Transient heat flux shielding using thermal metamaterials

Narayana, Supradeep; Savo, Salvatore; Sato, Yuki

doi:10.1063/1.4807744

Cited by 102 publications

(114 citation statements)

References 12 publications

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“…35 This need requires addressing the general time-dependent heat diffusion equation, that is, rc Á qu/qt ¼ r Á (kru), where r and c are the density and the specific heat capacity of the medium, respectively. 15,16,18,22,23 This equation describes the heat diffusion in a solid out of the source region. Applying a coordinate mapping from the virtual (x, y) into the physical (x 0 , y 0 ) spaces, Guenneau et al 15 first derived the transformed medium that equally satisfied the heat equation with the new material parameters r 0 c 0 ¼ rc/det(J) and j 0 ¼ JkJ T / det(J), where J is the Jacobean matrix expressed by q(x 0 , y 0 )/q(x, y).…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] The TO technique has also led to the creation of many other important EM devices with functionalities previously deemed impossible or unconceivable. [9][10][11] In general, this coordinate operation can be applied to different partial differential equations governing the behaviors of other physical phenomena such as thermal flux, [12][13][14][15][16][17][18][19][20][21][22][23] acoustic wave, [24][25][26][27] and matter or quantum [28][29][30] waves, demonstrating important scientific and application potentials.…”

Section: Introductionmentioning

confidence: 99%

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A transient thermal cloak experimentally realized through a rescaled diffusion equation with anisotropic thermal diffusivity

et al. 2013

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Transformation optics has made a major contribution to the advancement of modern electromagnetism and related research assisted by the development of metamaterials. In this work, we applied this concept to the thermodynamics using the coordinate transformation to the time-dependent heat diffusion equation to manipulate the heat flux by predefined diffusion paths. Experimentally, we demonstrated a transient thermal cloaking device engineered with effective thermal materials and successfully hid a centimeter-sized vacuum cavity. A rescaled heat equation accounting for all the pertinent parameters of various ingredient materials was proposed to greatly facilitate the fabrication. Our results unambiguously demonstrate the practical possibility of implementing complex transformed thermal media with high accuracy and acquiring several unprecedented thermodynamic functions, which we believe will help to broaden the current research and pave a new path to manipulate heat for novel device applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A transient thermal cloak experimentally realized through a rescaled diffusion equation with anisotropic thermal diffusivity

et al. 2013

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“…[15][16][17] Recently, there is a progress in managing phonons by nanostructured phononic crystals (PnCs) [18][19][20][21][22][23] which control heat by making use of phononic properties. It heralds the next technological revolution in phononics, such as thermal rectifiers, [15,[24][25][26][27][28][29] optomechanical crystals, [30,31] thermal cloaking, [32][33][34][35][36] thermoelectrics, [37][38][39][40][41] and thermocrystals. [18,21,22] When the characteristic size of nanostructured PnCs is closed to the wavelength of phonons, PnCs may manipulate the phonon band structures which lead to the phonon confinement.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the temperature dependence of the thermal conductivity of graphene phononic crystal

Yang

et al. 2016

Nanotechnology

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By using non-equilibrium molecular dynamics simulations (NEMD), the modulation on temperature dependence of thermal conductivity of graphene phononic crystals (GPnCs) are investigated. It is found that the temperature dependence of thermal conductivity of GPnCs follows ~ T -α behavior. The power exponents (α) can be efficiently tuned by changing the characteristic size of GPnCs. The phonon participation ratio spectra and dispersion relation reveal that the long-range phonon modes are more affected in GPnCs with larger size of holes (L0). Our results suggest that constructing GPnCs is an effective method to manipulate the temperature dependence of thermal conductivity of graphene, which would be beneficial for developing GPnCs-based thermal management and signal processing devices.

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“…[27][28][29][30][31][32][33][34][35][36][37] However, these devices were designed to cloak an object in a single physical fi eld.…”

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confidence: 99%

Invisible Sensors: Simultaneous Sensing and Camouflaging in Multiphysical Fields

et al. 2015

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maintaining its receiving ability. However, this technique is only valid for a single physical fi eld, e.g., an invisible electromagnetic sensor or an invisible acoustic detector. [2][3][4] Consequently, a single-functional sensor is invisible to an acoustic monitoring receiver, but it can be easily detected using a remote thermal imager. Is it possible to create a sensor that is invisible in multiple physical fi elds while maintaining the same sensing functionality? This is very challenging, if not impossible, to achieve, even using the concept of metamaterials, which are man-made composites that control waves and energy fl ux in unprecedented ways, resulting in exotic behaviors that are absent in nature. For example, electromagnetic metamaterials were proposed to manipulate electromagnetic waves and produce an invisibility cloak. [5][6][7] This pioneering idea motivated a number of significant applications, such as the wave concentrator and rotator. [8][9][10] Other than the electromagnetic waves, metamaterials have been created to manipulate other waves such as acoustic waves, [11][12][13] elastic waves, [ 14,15 ] magnetostatic fi elds, [ 16 ] and static forces.[ 17 ]More recently, metamaterials were presented that control the DC current [18][19][20][21][22][23][24][25][26] and the heat fl ux. [27][28][29][30][31][32][33][34][35][36][37] However, these devices were designed to cloak an object in a single physical fi eld.Advanced and multifunctional metamaterials are highly desirable for most practical applications. More recently, some attempts to cloak an object in multiple physical fi elds have been made, in particular, the bifunctional thermalelectric invisibility cloak [ 38 ] and independent manipulation [ 39 ] were proposed. Later, the fi rst experiment was carried out to simultaneously cloak an air cavity in the electric and thermal fi elds. [ 40 ] This sample was fabricated through a sophisticated man-made metamaterial structure with many holes drilled in a silicon plate that were, then, fi lled with poly(dimethylsiloxane) (PDMS). In our work, we found that natural materials with simple structure can also simultaneously manipulate multiphysical fi elds. We fabricated a device that acted as a "mask" for both thermal and electric fi elds and behaved as a multifunctional invisible sensor.To date, the theory of "cloaking a sensor" is only valid for a single physical fi eld. [ 1 ] In this study, we present the fi rst invisible sensor theory for static multiphysical-fi eld. This multiphysical invisible sensor has three features that distinguish it from conventional DC and thermal metamaterial devices, especially different from the bifunctional cloak for an air cavity. [ 40 ] First, we allow the sensor to "see through and behind" the cloaked region in multiphysical fi elds. As a result, the sensor is invisible and receives proportional incoming signals at the same time, and it is able to "open its eyes" behind the cloak to receive information from the outside multiphysical When a sensor is used to probe a ph...

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Transient heat flux shielding using thermal metamaterials

Cited by 102 publications

References 12 publications

A transient thermal cloak experimentally realized through a rescaled diffusion equation with anisotropic thermal diffusivity

A transient thermal cloak experimentally realized through a rescaled diffusion equation with anisotropic thermal diffusivity

Manipulating the temperature dependence of the thermal conductivity of graphene phononic crystal

Invisible Sensors: Simultaneous Sensing and Camouflaging in Multiphysical Fields

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