Near-field thermal radiative transfer between two coated spheres

Czapla, Braden; Narayanaswamy, Arvind

doi:10.1103/physrevb.96.125404

Cited by 14 publications

(10 citation statements)

References 67 publications

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“…The effect provides the possibility to strengthen the SPPs near the interface of the substrate, in other words, as surface modes, the SPPs can spread further from the interface. Considering the lack of the channel between metal particles and the substrate, the core/shell configuration of nanoparticles can be utilized to realize the modifying of the particles [20,21]. Inspired by the above, we introduce a concept of a thermal repeater by modifying the particles with shell and embedding the substrate with multilayered graphene sheets, to form strongly coupled modes.…”

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confidence: 99%

Graphene-based thermal repeater

Ren

et al. 2019

Applied Physics Letters

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In this letter, we have demonstrated the possibility to efficiently relay the radiative heat flux between two nanoparticles by opening a smooth channel for heat transfer. By coating the nanoparticles with a silica shell and modifying the substrate with multilayered graphene sheets respectively, the localized phonon polaritons excited near the nanoparticles can couple with the multiple surface plasmon polaritons near the substrate to realize the heat relay in the long distance. The heat transfer can be enhanced by more than six orders of magnitude and the relay distance can be as high as 35 times in the far-field regime. The work may provide a way to realize the energy modulation or thermal communications especially in long distance. 2Since the prediction by Polder and Van Hove [1] that the heat exchange between two objects can be much higher than the blackbody limit at nanoscale separations, numerous nanoscale thermal devices [2-8] and unique phenomena [9, 10] are proposed. Thermal repeater is a device that can help the heat propagate further, acting as a relay. In other words, the key function of it is amplifying the radiative heat transfer (RHT) in long distance. When the two objects are separated at long distance, the RHT decreases dramatically as a result of the deterioration of the evanescent wave channel. Based on that, Dong et al. [11] proposed a method to delay the deterioration between two nanoparticles by placing a substrate near the two nanoparticles to form a channel for propagating surface waves. However, its performance dramatically degrades for metal nanoparticles, due to lack of coupled modes between the nanoparticles and the dielectric substrate. By coating monolayer graphene on the substrate, the performance of the long-distance energy-exchange has been improved [12]. However, the amplification is still limited for the reason that the graphene sheet can only couple with the substrate to form surface modes, but cannot greatly tailor the interplay between the nanoparticles and substrate. Moreover, the amplification is sorely confined near the interface of the substrate, due to the surface characteristics of graphene surface plasmon polaritons (SPPs).The lack of the connecting between the particles and the substrate, and the nature of SPPs both restrict the relay effect.Graphene exhibits intriguing electronic properties including the presence of strongly confined SPPs which can be excited to transport energy in photonic channels [13,14]. This has been exploited for a more efficient RHT between hybrid periodic structures [15] and between nanoparticles [16]. Recently, by using multilayer structures, the RHT between NPs has been shown to be further increased thanks to a resonant coupling between the substrate surface modes and the NPs resonances [17]. In addition, some unique phenomena are observed in multilayered graphene system [15,18,19], and one of the most important features is the multiple SPPs excited by the multilayered graphene. The effect provides the possibility to strengthen the SPPs near ...

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confidence: 99%

Graphene-based thermal repeater

Ren

et al. 2019

Applied Physics Letters

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“…R (M) l (ρ i ) and R (N) l (ρ i ) are the effective Mie reflection coefficients at the interface between region f and sphere i for M (1) lm (k f r i ) and N (1) lm (k f r i ) waves, respectively. See Czapla and Narayanaswamy [12] for the definitions of VSWs and Mie reflection coefficients, which are exactly identical to those used in this work. V X,Y,i, j l,ν,m are scattered field coefficients.…”

Section: Theorymentioning

confidence: 99%

“…To that end, a great deal of research has been directed towards determining explicit formulas for heat transfer in experimentally important thermal systems. Certain problems are best attacked using DGF and spectral density methods, such as NFRHT in plane-plane [9], sphere-sphere [6,[10][11][12], and sphere-plane [6,13] configurations, where the electromagnetic fields are easily described by vector wave eigenfunction expansions. Thermal systems which do not yield to those methods often require methods that involve surface or volume meshing, such as BEM and T-DDA.…”

Section: Introductionmentioning

confidence: 99%

Thermal radiative energy exchange between a closely-spaced linear chain of spheres and its environment

Czapla

Narayanaswamy

2019

Journal of Quantitative Spectroscopy and Radiative Transfer

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In this work, we present expressions for radiative heat transfer between pairs of spheres in a linear chain and between individual spheres and their environment. The expressions are valid for coated spheres of arbitrary size, spacing, and isotropic optical properties. The spheres may be small and closely-spaced, which violates the assumptions foundational to classical radiative transfer. We validate our results against existing formulations of radiative heat transfer, namely the thermal discrete dipole and boundary element methods. Our results have important implications for the modeling and interpretation of near-field radiative heat transfer experiments between spherical bodies.

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“…Narayanaswamy et al [19] studied the NFRHT between two spherical particles of arbitrary radius based on rigorous solution of the fluctuational electrodynamics theory with an quasi-analytical approach using vector spherical harmonics expansion. Czapla et al [20] extended the method developed by Narayanaswamy et al [19] to investigate NFRHT between two coated spheres with an arbitrary numbers of coatings. Messina et al [21][22][23] proposed a scattering operator method to investigate NFRHT between two particles of arbitrary shape.…”

Section: Introductionmentioning

confidence: 99%

Radiative heat transfer between metallic nanoparticle clusters in both near field and far field

et al. 2019

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Micro-nanoparticle systems have wide applications in thermal science and technology. In dense particulate system, the particle separation distance may be less than the characteristic thermal wavelength and near field effect will be significant and become a key factor to influence thermal radiation transfer in the system. In this study, radiative heat transfer (RHT) between two metallic nanoparticles clusters are explored using many-body radiative heat transfer theory implemented with the coupled electric and magnetic dipole (CEMD) approach, which effectively takes into account the contribution of magnetic polarization of metallic nanoparticles on heat exchange. As the focus, the effects of magnetic polarization and many-body interaction (MBI) on RHT were analyzed. The effects of fractal dimension and relative orientation of the clusters were also analyzed. Results show that the contribution of magnetically polarized eddy-current Joule dissipation dominates the RHT between Ag nanoparticle clusters. If only electric polarization (EP approach) is considered, the heat conductance will be underestimated as compared with the CEMD approach in both near field and far field regime. The effect of MBI on the RHT between Ag nanoparticle clusters is unobvious at room temperature, which is quite different from the SiC nanoparticle clusters. For the latter, MBI tends to suppress RHT significantly. The relative orientation has remarkable effect on radiative heat flux for clusters with lacy structure when the separation distance is in the near field. While for the separation distance in far field, both the relative orientation and the fractal dimension has a weak influence on radiative heat flux. This work will help the understanding of thermal transport in dense particulate system.Recently, there were some notable theoretical development to deal with NFRHT in

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Near-field thermal radiative transfer between two coated spheres

Cited by 14 publications

References 67 publications

Graphene-based thermal repeater

Graphene-based thermal repeater

Thermal radiative energy exchange between a closely-spaced linear chain of spheres and its environment

Radiative heat transfer between metallic nanoparticle clusters in both near field and far field

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