Wave and Ray Analysis of a Type of Cloak Exhibiting Magnified and Shifted Scattering Effect

Abstract

Abstract-Ray-tracing exercise and full-wave analysis were performed to validate the performance of a type of cloak composed of isotropic metamaterials. It is shown that objects inside the 'folded region' of this cloak appear invisible to the incoming light from a ray tracing exercise, but exhibit magnified and shifted scattering under a plane wave illumination from a full wave analysis. Gaussian beams are introduced to resolve this interesting paradox resulted from these two methods. We show that at the time-harmonic state, small energy can be diffracted into the folded region and contribute to the resonant state even when the Gaussian beam is steered away from the cloak with an object inside. A scattering pattern identical to that scattered from the image of the object will be formed, which agrees well with the phenomenon in the plane wave incidence case.

Perfect Metamaterial Absorber With Dual Bands

“…The results show that the one-dimensional absorber has two distinct absorption points near 0.45 and 0.92 THz. MMA hold great promise for future applications such as bolometer, invisibility cloaks, sub-wavelength imaging and so on [28][29][30][31].…”

Design and Simulation of L-Shaped Chiral Negative Refractive Index Structure

“…In this paper, we design and simulate a new L-shaped chiral structure which owns stronger rotation angle and larger negative refractive index. This chiral structure may have many potential applications such as cloaking [35][36][37], subwavelength imaging [38][39][40], focusing [41], optical storage [42], and polarization devices [43,44], including pure linear polarization rotator and half-wave plate.…”

Design of Ultracompact Graphene-Based Superscatterers

“…This concept was first proposed based on the transformation optics approach, where the scattering cross section of a cylindrical perfect electric conductor (PEC) is enhanced by an anisotropic and inhomogeneous electromagnetic cover [1], [2], [3], [4], [5], [6], [7], [8]. Alternatively, for subwavelength objects, a superscatterer can be designed by the metal-dielectric layers, where the scattering cross section is magnified due to the enhancement of the localized surface plasmons [9], [10].…”

“…S UPERSCATTERER is a device that can magnify the scattering cross section of a given object remarkably [1], [2]. This concept was first proposed based on the transformation optics approach, where the scattering cross section of a cylindrical perfect electric conductor (PEC) is enhanced by an anisotropic and inhomogeneous electromagnetic cover [1], [2], [3], [4], [5], [6], [7], [8].…”