Overlapped optics induced perfect coherent effects

Li, Jian Jie; Zang, Xiao Fei; Mao, Junfa; Tang, Min; Zhu, Yi; Zhuang, Song Lin

doi:10.1038/srep03569

Cited by 13 publications

(11 citation statements)

References 21 publications

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“…Although this phenomenon is well-known, for a long time there were no general methods to design such an optical illusion device [1,2] which could make one object appear like another object until transformation optics (TO) [3,4] was proposed. Similar methods have been used to design other illusion devices [20][21][22][23][24][25] since then. Many novel optical devices which were deemed impossible before have been designed using TO, such as invisibility cloaks, [5][6][7][8][9][10][11] superlenses, [12][13][14] concentrators, [15][16][17] rotators, [15,18] etc.…”

Section: Illusion Opticsmentioning

confidence: 99%

Illusion Optics: Disguising with Ordinary Dielectric Materials

Liu

Guo

2018

Advanced Materials

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complementary medium by a superlens in order to cancel the scattering of object A, and then to shift another object (B) into the position of object A, therefore, when we detect the scattering pattern we will find that object A appears like object B. TO is a strict method to design illusion devices in theory. However, some restrictions should be noted: (I) Complementary media and superlenses are composed of negative index materials, which require the help of evanescent waves to fulfill the functions of illusion devices. Therefore, in order to ensure the performance of the illusion, the external device (superlens) and the object should be as close as possible (in the near field) to receive adequate evanescent waves. (II) The introduction of negative index materials inevitably makes the device loss sensitive, which is a key factor limiting its performance. (III) The material parameters of the device are very complex, including negative index materials, magnetic materials, anisotropic materials, etc. These are a few of the main reasons why these illusion devices are too difficult to put into real applications.In addition to the method of TO, a new way to artificially manipulate electromagnetic waves has been proposed in 2015 by using spatial Kramers-Kronig (KK) media. [26] This method modifies the scattering potentials in the wave vector domain and makes the scattering potentials zero in the backward direction, that is, no reflections. This method has also been employed to design absorbers and invisibility cloaks. [27][28][29][30] Due to the asymmetrical properties of the scattering potentials, these KK media always require complex materials (with loss or gain). A similar method has been proposed recently to design all-dielectric cloaks, [31] which eliminates two symmetrical areas of scattering potentials in the 2D wave vector domain to make the object invisible within a specified frequency band, and the symmetric conditions ensure that the material has no loss or gain. Besides the above method, some other methods [32,33] for cloaking and illusions are also interesting, for example, characteristic mode method, [34] metasurface method. [35] Our method has several advantages compared with the conventional TO method: first, no external devices are needed in our design because we only slightly modify the scattering potential of the object and the nearby surroundings, which is more of a cosmetic operation for an object; second, no negative refractive index materials are introduced, which is a key factor restricting the effect of the illusion; third, all of the materials are isotropic, nonmagnetic, and with relative permittivity above unity, which makes this method more feasible for real applications of illusion. Now we show the designing method by deducing the relation between the scattering amplitude and the Fourier component of the scattering potential. Considering the 2D case (in

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Section: Illusion Opticsmentioning

confidence: 99%

Illusion Optics: Disguising with Ordinary Dielectric Materials

Liu

Guo

2018

Advanced Materials

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“…Such a perfect imaging device designed by TO with NRIMs is often referred to as a superlens. [202] Many other illusion optical devices are often related with such spatial folding transformations and NRIMs, such as invisibility gates, [52] remote waveguide connectors, [62] superscatterers and superabsorbers, [49][50][51] optical shifters, [203][204][205][206] etc.…”

Section: Other Classic Devices Designed By 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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“…TO is a mathematical tool to calculate the electromagnetic parameters of one device with predefined functions by relating the material parameters and its spatial geometry based on the invariance of Maxwell's equations. Many novel optical devices have been designed using TO, such as invisibility cloaks [6][7][8][9][10][11][12], super-lenses [13][14][15], concentrators [16][17][18], rotators [16,19], and illusion devices [20][21][22][23], etc. See reference [24][25][26] for a review.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Illusion Using Materials with Isotropic and Positive Parameters

Liu

2018

Phys. Rev. Applied

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Acoustic illusion devices are usually designed using transformation optics. In this article, a new method is proposed to achieve acoustic illusions without external devices by elaborately manipulating the acoustic scattering potential of an object. The proposed method in this article is more of a "cosmetic operation" for an object, which modifies the scattered acoustic pressure distribution of the object to mimic another object by exchanging their scattering potentials in two symmetrical areas in the wave vector domain. The advantage of this method is the simplicity of material parameters: only positive isotropic mass density and bulk modulus are required, which is impossible in the conventional method of using transformation optics due to the complex material requirements (anisotropic and negative index parameters).

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Overlapped optics induced perfect coherent effects

Cited by 13 publications

References 21 publications

Illusion Optics: Disguising with Ordinary Dielectric Materials

Illusion Optics: Disguising with Ordinary Dielectric Materials

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

Acoustic Illusion Using Materials with Isotropic and Positive Parameters

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