Giant radiation heat transfer through micron gaps

Nefedov, Igor S.; Simovski, Constantin

doi:10.1103/physrevb.84.195459

Cited by 91 publications

(96 citation statements)

References 39 publications

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“…Metal nanowires filling a vacuum gap between two surfaces -a hot surface of a thermal emitter and a cold surface of a semiconductor -strongly enhance the radiative heat transfer from the emitter to the semiconductor. This effect in accordance to [10][11][12] theoretically results from the conversion of evanescent TM-polarized waves created by the emitter into quasi-TEM waves propagating along the nanowires. As a result, very high spatial harmonics normally concentrated at the emitter surface become propagating and carry significant additional energy.…”

Section: Introductionmentioning

confidence: 58%

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Multi-Mode Broadband Power Transfer Through a Wire Medium Slab (Invited Paper)

Vovchuk¹,

Kosulnikov²,

Nefedov³

et al. 2015

PIER

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Abstract-It is known that slabs of wire media -dense arrays of thin conducting wires -can transport electromagnetic energy of evanescent plane waves over the slab thickness. This phenomenon was successfully used in superlenses and endoscopes. However, in the known configurations the effective energy transfer takes place only at the Fabry-Perot (thickness) resonances of the slab, making broadband power transfer impossible. In this paper we experimentally demonstrate that power transfer by a wire medium slab can be very broadband, whereas the Fabry-Perot resonances are damped, provided that the wires of the wire medium slab extend into the power-emitting body. As a testbed system we have used two rectangular waveguides and demonstrated that a properly designed and positioned wire medium slab transfers modes of any polarization from the input to the output waveguides. This study is relevant to emerging applications where broadband transport of reactive-field energy is required, especially in enhancing and controlling radiative heat flows in thermophotovoltaic systems.

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Section: Introductionmentioning

confidence: 58%

“…However, in works [10][11][12] it was theoretically predicted that broadband energy transfer through a WM slab is possible, if the wires extend into the volume of the radiating object. The effect is useful for so-called thermophotovoltaic systems [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Multi-Mode Broadband Power Transfer Through a Wire Medium Slab (Invited Paper)

Vovchuk¹,

Kosulnikov²,

Nefedov³

et al. 2015

PIER

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“…made of nanotubes which are interlocked and highlighted a giant radiative heat flux which could be utilized for near-field thermophotovoltaics energy conversion 29 . Finally, Guo et al.…”

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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

177

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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“…Unique properties of HM can lead to a wide variety of applications; among these are negative refraction [10,11], subwavelength imaging [12][13][14][15][16][17], spontaneous and thermal emission engineering [18][19][20][21], and broadband light trapping [22,23]. Very high density of photonic states in HM [24][25][26] ensures effective radiative heat transfer [4][5][6] and allows for a nanosized heating/cooling devices.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Broadband Light Absorber Based on Nonuniform Hyperbolic Metamaterial Film

Zharova

Zharov

2018

Advances in Condensed Matter Physics

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We develop a concept of highly efficient broadband light absorber based on nonuniform hyperbolic metamaterial. We suggest a gradual bending of the anisotropy axis inside the metamaterial that results in spatial shift of the area of resonant absorption depending on the incidence angle. In this resonant region the wavevector of light is parallel to the generatrix of resonant cone and the radiation losses are maximal because of extremely high value of refraction index. Changing the radiation frequency also shifts the spatial position of the resonant region so that high level of absorption may be achieved in wide frequency range. Using the model of nanowire medium (silver wires in silica host) we predict that 200 nm film of this hyperbolic metamaterial allows reaching almost total absorption of radiation throughout the visible band.

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Giant radiation heat transfer through micron gaps

Cited by 91 publications

References 39 publications

Multi-Mode Broadband Power Transfer Through a Wire Medium Slab (Invited Paper)

Multi-Mode Broadband Power Transfer Through a Wire Medium Slab (Invited Paper)

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

Highly Efficient Broadband Light Absorber Based on Nonuniform Hyperbolic Metamaterial Film

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