Thermal meta-device in analogue of zero-index photonics

Liu, Ying; Zhu, Kejia; Peng, Yu‐Gui; Li, Wei; Yang, Tianzhi; Xu, Haojun; Hong, Chen; Zhu, Xuefeng; Fan, Shanhui; Qiu, Cheng‐Wei

doi:10.1038/s41563-018-0239-6

Cited by 182 publications

(90 citation statements)

References 35 publications

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“…This advancement has shed a light on the design of metamaterials, which are a sort of artificial materials possessing intriguing properties originating from their special structures rather than their intrinsic characteristics and therefore has been rapidly theoretically generalized and applied to different physical fields such as electromagnetic [3][4][5][6], and acoustics [7]. Due to the Laplace equation holding the same form in different coordinate systems, the transformation theory can be easily extended to the conduction regime, helping to achieve the thermal cloaking effect by using inhomogeneous and anisotropic mediums [8][9][10][11][12][13][14][15][16]. Similar to the optical cloak, this type of conduction metamaterial can ensure that the object inside a cloak area does not affect the temperature gradient outside.…”

Section: Introductionmentioning

confidence: 99%

Multi-Physics Bi-Functional Intelligent Meta-Device Based on the Shape Memory Alloys

2019

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Transformation theory, succeeding in multiple transportation systems, has enlightened researchers to manipulate the field distribution by tailoring the medium’s dominant parameters in certain situations. Therefore, the science community has witnessed a boom in designing metamaterials, whose abnormal properties are induced by artificial structures rather than the components’ characteristics. However, a majority of such meta-devices are restricted to the particular physical regimes and cannot sense the changes taking place in the surrounding environment and adjust its functions accordingly. In this article we propose a multi-physics bi-functional “intelligent” meta-device which can switch its functions between an invisible cloak and a concentrator in both thermal and DC electric conduction as the ambient temperature or voltage varies. The shape memory alloys are utilized in the design to form a moveable part, which plays the crucial role in the switching effect. This work paves the way for a practicable method for obtaining a controllable gradient of heat or electric potential, and also provides guidance for efficiently designing similar intelligent meta-devices by referring to the intriguing property of shape memory alloys.

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Section: Introductionmentioning

confidence: 99%

Multi-Physics Bi-Functional Intelligent Meta-Device Based on the Shape Memory Alloys

2019

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“…Some recent works based on convection-conduction systems has shown a potential route to explore unprecedented functional devices through convective nature. For example, a distinct bilayer cloak was realized in an experiment whose inner layer is running water circulating around the core (Li et al, 2019a). In that way, the convection of water can induce an infinite effective thermal conductivity, which can be seen as an analogy of zero-index in optics.…”

Section: Ll Open Accessmentioning

confidence: 99%

Thermal Metamaterial: Fundamental, Application, and Outlook

2020

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Thermal metamaterials have amazing properties in heat transfer beyond naturally occurring materials owing to their well-designed artificial structures. The idea of thermal metamaterial has completely subverted the design of thermal functional devices and makes it possible to manipulate heat flow at will. In this perspective, we review the up-to-date progress of thermal metamaterials starting from 2008. We focus on both the key theoretical fundamentals and techniques for applications and give a perspective of scale-based classification on thermal metamaterials' theories and applications. We also discuss the junction between macroscale and microscale design methods and propose some prospects for the future trend of this field.

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“…The electromagnetic cloak 4,5 is firstly introduced to carry out concealing objects from visible light and microwave. On these pioneering works'heels, cloak is expanded to other fields like thermodynamics, [6][7][8] elastodynamics, 9,10 acoustics, 11,12 and particle diffusion. 13,14 Thermal cloak can thermally camouflage an object by means of regulating the heat flux that flows around an "invisible"region.…”

Section: Introductionmentioning

confidence: 99%

“…Different from cloakmodel in Ref. [6], whose thermal conductivity in outer layer was constant, the thermal conductivity of model in Fig. 1 in outer layer is isotropic and inhomogeneous, or is designed as a polynomial form.…”

Section: Introductionmentioning

confidence: 99%

A Reverse Thermal Cloak Design Method Based on Inverse Problem Theory

Guo¹,

Qu²,

Wang³

2020

ES Energy Environ.

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A reverse thermal cloak design method is developed based on inverse problem theory. The design of thermal conductivity distribution within a cloak can be regarded as the density-based topology optimization with that penalization parameter equals to 1. The relative density is explored using conjugate gradient method with an adjoint equation (CGMAE). A prescribed objective function is used to evaluate the design result, and the function is no larger than 6.41×10-6. The maximum deviation between background temperature with and without cloak position is no larger than 0.9% for background with uniform gradient and no larger than 5% for background with non-uniform gradient. The dimension of a cloak can also be designed in case of known material thermal conductivity to avoid complex material synthesis process. Compared with coordinate transformation, the reverse design method is able to remove anisotropy of thermal conductivity and is appropriate for design of irregularly shaped cloak. It is easy to implement programming for proposed method and can boost the flexibility of cloak design. Thus, the proposed method offers a practicable scheme for thermal cloak design to control heat conduction at will.

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Thermal meta-device in analogue of zero-index photonics

Cited by 182 publications

References 35 publications

Multi-Physics Bi-Functional Intelligent Meta-Device Based on the Shape Memory Alloys

Multi-Physics Bi-Functional Intelligent Meta-Device Based on the Shape Memory Alloys

Thermal Metamaterial: Fundamental, Application, and Outlook

A Reverse Thermal Cloak Design Method Based on Inverse Problem Theory

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