fl at ground, with which an arbitrary object can been hided in the prescribed region. [150][151][152][153] Freshly, an ultrathin invisibility skin cloak for visi ble light was realized experimentally by spatially distributing the MIM-type resonators ( Figure 6 a). [ 154 ] In comparison of bulky cloaks realized via 3D metamaterials, the achieved metasurface cloak was only with thickness 80 nm (one ninth of the operation wavelength).…”

Full‐Polarization 3D Metasurface Cloak with Preserved Amplitude and Phase

“…[15] Studies of metasurfaces highlight a promising way to design macroscopic carpet cloaks: adjusting the local reflection phase of a ground using a metasurface and thus restoring the phase of reflected beams as if the light had impinged onto a flat mirror. [21][22][23][24][25] Thus, metasurface-based carpet cloaks are inherently phase-preserved, and recent studies further reveal that they are perfectly amplitude-preserved if the operational incident angle is near 0°. [21] Metasurface cloaks inherit the qualities of metasurfaces and offer multiple advantages compared with traditional quasiconformal mapping-based bulky cloaks, including ultrathin thickness, light weight, the convenience of fabrication, ease of scaling up to macroscopic, applicability at any shape and size, and no lateral shift of reflected beams.…”

Experimental Demonstration of Metasurface‐Based Ultrathin Carpet Cloaks for Millimeter Waves

“…This transformation can be achieved with nonmagnetic materials with an inhomogeneous permittivity. [18][19][20][21] The cloaking effect is achieved by manipulating the phase of the reflected wave along the boundary of the concealed volume. [14] Recently metasurfaces, i.e., artificially engineered ultrathin surfaces, have attracted significant interest, as they provide a powerful way of controlling the electromagnetic wave by manipulating the local amplitude and phase of the field.…”

“…[18][19][20][21] The cloaking effect is achieved by manipulating the phase of the reflected wave along the boundary of the concealed volume. In our previous work, [20] we numerically analyzed a terahertz carpet cloak based on a gradient metasurface made of closed ring resonators. A metasurface cloak based on this principle has been experimentally demonstrated in optics, [22] showing interesting perspectives for this cloaking technique.…”