Tuning coherent radiative thermal conductance in multilayer photonic crystals

Lau, Wah Tung; Shen, Jung-Tsung; Veronis, Georgios; Fan, Shanhui

doi:10.1063/1.2890433

Cited by 19 publications

(26 citation statements)

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“…For example, the impact of dissipation of thin layers was discussed [61] as well as the impact of surface-polariton coupling inside thin metal [62] and later also dielectric [63,64] coatings. Real multilayer structures were discussed in the context of heat radiation between two photonic crystals [65,66] and inside of photonic crystals [66][67][68]. The contribution of surface Bloch modes was quantified [69,70] and the S-matrix and impedance method where introduced for near-field heat transfer calculations [71,72].…”

Section: Introductionmentioning

confidence: 99%

Near-Field Heat Transfer between Multilayer Hyperbolic Metamaterials

Biehs

Ben‐Abdallah

2016

Zeitschrift Für Naturforschung A

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Abstract:We review the near-field radiative heat flux between hyperbolic materials focusing on multilayer hyperbolic meta-materials. We discuss the formation of the hyperbolic bands, the impact of ordering of the multilayer slabs, as well as the impact of the first single layer on the heat transfer. Furthermore, we compare the contribution of surface modes to that of hyperbolic modes. Finally, we also compare the exact results with predictions from effective medium theory.

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Section: Introductionmentioning

confidence: 99%

Near-Field Heat Transfer between Multilayer Hyperbolic Metamaterials

Biehs

Ben‐Abdallah

2016

Zeitschrift Für Naturforschung A

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“…With today's nanofabrication techniques it is possible to manufacture artificial materials such as photonic band gap materials and metamaterials which exhibit very unusual material properties like negative refraction [23]. Due to such properties they are considered as good candidates for perfect lensing [24,25], for repulsive Casimir forces [26][27][28][29] and enhanced or tunable radiative heat flux at the nanoscale [18][19][20][30][31][32] to mention a few.There exists a class of uniaxial metamaterials for which the permittivity and permeability tensor elements are not all of the same sign [33]. In particular, for such materials the dispersion relation for the solutions of Helmholtz's equation inside the material is not an ellipsoid as for normal uniaxial materials [34] but a hyperboloid [35].…”

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confidence: 99%

Hyperbolic Metamaterials as an Analog of a Blackbody in the Near Field

2012

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We study the near-field heat exchange between hyperbolic materials and demonstrate that these media are able to support broadband frustrated modes which transport heat by photon tunnelling with a high efficiency close to the theoretical limit. We predict that hyperbolic materials can be designed to be perfect thermal emitters at nanoscale and derive the near-field analog of the blackbody limit.PACS numbers: 44.40.+a;81.05.Xj A black body is usually defined by its property of having a maximum absorptivity and therefore also a maximum emissivity by virtue of Kirchhoff's law [1]. The energy transmission between two black bodies having different temperatures obey the well-known Stefan-Boltzmann law. This law sets an upper limit for the power which can be transmitted by real materials, but it is itself a limit for the far-field only, since it takes only propagating modes into account. In terms of the energy transmission between two bodies the black body case corresponds to maximum transmission for all allowed frequencies ω and all wave vectors smaller than ω/c, where c is the vacuum light velocity. This means that all the propagating modes are perfectly transmitted across the separation gap.In the near-field regime, i.e., for distances smaller than the thermal wavelength λ th = c/k B T (2π is Planck's constant, k B is Boltzmann's constant, and T is the temperature) the radiative heat flux is not due to the propagating modes, but it is dominated by evanescent waves [2-4] and especially surface polaritons as confirmed by recent experiments [5][6][7][8][9][10][11]. The common paradigm is that the largest heat flux can be achieved when the materials support surface polaritons which will give a resonant energy transfer restricted to a small frequency band around the surface mode resonance frequency [3,4,12,13]. Many researchers have tried to find materials enhancing the nanoscale heat flux due to the contribution of the coupled surface modes by using layered materials [14,15] In the present work the aim is twofold: (i) We show, that materials supporting a broad band of evanescent frustrated modes can outperform the heat flux due to surface modes. This provides new possibilies for designing materials giving large nanoscale heat fluxes which could be used for thermal management at the nanoscale for instance. (ii) We derive a general limit for the heat flux carried by the frustrated modes and show that it is, in fact, the near-field analog of the usual black body limit. For the evanescent modes a near field analog of a black body can be defined in the sense that the energy transmission coefficient must be equal to one for all frequencies and all wave vectors larger than ω/c. With today's nanofabrication techniques it is possible to manufacture artificial materials such as photonic band gap materials and metamaterials which exhibit very unusual material properties like negative refraction [23]. Due to such properties they are considered as good candidates for perfect lensing [24,25], for repulsive Casimir forces [26][27][28][...

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“…and T p (ω, κ; d) are the energy transmission coefficients for the s-and p-polarized modes which can be easily determined for semi-infinite materials, anisotropic materials and multilayer structures 19,[38][39][40][41][42][43][44][45][46][47] .…”

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confidence: 99%

Super-Planckian near-field thermal emission with phonon-polaritonic hyperbolic metamaterials

Biehs

Tschikin

Messina

et al. 2013

Applied Physics Letters

178

124

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We study super-Planckian near-field heat exchanges for multilayer hyperbolic metamaterials using exact S-matrix calculations. We investigate heat exchanges between two multilayer hyperbolic metamaterial structures. We show that the superPlanckian emission of such metamaterials can either come from the presence of surface phonon-polaritons modes or from a continuum of hyperbolic modes depending on the choice of composite materials as well as the structural configuration.In the last few years several fascinating experiments have demonstrated that for small separation distances compared with the thermal wavelength the thermal radiation exchanged between two hot bodies out of thermal equilibrium increases dramatically compared with what we observe at large distances and can even exceed the well-known Stefan-Boltzmann law by orders of magnitude 1-6 . Accordingly, thermal emission is in that case also called super-Planckian emission emphasizing the possibility to go beyond the classical black-body theory. There are several promising applications of super-Planckian emitters ranging from thermal imaging 7-9 and thermal rectification/management 10-12 to near-field thermophotovoltaics 13-17 . This has triggered many studies on the possibilities of tailoring and controlling the super-Planckian radiation spectrum by means of designing the material properties 18-23 , using phase-change materials 24 or 2D systems such as graphene 25,26 , for instance.Recently, it was shown that hyperbolic metamaterials can lead to broad-band photonic thermal conductance inside the material itself 27 and between two hyperbolic materials only separated by a vacuum gap 28 . Further Nefedov et al. considered nanorod-like structures

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Tuning coherent radiative thermal conductance in multilayer photonic crystals

Cited by 19 publications

References 9 publications

Near-Field Heat Transfer between Multilayer Hyperbolic Metamaterials

Near-Field Heat Transfer between Multilayer Hyperbolic Metamaterials

Hyperbolic Metamaterials as an Analog of a Blackbody in the Near Field

Super-Planckian near-field thermal emission with phonon-polaritonic hyperbolic metamaterials

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