Distributed external cloak without embedded antiobjects

Han, Tiancheng; Qiu, Cheng‐Wei

doi:10.1364/ol.35.002642

Cited by 30 publications

(14 citation statements)

References 17 publications

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“…However, it should be noted that the invisibility of an external cloak is greatly depended on a pre-defined position, shape and size of a hidden object while the proposed device is independent of them, which provides a feasible approach to hide a moving object. Although the concept of open cloak has been proposed by Han et al [36][37][38] in 2010, the inhomogeneity and anisotropy of material parameters was a big challenge for fabrication. In contrast, the homogeneous open cloak proposed here will relax the implementation difficulty of the device.…”

Section: Numerical Simulations and Discussionmentioning

confidence: 99%

Design of open devices based on multi-folded transformation optics

et al. 2020

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Open devices with homogeneous material parameters are proposed and designed based on multi-folded transformation optics, including open cloak device, open field concentrator and open field amplifying device. In comparison with the previous transformation devices, the proposed open devices possess open windows with compact and embedded structures, providing a flexible approach for remote control or upgrade.The open cloaking devices can hide arbitrarily shaped/sized object in the core region, making it disappeared in visually for the outside viewers, while the open field concentrator can enhance or store EM energy in the core region, and the open field amplifying device can magnify the scattering field of a small object, generating an bigger illusory image with differential material parameter and size. The effectiveness and correctness of the proposed devices are validated by the numerical results obtained based on the commercial finite element software COMSOL Multiphysics. Such scheme is believed to find potential applications in remote controlling with impressive new functions.

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Section: Numerical Simulations and Discussionmentioning

confidence: 99%

Design of open devices based on multi-folded transformation optics

et al. 2020

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“…When one looks at object A, but sees object B, it is called an illusion [27][28][29][30][31][32]. It can be achieved using the advanced boundary conditions…”

Section: Illusionmentioning

confidence: 99%

“…The transformed fields are constructed in such manner that allows to exclude the incident fields from the boundary conditions. This prominent property provides a number of exciting applications like invisibility cloaking [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], optical concentrators [19,25], rotators [19,26], illusion optics devices [27][28][29][30][31][32], and cylindrical to plane wave converters [33]. Transformation of the fields and material parameters can be applied in computational photonics, too [2,[34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Field Approach in the Transformation Optics Concept

Novitsky

Zhukovsky²,

Barkovsky

et al. 2012

PIER

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Abstract-An alternative, field-based formulation of transformation optics is proposed. Field transformations are expressed in the language of boundary conditions for the electromagnetic fields facilitated through the introduction of generalized potential functions. It is shown that the field-based approach is equivalent to the conventional coordinate-transformation approach but is preferable when looking for specific field distribution. A set of example devices such as invisibility cloaks, concentrators, rotators, and transformation optics lenses capable of creating light beams with predetermined field distribution (e.g., Gaussian and sinusoidal) is studied to validate the effectiveness of the field-based formulation. As for the boundary conditions for the cloaked region the absence of the normal component of the Poynting vector is justified. In the frames of the fieldbased approach the physical reasons behind infinite components (singularities) of the material parameters of transformation optics devices are straightforwardly revealed.

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“…In 2009, Lai et al proposed the concept of 'cloaking at a distance' [6] called external cloaking, where an object is hidden exterior to the cloak and is not blinded in contrast to internal cloaking. The idea of external cloaking is based on the concept of complementary medium and transformation optics [6][7][8][9][10][11][12][13]. A diamond shaped external cloak with homogeneous material parameters has been proposed in [11].…”

Section: Introductionmentioning

confidence: 99%

Composite-Shaped External Cloaks With Homogeneous Material Properties

Vura

Rajput

Srivastava

2016

Antennas Wirel. Propag. Lett.

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Two composite shaped external cloaks are proposed based on the concept of linear transformation method and complementary media. Each composite shaped cloak is sub-divided into regions of rectangular and triangular shapes. The advantage of the proposed cloak designs is that the material properties are finite, homogeneous and non-singular within all sub-regions of the cloaks which is good for practical realization. The cloak size of each of the proposed designs is smaller compared to the conventional external cloaks. Moreover the cloaking area of proposed cloaks can be increased in the vertical direction without any change in material parameters of core and complementary regions which is an additional benefit for hiding long objects. Full-wave simulations reveal that the proposed cloaks have good performance even for hiding multiple objects of different shapes and sizes inside it for all angles of incidence of electromagnetic wave.

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Distributed external cloak without embedded antiobjects

Cited by 30 publications

References 17 publications

Design of open devices based on multi-folded transformation optics

Design of open devices based on multi-folded transformation optics

Field Approach in the Transformation Optics Concept

Composite-Shaped External Cloaks With Homogeneous Material Properties

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