Experimentally approaching to reciprocal cloaks via annulus-dielectric-metamaterials

Abstract

Transformation optics has brought a wave of fanaticism among researchers to realize the first-ever invisible cloak over the past decade. Several relevant devices, including internal cloaks, external cloaks, and mantle cloaks, have already been proposed, with a few being experimentally demonstrated. Still, the proposed cloaks possess their insufficiencies to realize a reciprocal cloak. To better illustrate the cloak, here we report a new approach to a transformation-optics-based reciprocal cloak with designed dielectric-annulus-based metamaterials. Our results indicate we can easily control the anisotropic constitutive parameters at will. In addition, the as-fabricated cloak enables concurrent vision and movements of a hidden object, evidenced by both simulated and measured field distributions. More importantly, the cloak demands no bespoke design and is applicable to arbitrary electric-large objects. We affirm that we provide a method to developing the first-ever reciprocal cloak in experiments, and believe that the cloak could be further operated at visible ranges through the methodology we introduced, paving a route toward future applications in the fields of optics, physics, materials science, etc.

In situtunable circular dichroism of flexible chiral metasurfaces composed of plasmonic nanorod trimers

“…The local phase can be designed by manipulating the shape, 19 size, 20 or geometrical orientation of each element. Many metasurface devices have been developed for various purposes, including analogies to refraction and diffraction in Snell's law, [21][22][23][24] optical lenses, [25][26][27][28][29] optical polarization control, [30][31][32][33][34][35][36][37][38][39] optical vortices [40][41][42][43] and optical sensors. [44][45][46][47][48][49] In this study, we realized a tunable, reversible chiroptical metasurface integrated with a exible polydimethylsiloxane (PDMS) substrate.…”

Design method of reusable reciprocal invisibility and phantom device

“…Several reciprocal cloaks have been proposed in the past few years, including two-dimensional (2D) and three-dimensional (3D) devices. [39][40][41] However, all of these devices have a closed geometry each, and the target object inside the device is difficult to replace. Furthermore, objects to be cloaked inside still need to place anti-objects inside the device, that is, the stealth ability of the device is closely related to the location and size of the object to be cloaked.…”

Achieving broad absorption band and high incident angles by stochastically-distributed oblique-flat-sheet metamaterial perfect absorbers

“…Within these two decades, the emergence of metamaterials 1 – 4 and metasurfaces 5 – 7 has changed the design guideline of an optical device. Furthermore, ever since in 2008 Landy et al .…”