Anisotropic permittivity of ultra-thin crystalline Au films: Impacts on the plasmonic response of metasurfaces

Sawyer D. Campbell, Richard W Ziolkowski, Jiangrong Cao, Slimane Laref, Krishna Muralidharan, Pierre A Deymier

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Abstract

It has been determined by density functional theory (DFT) simulations that the extracted permittivities of ultra-thin crystalline gold (Au) films exhibit large anisotropies which are not predicted by classical models or previous experimental determinations of the dielectric function. The optical scattering characteristics of a periodic array of Au discs are simulated with the DFT extracted permittivity and contrasted against those obtained with several commonly used Au permittivity models. It is demonstrated that the DFT-based transmittance spectra for these plasmonic metasurfaces lead to significantly redshifted results when compared to those predicted by standard Drude and Johnson-Christy permittivity models.

Original languageEnglish (US)
Article number091106
JournalApplied Physics Letters
Volume103
Issue number9
DOIs
Publication statusPublished - Aug 26 2013

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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