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Radiative heat transfer between two dielectric-filled metal gratings
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0002-0111-9009
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0002-3368-9786
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 93, no 15, 155403Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Nanoscale surface corrugation is known to be able to drastically enhance radiative heat transfer between two metal plates. Here we numerically calculate the radiative heat transfer between two dielectric-filled metal gratings at dissimilar temperatures based on a scattering approach. It is demonstrated that, compared to unfilled metal gratings, the heat flux for a fixed geometry can be further enhanced, by up to 650% for the geometry separated by a vacuum gap of g = 1 mu m and temperature values concerned in our study. The enhancement in radiative heat transfer is found to depend on refractive index of the filling dielectric, the specific grating temperatures, and naturally the gap size between the two gratings. The enhancement can be understood through examining the transmission factor spectra, especially the spectral locations of the spoof surface plasmon polariton modes. Of more practical importance, it's shown that the radiative heat flux can exceed that between two planar SiC plates with same thickness, separation, and temperature settings over a wide temperature range. This reaffirms that one can harness rich electromagnetic modal properties in nanostructured materials for efficient thermal management at nanoscale.

Place, publisher, year, edition, pages
2016. Vol. 93, no 15, 155403
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-185983DOI: 10.1103/PhysRevB.93.155403ISI: 000373569000003Scopus ID: 2-s2.0-84963747850OAI: oai:DiVA.org:kth-185983DiVA: diva2:926548
Note

QC 20160509

Available from: 2016-05-09 Created: 2016-04-29 Last updated: 2016-11-07Bibliographically approved
In thesis
1. Near-Field Radiative Heat Transfer between Plasmonic Nanostructures
Open this publication in new window or tab >>Near-Field Radiative Heat Transfer between Plasmonic Nanostructures
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Radiative heat transfer (RHT) due to coupled electromagnetic near field scan significantly exceed that dictated by Planck’s law. Understanding such phenomenon is not only of fundamental scientific interest, but also relevant to a broad range of applications especially connected to nanotechnologies.This dissertation elaborates, through a scattering approach based on the rigorous coupled wave analysis method, how plasmonic nanostructures can tame the near-field RHT between two bodies. The transmission-factor spectra are corroborated by photonic band diagrams computed using a finite element method. The main work begins by showing that the phenomenon of spoofsurface plasmon polariton (SSPP) guided on grooved metal surfaces can play a similar role as surface phonon polariton in enhancing the RHT between two closely placed plates. Since dispersions of SSPPs especially their resonance frequencies can be engineered through geometrical surface profiling,one has great freedom in tailoring spectral properties of near-field RHT. Further enhancement of RHT can be achieved through techniques like filling of dielectrics in grooves or deploying supercells. A thorough study of RHT betweentwo 1D or 2D grooved metal plates confirms super-Planckian RHT at near-field limit, with 2D grooved metal plates exhibiting a superior frequency selectivity. We also present RHT with a more exotic type of plasmonic nanostructures consisting of profile-patterned hyperbolic metamaterial arrays, and show that with such plasmonic nanostructures one can achieve an ultrabroadband super-Planckian RHT.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 84 p.
Series
TRITA-ICT, 2016:31
National Category
Condensed Matter Physics Atom and Molecular Physics and Optics Nano Technology
Research subject
Physics; Energy Technology
Identifiers
urn:nbn:se:kth:diva-195653 (URN)978-91-7729-175-6 (ISBN)
Public defence
2016-12-07, Sal C, Kistagången 16, Kista, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2011-4526
Note

QC 20161111

Available from: 2016-11-11 Created: 2016-11-07 Last updated: 2016-11-11Bibliographically approved

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