Active Exterior Cloaking for the 2D Laplace and Helmholtz Equations

Vasquez, Fernando Guevara; Milton, Graeme W.; Onofrei, Daniel

doi:10.1103/physrevlett.103.073901

Cited by 142 publications

(168 citation statements)

References 31 publications

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“…Anomalous localized resonance has also been utilized to conceal small objects, and the cloaking can be achieved in the region external to the cloak [40]. Very recently, a broadband exterior cloaking mechanism, which is based on destructive interference using active cloaking devices, is also proposed by Milton and coworkers [41,42]. In contrast to these methods, Tretyakov et al theoretically and experimentally realized broadband cloaking devices by using transmission-line networks [43,44].…”

Section: Introductionmentioning

confidence: 99%

TRANSPARENT SHELLs --- INVISIBLE TO ELECTROMAGNETIC WAVES

Mei¹,

Cui²

2009

PIER B

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Abstract-In this paper, we study metamaterial-based transparent shells, which are invisible to electromagnetic waves and fields. More general topics, including material loss, material discretization and far field distribution etc. are covered in order to facilitate possible realization. We design and analyze the transparent shells using optical transformation. Unlike the widely-studied cloaking devices which make the objects inside invisible, the transparent shells physically cover and shield the devices inside without sacrifice of their electrical performance since they are transparent to incoming electromagnetic waves. Due to the simple constitutive parameters, these transparent structures could be realized using artificial metamaterials in a wide frequency band, which may have wide applications in civil and military areas.

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Section: Introductionmentioning

confidence: 99%

TRANSPARENT SHELLs --- INVISIBLE TO ELECTROMAGNETIC WAVES

Mei¹,

Cui²

2009

PIER B

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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%

“…An SCC can mainly be classified into two types. 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]).…”

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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“…On the other hand, the concept of complementary media was adopted to design external cloaks that can cloak objects at a distance outside the cloaking shell [12,13]. More recently, another cloaking method to design an active exterior cloak was proposed [14], which needs to know in advance the incoming probing wave, including phase information. However, the "antiobject" [12] inside the shell gives rise to certain restrictions.…”

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confidence: 99%

Distributed external cloak without embedded antiobjects

Han

Qiu

2010

Opt. Lett.

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We propose a distributed external cloak without embedded antiobjects, which contains tunable windows and a cloaking area. It consists of closed and standalone systems whose positions and parameters can be separately controlled by the design purpose and folded geometry. Such an external cloak does not rely on either cloaked material or the concept of the antiobject [Phys. Rev. Lett. 102, 093901 (2009)] in the complementary material, and can thus be kept unchanged when different objects are considered. The object lies outside the cloak and is not blinded in terms of multiple open windows desired by specific designs. Such a distributed cloak enables us to conceal arbitrary objects of varying shape in center areas, which may exceed the inner boundary of a perfect closed cloak.

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Active Exterior Cloaking for the 2D Laplace and Helmholtz Equations

Cited by 142 publications

References 31 publications

TRANSPARENT SHELLs --- INVISIBLE TO ELECTROMAGNETIC WAVES

TRANSPARENT SHELLs --- INVISIBLE TO ELECTROMAGNETIC WAVES

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

Distributed external cloak without embedded antiobjects

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