Analysis of near-field radiation transfer within nano-gaps using FDTD method

Didari, Azadeh; Mengüç, M. Pınar

doi:10.1016/j.jqsrt.2014.04.002

Cited by 47 publications

(21 citation statements)

References 19 publications

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“…Over the past few years, many theoretical approaches on NFRHT problems have been put forward by combining the Maxwell electromagnetic theory and the fluctuation-dissipation theorem [3]. These approaches, including the Green's function [3,[19][20][21], the scattering matrix [22][23][24][25][26], the finite difference time domain [27][28][29][30][31], the thermal discrete dipole approximation [32][33][34], the rigorous coupled wave analysis [35][36][37][38],the fluctuating surface [39][40][41] and volume [42][43][44] current etc., greatly enrich our understanding of NFRHT problems. Meanwhile, more and more experimental researches on NFRHT have been performed [45][46][47][48][49][50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

Radiative heat transfer in many-body systems: Coupled electric and magnetic dipole approach

2017

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The many-body radiative heat transfer theory [P. Ben-Abdallah, S.-A. Biehs, and K. Joulain, Phys.Rev. Lett. 107, 114301 (2011)] only considered the contribution from the electric dipole moment. For metal particles, however, the magnetic dipole moment due to eddy current plays an important role, which can further couple with the electric dipole moment to introduce crossed terms. In this work, we develop coupled electric and magnetic dipole (CEMD) approach for the radiative heat transfer in a collection of objects in mutual interaction. Due to the coupled electric and magnetic interactions, four terms, namely the electric-electric, the electric-magnetic, the magnetic-electric and the magnetic-magnetic terms, contribute to the radiative heat flux and the local energy density. The CEMD is applied to study the radiative heat transfer between various dimers of nanoparticles. It is found that each of the four terms can dominate the radiative heat transfer depending on the position and composition of particles.Moreover, near-field many-body interactions are studied by CEMD considering both dielectric and metallic nanoparticles. The near-field radiative heat flux and local energy density can be greatly increased when the particles are in coupled resonances. Surface plasmon polariton and surface phonon polariton can be coupled to enhance the radiative heat flux.

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Section: Introductionmentioning

confidence: 99%

Radiative heat transfer in many-body systems: Coupled electric and magnetic dipole approach

2017

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“…Eq. (12) 64,65 The Ricker wavelet, the second derivative of the Gaussian pulse, is used as the source as being recommended by Didari and Mengüҫ. 64 The reason is that it does not have any direct current component, which usually causes non-physical artifacts and thus leads to computational errors.…”

Section: B Green's Function Methodsmentioning

confidence: 99%

“…64 Eq. (3) can be used for predicting the radiative heat flux for arbitrary anisotropic materials with a modification that the integral range of x k becomes unlimited just like y k .…”

Section: Local Effective Medium Theorymentioning

confidence: 99%

Near-Field Thermal Radiation between Metasurfaces

2015

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Evanescent waves induced by thermal fluctuations can tunnel through nanoscale gap spacing, leading to super-Planckian thermal radiation. However, investigations of near-field thermal radiation of macroscopic objects have been limited to simple planar or effectively planar geometries until recently. Based on exact formulations including the scattering theory and Green’s function method, patterning thin films into 1D and 2D metasurfaces is found to increase the radiative heat flux by more than 1 order of magnitude in a certain range of thicknesses. The underlying mechanism of this counterintuitive phenomenon lies in the excitation of hyperbolic modes supporting high local density of states for broad frequency and k-space regimes. The radiative heat flux of a 2D metasurface increases monotonically with the thickness, while the heat flux of a 1D metasurface is not so sensitive to the thickness and is surprisingly higher than that of its 2D counterparts. The stark difference is attributed to the rapid-decay surface modes supported by a 1D metasurface in addition to the slow-decay hyperbolic modes.

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“…One way to obtain the Green functions is to use the finite-difference time-domain (FDTD) method based on a brute-force approach [86,87]. Basically, one electric dipole considering three different orientations is placed inside the source, and then the corresponding electric or magnetic dyadic Green function is obtained by dividing the Fourier transform of the timedependent electric field or magnetic field over that of the current induced by the dipole.…”

Section: Accurate Near-field Heat Flux Prediction For Periodic Metamamentioning

confidence: 99%

Near-Field Thermal Radiation: Recent Progress and Outlook

Liu

Wang

Zhang

2015

Nanoscale and Microscale Thermophysical Engineering

131

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Any materials at temperatures higher than absolute zero emit electromagnetic waves due to the thermal fluctuations of free charges or ions. When two or more bodies at different temperatures are brought sufficiently close to each other with vacuum gap spacing smaller than the characteristic thermal wavelength, near-field radiative heat flux can exceed the far-field blackbody limit, governed by the well-known Stefan-Boltzmann law, by orders of magnitude. This article reviews the recent progress on both theoretical and experimental studies of near-field thermal radiation with an emphasis on its potential applications. Recent theoretical developments are presented, such as near-field radiation of general anisotropic materials and 2D materials, application condition of effective medium theory, and exact numerical methods for dealing with arbitrary particles or periodic nanostructures. Recent experimental achievements are also discussed, focusing on tip-plane and plane-plane configurations with various materials. The wide applications of near-field radiation are summarized in terms of thermal imaging, energy harvesting, and contactless thermal management such as modulation, rectification, and amplification. An outlook is provided on the promise of near-field thermal radiation in energy harvesting, novel thermal sources, and sensing, as well as the development of related fields such as reducing Casimir stiction, minimizing noise current, and increasing spontaneous emission rate. Challenges are also discussed, such as developing exact and fast computational techniques for complex metamaterials, understanding near-field radiation at extreme gap spacing, overcoming weak mode coupling in thermophotovoltaic (TPV) systems, measuring large-area plane-plane configuration at small gap spacing, and realizing devices based on near-field radiation.

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Analysis of near-field radiation transfer within nano-gaps using FDTD method

Cited by 47 publications

References 19 publications

Radiative heat transfer in many-body systems: Coupled electric and magnetic dipole approach

Radiative heat transfer in many-body systems: Coupled electric and magnetic dipole approach

Near-Field Thermal Radiation between Metasurfaces

Near-Field Thermal Radiation: Recent Progress and Outlook

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