Experimental Demonstration of a Free-Space Cylindrical Cloak without Superluminal Propagation

Xu, Su; Cheng, Xiangxiang; Xi, Sheng; Zhang, Runren; Moser, H. O.; Shen, Zhi; Xu, Yang; Huang, Zhengliang; Zhang, Xianmin; Yu, F. Richard; Zhang, Baile; Chen, Hongsheng

doi:10.1103/physrevlett.109.223903

Cited by 90 publications

(72 citation statements)

References 28 publications

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“…Generally, the TO devices are realized by using metamaterials [14][15][16][17][18][19][20], which require complicated designs of electric and magnetic resonances, hindering the realization and applications in practice. In fact, most of the previous TO experiments were realized by using the so-called reduced parameters, which maintain the refractive behavior, but sacrifice the impedance matching as well as the perfect transparency [25,[39][40][41][42][43][44][45]. Moreover, at optical frequencies, the inherent loss in metallic components of metamaterials makes the realization of perfect transparency as well as the ideal nonreflecting TO devices extremely difficult [46,47], if not impossible.…”

Section: For Transformation Opticsmentioning

confidence: 99%

Structure-Induced Ultratransparency in Photonic Crystals

Luo¹,

Lai²

2018

Theoretical Foundations and Application of Photonic Crystals

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This chapter presents the recent progress on structure-induced ultratransparency in both one-and two-dimensional photonic crystals (PhCs). Ultratransparent PhCs not only have the omnidirectional impedance matching with the background medium, but also have the ability of forming aberration-free virtual images. In certain frequency regimes, such ultratransparent PhCs are the most transparent solid materials on earth. The ultratransparency effect has many applications such as perfectly transparent lens, transformation optics (TO) devices, microwave transparent devices, solar cell packaging, etc. Here, we demonstrate that the ultratransparent PhCs with "shifted" elliptical equal frequency contour (EFC) not only provide a low-loss and feasible platform for transformation optics devices at optical frequencies, but also enable new degrees of freedoms for phase manipulation beyond the local medium framework. In addition, microwave transparent devices can be realized by using such ultratransparent PhCs.

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Section: For Transformation Opticsmentioning

confidence: 99%

Structure-Induced Ultratransparency in Photonic Crystals

Luo¹,

Lai²

2018

Theoretical Foundations and Application of Photonic Crystals

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“…Despite its elegance, the proposed general cloaking theory1, 2, 3, 4, 5, 6, 7, 8 is tremendously difficult to implement; as a result, all previous implementations have involved special cases 9, 10, 11, 12, 13, 14, 15, 16, 17, 18. The first experimental validation of an invisibility cloak was a 2D microwave cloak9 for single‐frequency transverse electric (TE) waves.…”

Section: Introductionmentioning

confidence: 99%

3D Visible‐Light Invisibility Cloak

et al. 2018

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The concept of an invisibility cloak is a fixture of science fiction, fantasy, and the collective imagination. However, a real device that can hide an object from sight in visible light from absolutely any viewpoint would be extremely challenging to build. The main obstacle to creating such a cloak is the coupling of the electromagnetic components of light, which would necessitate the use of complex materials with specific permittivity and permeability tensors. Previous cloaking solutions have involved circumventing this obstacle by functioning either in static (or quasistatic) fields where these electromagnetic components are uncoupled or in diffusive light scattering media where complex materials are not required. In this paper, concealing a large‐scale spherical object from human sight from three orthogonal directions is reported. This result is achieved by developing a 3D homogeneous polyhedral transformation and a spatially invariant refractive index discretization that considerably reduce the coupling of the electromagnetic components of visible light. This approach allows for a major simplification in the design of 3D invisibility cloaks, which can now be created at a large scale using homogeneous and isotropic materials.

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“…Invisibility, which has been a long-time goal, has received many studies with transformation optics (TO), meta-materials and other methods in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Readers can get some background on this topic with some recent reviews (see e.g., [17,18]).…”

Section: Introductionmentioning

confidence: 99%

“…From the view of optics, the hidden region is isolated from the outside world "optically". The other type is the scattering cancellation cloak (SCC) [7][8][9][10][11][12]. An SCC works by eliminating or greatly reducing the scattering cross section of the hidden object.…”

Section: Introductionmentioning

confidence: 99%

“…One is an active SCC that is composed of some active sources [11] or active Huygens-surfaces [12]. The other type is a passive SCC including a complementary medium method [10], plasmonic shells or mantle cloaks [7], and cloaks based on some optimization algorithms (e.g., genetic algorithm [8] and topology optimization algorithm [9]). For an active SCC (which often can work in a broadband frequency range), the user has to know the incident wave information (including both amplitude and phase information) in advance.…”

Section: Introductionmentioning

confidence: 99%

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A THIRD WAY TO CLOAK AN OBJECT: COVER-UP WITH A BACKGROUND OBJECT (Invited Paper)

Sun¹,

He²

2014

PIER

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Abstract-Based on a space folding transformation, we propose a new way to hide an object in full space, namely, to cover-up the scattering of the hidden object with the scattering of a background object so that only the scattering of the background object can be detected by an outside observer and the hidden object disappears electromagnetically (a very weak "ghost image" or perturbation may appear inside the strong background object image in an experiment). The present method is essentially different from previous methods of cloaking an object, namely, the optically isolated cloak and the scattering cancellation cloak, and thus provide a third way to cloak an object. Unlike all the previous methods of cloaking, the present full-space omni-directional invisibility simultaneously has the following features: (i) the hidden object can "see" the outside world without being detected; (ii) the cloak can still work when some characteristics (e.g., shape and medium) of the hidden object change; and (iii) there is no need to know the information of the incident wave in advance. The present work furthers efforts to achieve invisibility and conceal an object in a real environment in full space.

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Experimental Demonstration of a Free-Space Cylindrical Cloak without Superluminal Propagation

Cited by 90 publications

References 28 publications

Structure-Induced Ultratransparency in Photonic Crystals

Structure-Induced Ultratransparency in Photonic Crystals

3D Visible‐Light Invisibility Cloak

A THIRD WAY TO CLOAK AN OBJECT: COVER-UP WITH A BACKGROUND OBJECT (Invited Paper)

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