Near-field radiation between graphene-covered carbon nanotube arrays

Zhang, Richard Z.; Liu, Xianglei; Zhang, Zhuomin M.

doi:10.1063/1.4913993

Cited by 17 publications

(9 citation statements)

References 63 publications

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“…[1][2][3][4] Especially, the power flux can exceed the blackbody limit by several orders in magnitude if surface polaritons or hyperbolic modes can be excited. [5][6][7][8][9][10] The enhanced radiative heat transfer in the near field has been shown to have promising applications in therophotovoltaics, [11][12][13] thermal rectification, 14 noncontact refrigeration, 15 and thermal transistor, 16 to name a few.…”

Section: Introductionmentioning

confidence: 99%

Influence of hBN orientation on the near-field radiative heat transfer between graphene/hBN heterostructures

Zhang

2018

J. Photon. Energy

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The influence of the optic axis orientation of hexagonal boron nitride (hBN) on the near-field radiative heat transfer between hBN slabs as well as between graphene/hBN heterostructures is studied. A modified 4 × 4 transfer matrix method is employed to calculate the nearfield radiative heat flux (NFRHF) between the media. The numerical results show that the NFRHF will decrease when the optic axis of hBN is tilted off the direction of the energy flow for bare hBN slabs. The reason is that hyperbolic phonon polaritons excited in the hyperbolic bands of type I are largely suppressed for tilted optic axis, though surface phonon polaritons can be excited in the hyperbolic bands. On the contrary, the NFRHF between two graphene/ hBN heterostructures is affected by the coupling of SPPs excited at the vacuum/graphene interface with those at the graphene/hBN interface and the formation of a hybrid mode, by which the NFRHF is maximum when the hBN slabs are arranged with strong in-plane anisotropy of the surface. The results obtained in this work may provide a promising way for manipulating nearfield radiative heat transfer between anisotropic materials.

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Section: Introductionmentioning

confidence: 99%

Influence of hBN orientation on the near-field radiative heat transfer between graphene/hBN heterostructures

Zhang

2018

J. Photon. Energy

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“…These systems exploit the exceptional optical properties of graphene [50,51]. More specifically, the radiative heat transfer between suspended graphene sheets has been analyzed [29,43], as well as in configurations where graphene is deposited either on dielectric substrates [26-28, 31, 33, 35, 45, 49] or on metamaterials [36,38,39,41,42,48]. Beside these fundamental develpements, the graphene sheets has also been considered for several applicative purposes, such as thermophotovoltaic conversion [30,32,37,40,47], thermal rectification [44] and heat transfer amplification [46].…”

Section: Introductionmentioning

confidence: 99%

Graphene-based amplification and tuning of near-field radiative heat transfer between dissimilar polar materials

et al. 2017

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The radiative heat transfer between two dielectrics can be strongly enhanced in the near field in the presence of surface phonon-polariton resonances. Nevertheless, the spectral mismatch between the surface modes supported by two dissimilar materials is responsible for a dramatic reduction of the radiative heat flux they exchange. In the present paper we study how the presence of a graphene sheet, deposited on the material supporting the surface wave of lowest frequency, allows to widely tune the radiative heat transfer, producing an amplification factor going up to one order of magnitude. By analyzing the Landauer energy transmission coefficients we demonstrate that this amplification results from the interplay between the delocalized plasmon supported by graphene and the surface polaritons of the two dielectrics. We finally show that the effect we highlight is robust with respect to the frequency mismatch, paving the way to an active tuning and amplification of near-field radiative heat transfer in different configurations.

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“…Note that e is the elementary charge and μ is the chemical potential. Relaxation time τ = 100 fs and T = 310 K are used in our work unless otherwise specified . The above expression is widely adopted, for example, in refs and − , and it has also been used to interpret many experimental data successfully (see, e.g., refs − ).…”

Section: Theorymentioning

confidence: 99%

“…Relaxation time τ = 100 fs and T = 310 K are used in our work unless otherwise specified. 21 The above expression is widely adopted, for example, in refs 20 and 22−24, and it has also been used to interpret many experimental data successfully (see, e.g., refs 25−27). Figure 1b shows the schematic of the multilayer graphene-hBN heterostructures.…”

Section: ■ Theorymentioning

confidence: 99%

Enhanced Near-Field Thermal Radiation Based on Multilayer Graphene-hBN Heterostructures

2017

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Graphene-covered hexagonal boron nitride (hBN) can exceed blackbody thermal radiation in near-field due to the coupling of surface plasmon polaritons (SPPs) and hyperbolic phonon polaritons (HPPs). As previous research found that the thickness of hBN in a graphene-hBN cell can be very thin while still presenting strong radiation enhancement, multilayer graphene-hBN heterostructures are proposed in this paper to further enhance the near-field thermal radiation. We found that a heterostructure consisting of five or more graphene-hBN cells performs better than all existing graphene-hBN configurations, and the infinite cell limit exhibits 1.87- and 2.94-fold larger heat flux at 10 nm separation than sandwich and monocell structures do, respectively, due to the continuously and perfectly coupled modes. The heat flux is found to be 4 orders of magnitude larger than that of the blackbody. The effective tunability of the thermal radiation of the multicell structure is also observed by adjusting the chemical potentials of graphene with an optimized thickness of 20 nm on each hBN, which is instructive for both experimental design and fabrication of thermal radiation devices.

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Near-field radiation between graphene-covered carbon nanotube arrays

Cited by 17 publications

References 63 publications

Influence of hBN orientation on the near-field radiative heat transfer between graphene/hBN heterostructures

Influence of hBN orientation on the near-field radiative heat transfer between graphene/hBN heterostructures

Graphene-based amplification and tuning of near-field radiative heat transfer between dissimilar polar materials

Enhanced Near-Field Thermal Radiation Based on Multilayer Graphene-hBN Heterostructures

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