Effects of spatial dispersion in near-field radiative heat transfer between two parallel metallic surfaces

Chapuis, Pierre-Olivier; Volz, Sébastian; Henkel, Carsten; Joulain, Karl; Greffet, Jean‐Jacques

doi:10.1103/physrevb.77.035431

Cited by 174 publications

(175 citation statements)

References 63 publications

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“…3(b). In the present work, we only experimentally demonstrated the near-field enhancement for gold surfaces, but the trend of near-field radiation varying with gap distances are quite similar for other metals such as silver and copper in terms of the theoretical work by Chapuis et al 21 Thus, the physical explanation and the magnitude of the measured near-field radiation between two gold surfaces given in this letter can be referred when other metals are considered.…”

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confidence: 66%

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Nanoscale thermal radiation between two gold surfaces

Shen

Mavrokefalos

Sambegoro

et al. 2012

Applied Physics Letters

109

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In this letter, we measured the nanoscale thermal radiation between a microsphere and a substrate which were both coated with thick gold films. Although gold is highly reflective for thermal radiation, the radiative heat transfer between two gold surfaces was demonstrated to be significantly enhanced at nanoscale gaps beyond the blackbody radiation limit due to the tunneling of non-resonant evanescent waves. The measured heat transfer coefficient between two gold surfaces agreed well with theoretical prediction. At a gap d ¼ 30 nm 6 5 nm, the heat transfer coefficient between two gold surfaces was observed to be as large as $400 W/m 2 ÁK, much greater than the blackbody radiation limit ($5 W/m 2 ÁK). When the gap size between two objects is smaller than the dominant thermal wavelength at the temperatures of the objects, photon tunneling can significantly enhance the radiative heat transfer beyond Planck's law of blackbody radiation. Cravalho et al. 1 theoretically investigated the enhancement of thermal radiation between two dielectrics at small separations. Polder and van Hove 2 established a theoretical approach to calculate the near-field radiation between metallic surfaces based on fluctuational electrodynamics theory developed by Rytov 3 that became the foundation for future investigations. This theoretical framework has been extensively used subsequently by many groups to study the near-field radiation between the surfaces of dielectrics, 4,5 semiconductors, 6 and thin films. 7 A number of experiments were also reported to measure the near-field thermal radiation between two parallel plates or between a small tip and a flat substrate. Domoto et al. 8 and Kuteladze et al. 9 investigated the radiative transfer between two parallel metallic surfaces at cryogenic temperatures. Hargreaves 10 carried out the experiments between two metallic films of chromium at room temperature and showed the enhanced heat transfer around 1 lm. Xu et al. 11 measured the radiative transfer between a deformed indium surface and a small gold surface but did not conclusively confirm near-field effects. Hu et al. 12 measured the radiative heat transfer between two glass plates and observed the radiative heat transfer exceeding the predictions of the Planck law by 35% when the two plates were separated by $1 lm. Very recently, Ottens et al. 13 measured the radiative heat transfer between two macroscopic planar sapphire surfaces with a separation down to several micrometers around room temperature. Kittel et al. 14 measured the radiative heat transfer between a scanning probe microscope (STM) tip and a flat substrate. The saturation of heat flux was observed at extremely small distances ($10 nm). They attributed this phenomenon to spatial dispersion effects and the contribution of the infrared magnetic dipole component.We have developed over the last few years a technique to measure the near-field radiation between a microsphere and a substrate at nanoscale gaps, using a bi-material atomic force microscope (AFM) cantilever. 15,16 The n...

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confidence: 66%

“…For metals, Chapuis et al 21 calculated the near-field radiation between two parallel metallic surfaces. They showed that near-field radiative heat flux dramatically increases when reducing gap distances, and s-polarized field dominates the heat transfer between metallic surfaces rather than p-polarized field for dielectrics.…”

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confidence: 99%

Nanoscale thermal radiation between two gold surfaces

Shen

Mavrokefalos

Sambegoro

et al. 2012

Applied Physics Letters

109

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“…Let us remark that in the formalism detailed above, we make use of a local approximation, in which the dielectric function is assumed to depend only on frequency. However, non-local contributions due to the momentum dependence of the dielectric function have been shown to be negligible for gaps larger than 1Å [55], as the ones studied in this work.…”

Section: Photon Transportmentioning

confidence: 87%

Thermal conductance and thermoelectric figure of merit of C60 -based single-molecule junctions: Electrons, phonons, and photons

et al. 2017

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Motivated by recent experiments, we present here an ab initio study of the impact of the phonon transport on the thermal conductance and thermoelectric figure of merit of C60-based single-molecule junctions. To be precise, we combine density functional theory with nonequilibrium Green's function techniques to compute these two quantities in junctions with either a C60 monomer or a C60 dimer connected to gold electrodes, taking into account the contributions of both electrons and phonons. Our results show that for C60 monomer junctions phonon transport plays a minor role in the thermal conductance and, in turn, in the figure of merit, which can reach values on the order of 0.1, depending on the contact geometry. In C60 dimer junctions, phonons are transported less efficiently, but they completely dominate the thermal conductance and reduce the figure of merit as compared to monomer junctions. Thus, claims that by stacking C60 molecules one could achieve high thermoelectric performance, which have been made without considering the phonon contribution, are not justified. Moreover, we analyze the relevance of near-field thermal radiation for the figure of merit of these junctions within the framework of fluctuational electrodynamics. We conclude that photon tunneling can be another detrimental factor for the thermoelectric performance, which has been overlooked so far in the field of molecular electronics. Our study illustrates the crucial roles that phonon transport and photon tunneling can play, when critically assessing the performance of molecular junctions as potential nanoscale thermoelectric devices.

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“…Several groups [5,[9][10][11] have shown that when the gap distance, d between bodies becomes very small, the near-field heat transfer varies as d −2 . By using nonlocal dielectric function it has been shown that, the d −2 dependence would disappear for d < 0.1 nanometer (nm) [12], [13] but generally speaking, the nonlocal effects has little influence on the predicted heat flux for d > 0.1 nm [12]. Basu et al * simchi@alumni.iust.ac.ir have considered two semi-infinite plates separated by a vacuum gap of finite width, especially for 0.1 < d < 100 nm, and studied the dependency of maximum heat flux to the dielectric function and vacuum gap width [14].…”

Section: Introductionmentioning

confidence: 99%

Graphene-based three-body amplification of photon heat tunneling

Simchi

2017

Journal of Applied Physics

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We consider a three slabs configuration including two non-doped single layer graphene on insulating silicon dioxide (G/SiO2) substrates and one non-doped suspended single layer graphene (SG). The suspended layer is placed between two G/SiO2 layers. Without SG layer, the heat flux has maximum at Plasmon frequency supported by the G/SiO2 slabs. In three slabs configuration, the photon heat tunneling is amplified between two G/SiO2 layers significantly, only for specific range of vacuum gap between SG layer and G/SiO2 layers and Plasmon frequency, due to the coupling of modes between each G/SiO2 layer and SG layer. Since, the SG layer is a single atomic layer, the photon heat tunneling assisted by this configuration does not depend on the thickness of middle layer and in consequence, it can enable novel applications for nanoscale thermal management.

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Effects of spatial dispersion in near-field radiative heat transfer between two parallel metallic surfaces

Cited by 174 publications

References 63 publications

Nanoscale thermal radiation between two gold surfaces

Nanoscale thermal radiation between two gold surfaces

Thermal conductance and thermoelectric figure of merit of C60 -based single-molecule junctions: Electrons, phonons, and photons

Graphene-based three-body amplification of photon heat tunneling

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