Near-field thermal emission between corrugated surfaces separated by nano-gaps

Didari, Azadeh; Mengüç, M. Pınar

doi:10.1016/j.jqsrt.2015.02.016

Cited by 32 publications

(8 citation statements)

References 25 publications

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“…In [5] we have presented that the results found for the near-field thermal emission calculations via FDTD method for perfectly flat, parallel, thin SiC films supporting surface phonon polaritons and separated by a nano-gap, show a good agreement with analytical results presented in [4]. We then extended the problem by introducing corrugated surfaces and studied the behavior of near-field thermal emission through the study of periodicity, shape and size of nanoparticles sitting on the surface of the emitting layer in the aforementioned configuration [6]. Our results showed an increase in the magnitude of LDOS with an increase in the periodicity of the nano-gratings, when the distance between the gratings is much smaller than the wavelength of interest.…”

Section: Introductionsupporting

confidence: 67%

“…Our results showed an increase in the magnitude of LDOS with an increase in the periodicity of the nano-gratings, when the distance between the gratings is much smaller than the wavelength of interest. In another recent study, in which we evaluated the impact of arbitrary shape nano-gratings, it was observed that rectangles show the greatest impact on enhancement of LDOS value when compared against ellipses and triangles of the same sizes [7].…”

Section: Introductionmentioning

confidence: 98%

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Near to Far-Field Thermal Emission by Nanoparticles on a Substrate: Evaluation of Effective Medium Theory

Didari

Mengüç

2014

Light, Energy and the Environment

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Near-field thermal radiation with its variety of applications in different fields such as energy harvesting and radiative cooling could be crucial in the development of new generation of devices. In this work, we study the near to far-field thermal emission of a thin SiC film supporting surface phonon polaritons. The same thin film is also considered when nano-spheres are placed upon its surface and we compare the results against those obtained using the effective medium theory (EMT). We observed that there is significant enhancement of emission when nanoparticles are placed on the surface with certain periodicities, particularly at the far field, which shows potential use of these structures for radiative cooling applications. We conclude that accuracy of the results is questionable when EMT is used for the case of surfaces with nanostructures.

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Section: Introductionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 98%

Near to Far-Field Thermal Emission by Nanoparticles on a Substrate: Evaluation of Effective Medium Theory

Didari

Mengüç

2014

Light, Energy and the Environment

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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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“…Therefore, highly efficient numerical methods are required to simulate the thermal radiation of arbitrary geometries. Some representative numerical methods for directly calculating thermal radiation are listed as follows: the scattering matrix method based on the rigorous coupled-wave analysis (RCWA) for periodic structures where the geometries are decomposed into multi-layers 36,37 ; the Fluctuating Surface Current (FSC) method using boundary element method where the geometric boundaries are decomposed into surface elements 38,39 ; the Monte-Carlo method by sampling thermally induced random currents 40 ; the Thermal Discrete Dipole Approximation (T-DDA) method 41,42 ; the NF-RT-FDTD method 43 which is a direct and non-stochastic algorithm accounting for the statistical nature of thermal radiation; and the Fluctuating Volume Current (FVC) method 44 . The WCE method that we used in this paper is developed to calculate thermal radiation of arbitrary geometries by expanding thermally induced random currents onto deterministic orthonormal current modes 29,45,46 .…”

Section: Introductionmentioning

confidence: 99%

Tunable narrow-band near-field thermal emitters based on resonant metamaterials

Liu

2017

Phys. Rev. B

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In the near field, Planck's law of blackbody radiation breaks down, and radiative heat transfer can be enhanced by orders of magnitude when surface polaritons are supported by interacting materials. However, such thermal radiation enhancement is strongly material-dependent thus difficult to control. Here, we propose a new metamaterial-based structure consisted of patterned doped silicon nanorods which exhibits tunable narrow-band thermal emission. Direct numerical simulation based on the Wiener-chaos Expansion(WCE) method is performed to accurately investigate the heat transfer mechanism of metamaterials in the near-field. Fundamental principle of the WCE method is elucidated, and an algorithm for symmetric and periodic structures is discussed. Implementation of the WCE method with the finite-difference-timedomain method using the discrete dipole approximation is also addressed in this paper.

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Near-field thermal emission between corrugated surfaces separated by nano-gaps

Cited by 32 publications

References 25 publications

Near to Far-Field Thermal Emission by Nanoparticles on a Substrate: Evaluation of Effective Medium Theory

Near to Far-Field Thermal Emission by Nanoparticles on a Substrate: Evaluation of Effective Medium Theory

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

Tunable narrow-band near-field thermal emitters based on resonant metamaterials

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