Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Sun, Fei; He, Sailing

doi:10.2528/pier14031707

Cited by 13 publications

(11 citation statements)

References 28 publications

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“…TO is based on the form-invariant of Maxwell's equations under coordinate transformation. A special medium (the so-called transformed medium), which can be used to control the tracing of electromagnetic waves 6 7 or the distribution of DC electric or magnetic fields 10 11 12 13 14 15 in an unprecedented way, can be designed by TO. This idea has been extended to control the tracing of acoustic waves 16 and thermal fields 17 18 .…”

Section: Methodsmentioning

confidence: 99%

Extending the scanning angle of a phased array antenna by using a null-space medium

Sun

2014

Sci Rep

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By introducing a columnar null-space region as the reference space, we design a radome that can extend the scanning angle of a phased array antenna (PAA) by a predetermined relationship (e.g. a linear relationship between the incident angle and steered output angle can be achieved). After some approximation, we only need two homogeneous materials to construct the proposed radome layer by layer. This kind of medium is called a null-space medium, which has been studied and fabricated for realizing hyper-lenses and some other devices. Numerical simulations verify the performance of our radome.

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Section: Methodsmentioning

confidence: 99%

Extending the scanning angle of a phased array antenna by using a null-space medium

Sun

2014

Sci Rep

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“…For a DC magnetic field, a DC magnetic hose is similar to ONM . If we make a compression finite embedded transformation (FET) inside a DC magnetic hose, we can obtain a DC magnetic funnel that can concentrate the input DC magnetic flux …”

Section: New Branches From Tomentioning

confidence: 99%

Transformation Optics: From Classic Theory and Applications to its New Branches

Sun

Zheng

Chen

et al. 2017

Laser & Photonics Reviews

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In the modern world, the ability to manipulate and control electromagnetic waves has greatly changed people's lives. Novel optical and electromagnetic phenomena and devices will lead to new scientific trends and techniques in the future. The exploration of new theories of optical design and new materials for optical engineering has attracted great attention in recent years. Transformation optics (TO) provides a new way to design optical devices with extraordinary predesigned functions such as invisibility cloaks and electromagnetic wormholes. As the development of artificial electromagnetic media (e.g. metamaterials and metasurfaces) progresses, many of these novel optical devices designed by TO have been experimentally demonstrated and used in specific applications. Starting from the basic theory of transformation optics, we review its applications, extensions, new branches and recent developments in this paper.

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“…Following the discovery of transformation optics technique and the development of metamaterials for the control of electromagnetic waves [1][2][3], magnetic metamaterials have recently been introduced. They have led to interesting new properties and devices for controlling magnetostatic fields [4,5], including magnetic cloaks [4,[6][7][8][9][10][11][12][13], magnetic concentrators [14][15][16][17][18][19], and other novel magnetic phenomena [5,[20][21][22]. The use of metamaterials is particularly attractive in magnetostatics because of at least two properties.…”

Section: Introductionmentioning

confidence: 99%

Negative permeability in magnetostatics and its experimental demonstration

et al. 2017

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The control of magnetic fields, essential for our science and technology, is currently achieved by magnetic materials with positive permeability, including ferromagnetic, paramagnetic, and diamagnetic types. Here we introduce materials with negative static permeability as a new paradigm for manipulating magnetic fields. As a first step, we extend the solutions of Maxwell magnetostatic equations to include negative-permeability values. The understanding of these new solutions allow us to devise a negative-permeability material as a suitably tailored set of currents arranged in space, overcoming the fact that passive materials with negative permeability do no exist in magnetostatics. We confirm the theory by experimentally creating a spherical shell that emulates a negative-permeability material in a uniform magnetic field. Our results open new possibilities for creating and manipulating magnetic fields, which can be useful for practical applications.

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Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Cited by 13 publications

References 28 publications

Extending the scanning angle of a phased array antenna by using a null-space medium

Extending the scanning angle of a phased array antenna by using a null-space medium

Transformation Optics: From Classic Theory and Applications to its New Branches

Negative permeability in magnetostatics and its experimental demonstration

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