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Size-dependent permittivity and intrinsic optical anisotropy of nanometric gold thin films: A density functional theory study
Authors
A Asaduzzaman
J Cao
+6 more
P Deymier
S Laref
M Miyawaki
K Muralidharan
K Runge
RW Ziolkowski
Publication date
20 May 2013
Publisher
'The Optical Society'
Doi
Cite
Abstract
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. © 2013 Optical Society of America
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Last time updated on 18/10/2019