Size-dependent permittivity and intrinsic optical anisotropy of nanometric gold thin films: A density functional theory study

Slimane Laref, Jiangrong Cao, Abu Asaduzzaman, Keith Runge, Pierre Deymier, Richard W. Ziolkowski, Mamoru Miyawaki, Krishna Muralidharan

Research output: Contribution to journalArticle

35 Scopus citations


Physical properties of materials are known to be different from the bulk at the nanometer scale. In this context, the dependence of optical properties of nanometric gold thin films with respect to film thickness is studied using density functional theory (DFT). We find that the in-plane plasma frequency of the gold thin film decreases with decreasing thickness and that the optical permittivity tensor is highly anisotropic as well as thickness dependent. Quantitative knowledge of planar metal film permittivity's thickness dependence can improve the accuracy and reliability of the designs of plasmonic devices and electromagnetic metamaterials. The strong anisotropy observed may become an alternative method of realizing indefinite media.

Original languageEnglish (US)
Pages (from-to)11827-11838
Number of pages12
JournalOptics Express
Issue number10
StatePublished - May 20 2013


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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