Thermal metamaterials: functions and prospects

Sklan, Sophia R.; Li, Baowen

doi:10.1093/nsr/nwy005

Cited by 62 publications

(32 citation statements)

References 10 publications

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“…The ability to cloak a region of space so that an incident field or applied loading does not see or feel the presence of an object is of great interest in science and engineering. Over the last two decades, significant progress has been made in this field in the domains of electromagnetism [1,2], acoustics [3,4], heat transport [5] and flexural waves on thin plates [6,7]. Cloaking of elastic waves however, even in the quasi-static limit requires materials with properties that are, at present, unachievable.…”

Section: Introductionmentioning

confidence: 99%

Static elastic cloaking, low-frequency elastic wave transparency and neutral inclusions

Norris

Parnell

2020

Proc. R. Soc. A.

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New connections between static elastic cloaking, low-frequency elastic wave scattering and neutral inclusions (NIs) are established in the context of two-dimensional elasticity. A cylindrical core surrounded by a cylindrical shell is embedded in a uniform elastic matrix. Given the core and matrix properties, we answer the questions of how to select the shell material such that (i) it acts as a static elastic cloak, and (ii) it eliminates low-frequency scattering of incident elastic waves. It is shown that static cloaking (i) requires an anisotropic shell, whereas scattering reduction (ii) can be satisfied more simply with isotropic materials. Implicit solutions for the shell material are obtained by considering the core–shell composite cylinder as a neutral elastic inclusion. Two types of NI are distinguished, weak and strong with the former equivalent to low-frequency transparency and the classical Christensen and Lo generalized self-consistent result for in-plane shear from 1979. Our introduction of the strong NI is an important extension of this result in that we show that standard anisotropic shells can act as perfect static cloaks, contrasting previous work that has employed ‘unphysical’ materials. The relationships between low-frequency transparency, static cloaking and NIs provide the material designer with options for achieving elastic cloaking in the quasi-static limit.

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Section: Introductionmentioning

confidence: 99%

Static elastic cloaking, low-frequency elastic wave transparency and neutral inclusions

Norris

Parnell

2020

Proc. R. Soc. A.

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“…Until now, metamaterials have been mainly associated with electromagnetism and optics [3], and only recently similar concepts have been also applied to other wave phenomena, i.e. thermodynamics [4]. Such works are mostly theoretical [5], and experiments are still in their infancy [6].…”

Section: Introductionmentioning

confidence: 99%

Metamaterials for electromagnetic and thermal waves

Donnelly

Durant

Lacoste

et al. 2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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In the last decade, electromagnetic metamaterials, thanks to their exotic properties and the possibility to control electromagnetic waves at will, become crucial building blocks to develop new and advanced technologies in several practical applications. Even though until now the metamaterial concept has been mostly associated with electromagnetism and optics; the same concepts can be also applied to other wave phenomena, such as thermodynamics. For this reason, here the aim is to realize a multi-functional metamaterial able to control and manipulate simultaneously both electromagnetic and thermal waves. The structure is, first, designed and fabricated by using additive manufacturing techniques. Then, it is tested for the following industrial applications: sensing and medical diagnostics (optical and thermal imaging), military/safety (electromagnetic and thermal guiding structures) and automotive (electrical vehicles battery electric and thermal management). Experimental results reveal that such multifunctional metamaterial can fully manipulate and process both electromagnetic and thermal waves at will. The proposed structure appears to be highly versatile and scalable, with great potential to be used also for other wave phenomena such as mechanics, acoustics and hydrodynamics.

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“…Metamaterials are engineered composites consisting of tailored subwavelength meta-atoms (inclusions) for controlling wave phenomena at will. During the last two decades, metamaterials have attracted great interest from researchers working in different fields of physics, which has resulted in an important impact on fundamental science and the emergence of numerous fascinating concepts [1][2][3][4][5]. Nevertheless, there is no universal approach to the synthesis of arbitrary complex metamaterials, mainly due to the two following reasons.…”

Section: Introductionmentioning

confidence: 99%

Modular Analysis of Arbitrary Dipolar Scatterers

Asadchy

Tretyakov

2019

Phys. Rev. Applied

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Within the paradigm of metamaterials and metasurfaces, the electromagnetic properties of composite materials can be engineered by shaping or modulating their constituents, the so-called meta-atoms. Synthesis and analysis of complex-shaped meta-atoms with general polarization properties is a challenging task. In this paper, we demonstrate that the most general dipolar response of any small object can be conceptually decomposed into a set of basic fundamental polarization phenomena, which enables immediate all-direction characterization of the electromagnetic properties of arbitrary linear materials and metamaterials. The proposed platform for modular characterization is tested on several examples of bianisotropic and nonreciprocal meta-atoms. As a demonstration of the potential of this modular analysis, we use it to design a single-layer metasurface of vanishing thickness with unitary circular dichroism. The analysis approach developed in this paper is supported by a ready-to-use computational code and can be further extended to meta-atoms engineered for other types of wave interactions, such as in acoustics and mechanics.

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Thermal metamaterials: functions and prospects

Cited by 62 publications

References 10 publications

Static elastic cloaking, low-frequency elastic wave transparency and neutral inclusions

Static elastic cloaking, low-frequency elastic wave transparency and neutral inclusions

Metamaterials for electromagnetic and thermal waves

Modular Analysis of Arbitrary Dipolar Scatterers

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