Modeling near-field radiative heat transfer from sharp objects using a general three-dimensional numerical scattering technique

McCauley, Alexander P.; Reid, M. T. Homer; Krüger, Matthias; Johnson, Steven G.

doi:10.1103/physrevb.85.165104

Cited by 55 publications

(33 citation statements)

References 21 publications

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“…Calculations have primarily been for dipolar [5,10,59] or highly symmetric bodies [8-14, 18-23, 25-31, 69-71], with computational study of more complex geometries possible only recently [35,62,63,[72][73][74]. We have show that, guided by the physical principles presented here, a targeted search through the mostly uncharted near-field design space offers the prospect of orders-of-magnitude enhancements in radiative energy transfer.…”

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confidence: 99%

Shape-Independent Limits to Near-Field Radiative Heat Transfer

2015

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We derive shape-independent limits to the spectral radiative heat-transfer rate between two closely spaced bodies, generalizing the concept of a black body to the case of near-field energy transfer. Through conservation of energy and reciprocity, we show that each body of susceptibility χ can emit and absorb radiation at enhanced rates bounded by |χ| 2 / Im χ, optimally mediated by near-field photon transfer proportional to 1/d 2 across a separation distance d. Dipole-dipole and dipole-plate structures approach restricted versions of the limit, but common large-area structures do not exhibit the material enhancement factor and thus fall short of the general limit. By contrast, we find that particle arrays interacting in an idealized Born approximation (i.e., neglecting multiple scattering) exhibit both enhancement factors, suggesting the possibility of orders-of-magnitude improvement beyond previous designs and the potential for radiative heat transfer to be comparable to conductive heat transfer through air at room temperature, and significantly greater at higher temperatures.

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confidence: 99%

Shape-Independent Limits to Near-Field Radiative Heat Transfer

2015

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“…They also asymptotically computed a nanorod-to-plate geometric configuration, where a nanorod lies in parallel to the plane, by increasing the radius of a nanorod while the other nanorod radius is held constant until the corresponding radiative heat transfer rate converges. A cylinder-to-plate configuration where the cylinder axis is perpendicular to the plate was investigated and compared with a sphere-to-plate and a sharp tip-to-plate cases (McCauley, 2012). The near-field cylinder-to-plate heat transfer rate has a ∼d −2 gap dependence while the sphere-to-plate case shows a d −1 dependence, consistently with the proximity approximation.…”

Section: Near-field Radiative Heat Transfer In Cylindrical Objectsmentioning

confidence: 63%

Fundamentals and Applications of Near-Field Radiative Energy Transfer

Park¹,

Zhang²

2013

Frontiers in Heat and Mass Transfer

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This article reviews the recent advances in near-field radiative energy transfer, particularly in its fundamentals and applications. When the geometrical features of radiating objects or their separating distances fall into the sub-wavelength range, near-field phenomena such as photon tunneling and surface polaritons begin to play a key role in energy transfer. The resulting heat transfer rate can greatly exceed the blackbody radiation limit by several orders magnitude. This astonishing feature cannot be conveyed by the conventional theory of thermal radiation, generating strong demands in fundamental research that can address thermal radiation in the near field. Important breakthroughs of near-field thermal radiation are presented here, covering from the essential physics that will help better understand the basics of near-field thermal radiation to the most recent theoretical as well as experimental findings that will further promote the fundamental understanding. Applications of near-field thermal radiation in various fields are also discussed, including the radiative property manipulation, near-field thermophotovoltaics, nanoinstrumentation and nanomanufacturing, and thermal rectification.

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“…This can be proposed as an alternative method for calculation of thermal conductance between e.g. a sphere and a slab that has been done in several methods in several references [15][16][17] .…”

Section: Numerical Resultsmentioning

confidence: 99%

Near-field radiative thermal transfer between a nanostructured periodic material and a planar substrate

2015

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This paper provides a method based on rigorous coupled wave analysis for the calculation of the radiative thermal conductance between a layer that is patterned with arbitrary, periodically repeating features and a planar substrate. This method is applied to study the transfer from an array of beams with a rectangular cross section. The impact of the structure size and spacing on the thermal conductance are investigated. These calculations are compared to an effective medium theory, which becomes increasingly accurate as the structure sizes fall well below the relevant resonance wavelengths of materials and structures. Moreover, comparisons are made with a modified proximity approximation and the far-field approximation, which become valid for small and large spacings, respectively. Results show that new levels of control over the magnitude and spectral contributions to thermal conductance can be achieved with corrugated structures relative to planar ones. Specifically, we show for SiC arrays with rectangular cross sections and with the same filling fraction that the use of a smaller periodicity leads to a lowered far-field thermal transfer and an increased near-field thermal transfer. INTRODUCTION:

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Modeling near-field radiative heat transfer from sharp objects using a general three-dimensional numerical scattering technique

Cited by 55 publications

References 21 publications

Shape-Independent Limits to Near-Field Radiative Heat Transfer

Shape-Independent Limits to Near-Field Radiative Heat Transfer

Fundamentals and Applications of Near-Field Radiative Energy Transfer

Near-field radiative thermal transfer between a nanostructured periodic material and a planar substrate

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