Effectiveness of Thin Films in Lieu of Hyperbolic Metamaterials in the Near Field

Miller, Owen D.; Johnson, Steven G.; Rodríguez, Alejandro W.

doi:10.1103/physrevlett.112.157402

Cited by 93 publications

(75 citation statements)

References 51 publications

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“…This observation is in general in agreement with a recent investigation of heat transfer between hyperbolic metamaterials, which showed that a single-layer structure could operate as well or better than hyperbolic metamaterials especially in the limit of small vacuum gap sizes [39]. With the gap sizes that we consider here, there can be significant contributions from both the multi-layers and the top surfaces.…”

Section: Hybrid Polaritons In Graphene/hbn Multilayerssupporting

confidence: 78%

Near-field heat transfer between graphene/hBN multilayers

et al. 2017

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We study the radiative heat transfer between multilayer structures made by a periodic repetition of a graphene sheet and a hexagonal boron nitride (hBN) slab. Surface plasmons in a monolayer graphene can couple with a hyperbolic phonon polaritons in a single hBN film to form hybrid polaritons that can assist photon tunneling. For periodic multilayer graphene/hBN structures, the stacked metallic/dielectric array can give rise to a further effective hyperbolic behavior, in addition to the intrinsic natural hyperbolic behavior of hBN. The effective hyperbolicity can enable more hyperbolic polaritons that enhance the photon tunneling and hence the near-field heat transfer. However, the hybrid polaritons on the surface, i.e. surface plasmon-phonon polaritons, dominate the near-field heat transfer between multilayer structures when the topmost layer is graphene. The effective hyperbolic regions can be well predicted by the effective medium theory (EMT), thought EMT fails to capture the hybrid surface polaritons and results in a heat transfer rate much lower compared to the exact calculation. The chemical potential of the graphene sheets can be tuned through electrical gating and results in an additional modulation of the heat transfer. We found that the near-field heat transfer between multilayer structure does not increase monotonously with the number of layer in the stack, which provides a way to control the heat transfer rate by the number of graphene layers in the multilayer structure. The results may benefit the applications of near-field energy harvesting and radiative cooling based on hybrid polaritons in two-dimensional materials.

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Section: Hybrid Polaritons In Graphene/hbn Multilayerssupporting

confidence: 78%

Near-field heat transfer between graphene/hBN multilayers

et al. 2017

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“…For d < 100 nm, the HTC of the single layer resembles that of the mHMM with SiC on top, and for d > 100 nm, it resembles the case of the mHMM with Ge on top. Therefore, the statement of [97] seems to be correct although in our plots the mHMM gives slightly larger results than the single-layer structure for d = 100 nm.…”

Section: K)mentioning

confidence: 79%

“…In addition, the result predicted by the EMT is plotted. even greater heat transfer" [97]. Therefore, we want to compare the sHTC and the HTC for our SiC/Ge mHMM structure with a structure consisting of a single 10-nm layer of SiC on a semi-infinite Ge substrate.…”

Section: K)mentioning

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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“…Recently, a number of works have demonstrated that near-field radiative heat transfer is enhanced by many orders of magnitude compared to the far-field limit for closely spaced objects with either natural 10,11 or engineered resonant surface modes [12][13][14][15][16] . There have also been efforts to couple these near-field modes into the far-field with the use of grating structures 17 , antennas 18 , and a thermal extraction lens 19,20 .…”

mentioning

confidence: 99%

Active thermal extraction of near-field thermal radiation

2016

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Radiative heat transport between materials supporting surface-phonon polaritons is greatly enhanced when the materials are placed at sub-wavelength separation as a result of the contribution of near-field surface modes. However, the enhancement is limited to small separations due to the evanescent decay of the surface waves. In this work, we propose and numerically demonstrate an active scheme to extract these modes to the far-field. Our approach exploits the monochromatic nature of near-field thermal radiation to drive a transition in a laser gain medium, which, when coupled with external optical pumping, allows the resonant surface mode to be emitted into the far-field. Our study demonstrates a new approach to manipulate thermal radiation that could find applications in thermal management.

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Effectiveness of Thin Films in Lieu of Hyperbolic Metamaterials in the Near Field

Cited by 93 publications

References 51 publications

Near-field heat transfer between graphene/hBN multilayers

Near-field heat transfer between graphene/hBN multilayers

Near-Field Heat Transfer between Multilayer Hyperbolic Metamaterials

Active thermal extraction of near-field thermal radiation

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