Enhanced near-field radiative heat transfer between corrugated metal plates: Role of spoof surface plasmon polaritons

J. Dai, S. A. Dyakov, M. Yan

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46 Citations (Scopus)

Abstract

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. Martín-Moreno, and F. J. Garcia-Vidal, Science 305, 847 (2004)SCIEAS0036-807510.1126/science.1098999]. 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.

Original languageEnglish
Article number035419
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number3
DOIs
Publication statusPublished - 17 Jul 2015
Externally publishedYes

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