Enhanced near-field radiative heat transfer between corrugated metal plates: Role of spoof surface plasmon polaritons
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 3, 035419Article in journal (Refereed) Published
We demonstrate with the finite-difference time-domain method that radiative heat transfer between two parallel gold plates can be significantly enhanced by engraving periodic grooves with a subwavelength width on the plate surfaces. The enhancement increases with a decrease in the separation distance at near-field regime and it can be further efficiently improved by having a supercell with multiple grooves with different depths. We attribute this near-field enhancement to coupling of thermally excited spoof surface plasmon polaritons, a type of artificial surface wave inherent to structured metal surfaces [J. B. Pendry, L. Martin-Moreno, and F. J. Garcia-Vidal, Science 305, 847 (2004)]. The frequency-dependent contribution to the heat transfer, or transmission-factor spectrum, is confirmed by calculating the dispersion relation of guided modes by the two parallel corrugated plates through a finite-element method. Especially, the photonic density of states derived from the dispersion relation is found to have excellent agreement to the transmission-factor spectrum.
Place, publisher, year, edition, pages
2015. Vol. 92, no 3, 035419
IdentifiersURN: urn:nbn:se:kth:diva-171887DOI: 10.1103/PhysRevB.92.035419ISI: 000358031300002OAI: oai:DiVA.org:kth-171887DiVA: diva2:846044
FunderSwedish Research Council, 621-2011-4526
QC 201508142015-08-142015-08-102015-08-14Bibliographically approved