Mantle cloak alu. .

Mantle cloak alu. 1(a)]: a dielectric planar slab with finite thickness d1, cloaked by a metasurface screen placed at distance d2. Alù in 2009 in [50], where it was theoretically demonstrated that the scattering from a dielectric or metallic sphere can be It is visible that the mantle cloak indeed produces a strong scat-tering reduction, thanks to the proper choice of its reactive surface impedance, restoring almost uniform amplitude and planar phase fronts all around the cloak in both planes of polarization, consistent with the 97% scattering reduction predicted in Fig. In this section in order to provide physical insights into the functionality of mantle cloaking, we start by considering the simplest mantle cloak geometry, limited to a 1D problem [Fig. In this context, we have recently proposed an active metasurface cloak based on balanced distributions of loss and gain, forming a so-called parity-time symmetric configuration. The tunable cloak is implemented by loading varactor diodes between two neighboring horizontal metallic strips which constitute the metasurface. 2. We demonstrate that the varactor diodes enable the capacitive reactance of the metasurface to be tunable from −157 Ω to −3 Ω when the DC bias voltage is properly Mar 28, 2013 · The first “mantle” invisibility cloak – in which a very thin “metascreen” cancels light scattering off an object, making it invisible – has been built by a team of researchers in the US. TL;DR: In this article, the concept of mantle cloaking is explored, showing that a single, ultrathin, conformal metasurface may drastically suppress the scattering from planar [1D], cylindrical [2D], and/or spherical [3D] objects. The currents induced on a passive surface are tailored to drastically suppress the visibility of a given object. Dec 1, 2009 · The concept of mantle cloaking was first introduced by Prof. Dec 21, 2009 · I introduce here the idea of surface cloaking, showing that a patterned metasurface may produce similar cloaking effects in a simpler and thinner geometry. In addition we In this context, we have recently proposed an active metasurface cloak based on balanced distributions of loss and gain, forming a so-called parity-time symmetric configuration. I introduce here the idea of surface cloaking, showing that a patterned metasurface may produce similar cloaking effects in a simpler and thinner geometry. We need you to provide your credentials before accessing this content. The cloak is just microns thick and can hide 3D objects from microwaves in their natural environment . We propose a tunable strategy for the ultrathin mantle cloak via metasurface. We show that a small object can be made completely invisible Jun 12, 2011 · We discuss here the use of a graphene monolayer to realize the concept of “cloaking by a surface”, proposing the thinnest possible mantle cloak with operation in the far-infrared and terahertz (THz) regime. Apr 30, 2015 · We theoretically and numerically analyze thermal invisibility based on the concept of scattering cancellation and mantle cloaking. Sep 19, 2018 · Rely on the scattering cancellation principle of mantle cloak characterized by an average surface reactance, a personal computer can achieve this design procedure. Nov 10, 2011 · We explore in detail the concept of mantle cloaking, showing that a single, ultrathin, conformal metasurface may drastically suppress the scattering from planar [one-dimensional (1D)], cylindrical [two-dimensional (2D)], and/or spherical [three-dimensional (3D)] objects. The passive and active portions of the cloak work in concert to cancel the reflections and shadows of an object. We propose realistic designs that may realize this concept at radio (RF) or far-infrared (FIR) frequencies. xr5 bxt plp gkb fu2t9n 2dcug lb tmha4 l7s tvstess