Three-dimensional illusion thermal device for location camouflage

Progress in material science has allowed the control of different physical fields in a manner that would be unachievable with ordinary materials. The development of engineered materials (the so‐called metamaterials) to control the conductive heat flux has revolutionized the manner of manipulating thermal energy and allowed the possibility of guiding the heat flux in ways difficult to accept for human intuition. Herein, a brief review regarding the recent progress and developments in thermal metamaterials conceived to perform several conductive heat flux manipulation tasks is provided. Deeply theoretical discussions concerning design methodologies are left a side, and the focus is made on the design and manufacturing feasibility of metamaterials for thermal cloaking and camouflage, heat flux concentration, and inversion, among other applications that lead to the next generation of thermal devices.

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“…Other interesting works of camouflage could be also checked in refs. [73,[98][99][100][101][102][103][104].…”

Section: Transformation Thermodynamicsmentioning

confidence: 99%

A Brief Review on Thermal Metamaterials for Cloaking and Heat Flux Manipulation

2019

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“…With the emergence of transformation thermotics and thermal metamaterials, the thermal cloak greatly attracted the interest of researchers. Based on the theory of transformation thermotics, researchers have constructed a number of varieties of thermal functional devices: for instance, thermal cloak [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ], thermal concentrator [ 13 , 14 ], thermal illusion [ 15 , 16 , 17 , 18 ], thermal camouflage [ 19 , 20 , 21 , 22 , 23 , 24 , 25 ], thermal rotator [ 26 ], and encrypted thermal printing [ 27 ]. The thermal cloak, as a typical representative of heat flux control devices, was first experimentally verified [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Thermal Cloaking in Silicon Film: A Molecular Dynamic Study

Zhang¹,

Zhang²,

Sun³

et al. 2022

Materials

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Nanoscale thermal shielding is becoming increasingly important with the miniaturization of microelectronic devices. They have important uses in the field of thermal design to isolate electronic components. Several nanoscale thermal cloaks based on graphene and crystalline silicon films have been designed and experimentally verified. No study has been found that simultaneously treats the functional region of thermal cloak by amorphization and perforation methods. Therefore, in this paper, we construct a thermal cloak by the above methods, and the ratio of thermal cloaking and response temperature is used to explore its cloaking performance under constant and dynamic temperature boundary. We find that compared with the dynamic boundary, the cloaking effect produced under the constant boundary is more obvious. Under two temperature boundaries, the thermal cloak composed of amorphous and perforated has a better performance and has the least disturbance to the background temperature field. The phonon localization effect produced by the amorphous structure is more obvious than that of the perforated structure. The phonon localization of the functional region is the main reason for the cloaking phenomenon, and the stronger the phonon localization, the lower the thermal conductivity and the more obvious the cloaking effect. Our study extends the nanoscale thermal cloak construction method and facilitates the development of other nanoscale thermal functional devices.

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“…The heat flux generated by the central sources was converted from non-parallel patterns into parallel patterns [ 23 ]. Furthermore, both 2D and 3D illusion thermal devices [ 24 , 25 ] were investigated to create location camouflages, i.e., transferring the original location characteristics to another area. However, further investigations of such techniques are needed due to the following two concentrations.…”

Section: Introductionmentioning

confidence: 99%

“…That is, the employed mediums would be changed with the positions. In addition, the classical functions could be efficient once the device profiles were determined, as the entire transformed processes [ 24 , 25 ] were based on the excited characteristic lines. Considering the inconvenience of the classical transformations and the potential applications of directed thermal diffusions, the appropriate transformed methodology that simultaneously avoids singularities and excited characteristic lines, and optimizes the entire process of the linear maps, is of particular importance in achieving highly-efficient arbitrary illusive devices.…”

Section: Introductionmentioning

confidence: 99%

Directed Thermal Diffusions through Metamaterial Source Illusion with Homogeneous Natural Media

Zhang

Jin

et al. 2018

Materials

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Owing to the utilization of transformation optics, many significant research and development achievements have expanded the applications of illusion devices into thermal fields. However, most of the current studies on relevant thermal illusions used to reshape the thermal fields are dependent of certain pre-designed geometric profiles with complicated conductivity configurations. In this paper, we propose a methodology for designing a new class of thermal source illusion devices for achieving directed thermal diffusions with natural homogeneous media. The employments of the space rotations in the linear transformation processes allow the directed thermal diffusions to be independent of the geometric profiles, and the utilization of natural homogeneous media improve the feasibility. Four schemes, with fewer types of homogeneous media filling the functional regions, are demonstrated in transient states. The expected performances are observed in each scheme. The related performance are analyzed by comparing the thermal distribution characteristics and the illusion effectiveness on the measured lines. The findings obtained in this paper see applications in the development of directed diffusions with minimal thermal loss, used in novel “multi-beam” thermal generation, thermal lenses, solar receivers, and waveguide.

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Three-dimensional illusion thermal device for location camouflage

Cited by 19 publications

References 27 publications

A Brief Review on Thermal Metamaterials for Cloaking and Heat Flux Manipulation

A Brief Review on Thermal Metamaterials for Cloaking and Heat Flux Manipulation

Nanoscale Thermal Cloaking in Silicon Film: A Molecular Dynamic Study

Directed Thermal Diffusions through Metamaterial Source Illusion with Homogeneous Natural Media

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