Achieving bifunctional cloak via combination of passive and active schemes

Lan, Chuwen; Bi, Ke; Gao, Zehua; Li, Bo; Zhou, Ji

doi:10.1063/1.4966950

Cited by 30 publications

(18 citation statements)

References 38 publications

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“…If the cavity is rotated or uniform external field is changed, our scheme does not work again. Compared with the existing unidirectional active cloak, [26][27][28] our scheme does not require extra sources, which is no doubt more applicable.…”

Section: Discussionmentioning

confidence: 98%

Camouflage thermotics: A cavity without disturbing heat signatures outside

Wang

Huang

2018

Journal of Applied Physics

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Cloaks can protect objects without disturbing heat signatures outside cloaks, and hence, objects are invisible to outside detection. However, cloaks themselves are visible to inside detection because they possess different heat signatures from the outside. This fact limits applications. Here, we solve this problem in thermotics by developing a different theory and then propose the scheme of thermal supercavity, a cavity without disturbing heat signatures outside. We investigate different supercavities with various shapes in two or three dimensions and validate the desired effects by simulations and experiments. We further design the scheme of super-invisibility which makes the cavity itself also invisible to inside detection. Moreover, our scheme simplifies the complicated parameters of non-circle shaped cloaks, which requires only two natural materials with a simple layer structure. Our work is useful for achieving new kinds of thermal devices, including thermal camouflage and designing similar supercavities in magnetostatics, electrostatics, particle diffusion, etc.

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Section: Discussionmentioning

confidence: 98%

Camouflage thermotics: A cavity without disturbing heat signatures outside

Wang

Huang

2018

Journal of Applied Physics

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“…eyes, antennas, airborne or satellite detectors/sensors). Over the last two decades, theoretical and experimental studies on cloaking have been conducted in several research fields such as electromagnetism 1 , 2 , thermal and electrical studies 3 , thermodynamics 4 – 7 , solid mechanics 8 , acoustics 9 – 12 , elastic 13 , 14 , and seismic wave propagation 16 – 18 .…”

Section: Introductionmentioning

confidence: 99%

“…In the case of electrostatics, such metamaterial would be a material with an anisotropic electrical conductivity 23 . An active cloaking masks (emitting) objects using active sources 2 , 7 , 24 – 28 .…”

Section: Introductionmentioning

confidence: 99%

Active cloaking and illusion of electric potentials in electrostatics

Helfrich-Schkabarenko

Ismail‐Zadeh

Sommer

2021

Sci Rep

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Cloaking and illusion has been demonstrated theoretically and experimentally in several research fields. Here we present for the first time an active exterior cloaking device in electrostatics operating in a two-horizontally-layered electroconductive domain, and use the superposition principle to cloak electric potentials. The device uses an additional current source pattern introduced on the interface between two layers to cancel the total electric potential to be measured. Also, we present an active exterior illusion device allowing for detection of a signal pattern corresponding to any arbitrarily chosen current source instead of the existing current source. The performance of the cloaking/illusion devices is demonstrated by three-dimensional models and numerical experiments using synthetic measurements of the electric potential. Sensitivities of numerical results to a noise in measured data and to a size of cloaking devices are analysed. The numerical results show quite reasonable cloaking/illusion performance, which means that a current source can be hidden electrostatically. The developed active cloaking/illusion methodology can be used in subsurface geo-exploration studies, electrical engineering, live sciences, and elsewhere.

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“…all efforts in controlling multiphysics have been confined to linear medium [22][23][24][25][26][27][28][29][30]. This approximation may not only deviate from practical situations to some extent but also limit the advancement of manipulating multiple fields.…”

mentioning

confidence: 99%

Theory for Thermoelectric Effect Control: Transformation Nonlinear Thermoelectricity

Huang

2022

Transformation Thermotics and Extended Theories

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Temperature-dependent (nonlinear) transformation thermotics provides a powerful tool for designing multifunctional, switchable, or intelligent metamaterials in diffusion systems. However, its extension to multiphysics remains studied, in which the temperature dependence of intrinsic parameters is ubiquitous. Here, we theoretically establish a temperature-dependent transformation method for controlling multiphysics. Taking thermoelectric transport as a typical case, we prove the form invariance of its temperature-dependent governing equations and formulate the corresponding transformation rules. Our finite-element simulations demonstrate robust thermoelectric cloaking, concentrating, and rotating performance in temperature-dependent backgrounds. We further design two practical applications with temperature-dependent transformation: an ambient-responsive cloak-concentrator thermoelectric device that can switch between cloaking and concentrating; an improved thermoelectric cloak with nearly-thermostat performance inside. Our theoretical frameworks and application designs may provide guidance for efficiently controlling temperature-related multiphysics and enlighten subsequent intelligent multiphysical metamaterial research.

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Achieving bifunctional cloak via combination of passive and active schemes

Cited by 30 publications

References 38 publications

Camouflage thermotics: A cavity without disturbing heat signatures outside

Camouflage thermotics: A cavity without disturbing heat signatures outside

Active cloaking and illusion of electric potentials in electrostatics

Theory for Thermoelectric Effect Control: Transformation Nonlinear Thermoelectricity

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