Optic-null space medium for cover-up cloaking without any negative refraction index materials

Sun, Fei; He, Sailing

doi:10.1038/srep29280

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…Two surfaces linked by optic-null medium (ONM) are equivalent surfaces in OST [18]. OST is broadly applicable in the design of lenses [18,20], electromagnetic open resonators [21], overlapped illusions [22], waveguide bends [23], scattering cover-up cloaks [24], subwavelength focusing [25], etc. ONM has extremely large permittivity and permeability along its main axis, and close to zero in orthogonal directions.…”

Section: Theoretical Methodsmentioning

confidence: 99%

A Camouflage Device Without Metamaterials

Sun¹,

Zhang²,

Evans³

et al. 2019

PIER

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We propose a camouflage device that can greatly reduce scattering in the microwave frequency using only uniform copper plates with no internal structuring (no metamaterials). The camouflage device is designed by optical surface transformation (OST), which is derived from transformation optics but much simpler than transformation optics. The key of our design is to choose suitable arrangement and lengths of these copper plates that satisfy Fabry-Perot condition. The proposed camouflage device can work when the detecting wave comes from a wide-angle range (not only works for some discrete angles). The proposed method will give a new and simple way to design and realize camouflage device.

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Section: Theoretical Methodsmentioning

confidence: 99%

A Camouflage Device Without Metamaterials

Sun¹,

Zhang²,

Evans³

et al. 2019

PIER

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“…Whatever the shapes and locations of the concealed objects inside the ONM, the system (the concealed objects, the background PEC in the center, and the ONM) appears like a large PEC with the same boundary as the outside boundary of the ONM (Figure b). This means that when a detecting plane wave is incident onto the cloak (Figure a) and a large PEC background object (PEC in reference space in Figure b), the scattering electric fields should be exactly the same . An outside observer can only see the large PEC background object without seeing the concealed objects (the moon and heart in Figure a) inside the cloak.…”

Section: New Branches From Tomentioning

confidence: 99%

“…This means that when a detecting plane wave is incident onto the cloak (Figure 15a) and a large PEC background object (PEC in reference space in Figure 15b), the scattering electric fields should be exactly the same. [200] An outside observer can only see the large PEC background object without seeing the concealed objects (the moon and heart in Figure 15a) inside the cloak. We should note that we have two background objects: one is the real background object wrapped inside the cloak (the PEC with a small radius R 1 in the center of the ONM in Figure 15a).…”

Section: The Scattering Cover-up Cloak By An Ostmentioning

confidence: 99%

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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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Fast Adaptive Thermal Buffering by a Passive Open Shell Based on Transformation Thermodynamics

Liu

Sun

2018

Advcd Theory and Sims

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By using transformation thermodynamics, an open, adaptive thermal buffer shell (TBS) is designed and experimentally implemented with natural materials (layered copper and expanded polystyrene [EPS]). The TBS can store excessive heat flux quickly in the shell and release it slowly when it is needed, which also has some distinctive features: first it is a buffer shell that can avoid external extremes in temperature (either high or low) and also provide a relatively stable temperature for the interior of the shell when the temperature outside the shell has some fluctuations; second the TBS is not thermally insulated (with holes connected to the outside world) and the buffering effect of the TBS originates from the heat recycling mechanics, not thermal insulation; third the TBS has a short response time and the temperature inside the shell can be quickly adjusted according to the average temperature outside the shell; fourth the TBS is a passive device. Unlike traditional air conditioning, the TBS can work without an external power supply. The TBS will have many applications in energy recycling systems, smart heat controlling systems, and passive heat self-adaptation systems. Numerical simulations and experimental demonstrations are given to verify the function of the TBS.In the times of energy shortage, the recycling of heat energy becomes more and more important. Therefore, how to handle the heat dissipation, the heat storage, and thereby give an effective control of heat flux becomes an important subject. For some applications, it is desirable for heat to dissipate as quickly as possible, such as the heat generated on chips. For other applications, though, enough heat must be retained to resist cold. However, heat generated in the first case is usually wasted and seldom reused for the second case because these two situations occur

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Optic-null space medium for cover-up cloaking without any negative refraction index materials

Cited by 9 publications

References 23 publications

A Camouflage Device Without Metamaterials

A Camouflage Device Without Metamaterials

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

Fast Adaptive Thermal Buffering by a Passive Open Shell Based on Transformation Thermodynamics

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