Dual-function thermoelastic cloak based on coordinate transformation theory

Tian, Yuze; Wang, Yanfeng; Huang, Gan-Yun; Laude, Vincent; Wang, Yue-Sheng

doi:10.1016/j.ijheatmasstransfer.2022.123128

Cited by 5 publications

(1 citation statement)

References 59 publications

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“…Metamaterials have attracted great attention owing to their extensive functionality 1 . Various novel applications have been reported and implemented during the last decade, including wave regulation [2][3][4][5] , heat flow management 6 , invisibility cloaking 7,8 , holographic imaging 9 and non-destructive evaluation 10,11 . Information processing based on metamaterials [12][13][14] is currently emerging, accompanied with a rising demand on minimization, integration, and increased information capacity.…”

Section: Introductionmentioning

confidence: 99%

Annular acoustic impedance metasurfaces for encrypted information storage

Tian,

Tang,

Wang

et al. 2023

Phys. Rev. Applied

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Extensive research has been devoted recently to the design of metasurfaces. Design strategies based on impedance theory stand out for power flow regulation. The designed impedance matrix is characteristic of a given pair of incident and modulated wave fields, hence providing opportunities for encrypted information storage. We consider acoustic vortices propagating along cylindrical shell waveguide as signal carriers. Within the shell waveguide, an annular acoustic impedance metasurface is introduced for encrypted information storage. Information stored in the metasurface would only be retrieved when interrogated with the correct input. Hidden messages are successfully read in numerical simulation when the three-layer model is used to implement the metasurface. A realistic structure based on Helmholtz resonant unit cells is further designed to verify experimentally the encryption storage process. This work is expected to spur more applications of impedance metasurface to acoustic holography and encrypted acoustic communications.

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Section: Introductionmentioning

confidence: 99%

Annular acoustic impedance metasurfaces for encrypted information storage

Tian,

Tang,

Wang

et al. 2023

Phys. Rev. Applied

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Transformation Thermotics and Effective Medium Theory for Thermal Conduction

Yang,

Huang

2024

Diffusionics

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In this Chapter, we embark on an exploration of the intricacies of heat conduction, primarily delving into the transformation thermotics and the effective medium theory. Beginning with the foundational Fourier’s law of heat conduction, an intriguing observation is the form invariance of the associated equations under arbitrary coordinate transformations. This symmetry elucidates a novel method for orchestrating the temperature field and heat flux dynamics. To illustrate the practical implications and operationalizability of the thermal transformation, we conceptualized and implemented a thermal cloak. It should be noted, however, that the parameters projected theoretically often manifest as inhomogeneous and anisotropic, posing considerable challenges for tangible synthesis. A viable approach to circumnavigate these challenges is to pivot the focus towards the thermally effective medium theory. In the ensuing sections, we will delve into a systematic exposition of the effective medium theory, subsequently crafting functional structures illuminated by three distinct frameworks: linear theory, wherein the thermal conductivity remains unaffected by temperature variations, nonlinear theory, and the theory of heat sources.

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Diffusion metamaterials

Zhang

et al. 2023

Nat Rev Phys

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Dual-function thermoelastic cloak based on coordinate transformation theory

Cited by 5 publications

References 59 publications

Annular acoustic impedance metasurfaces for encrypted information storage

Annular acoustic impedance metasurfaces for encrypted information storage

Transformation Thermotics and Effective Medium Theory for Thermal Conduction

Diffusion metamaterials

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