AuAl<inf>2</inf>and PtAl<inf>2</inf>as potential plasmonic materials

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Journal Article
Journal of Alloys and Compounds, 2013, 577 pp. 581 - 586
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The dielectric functions of PtAl2, AuAl2and hypothetical intermediate alloys of the two in the form of Aux- Pt1-xAl2were calculated from first principles using density functional theory (DFT) and the random phase approximation (RPA). From these, the reflectivity, electron energy-loss spectra (EELS) and small sphere extinction spectra are predicted. The experimental reflectivity and EELS were measured for PtAl2and showed good agreement with the theoretical spectra. The yellow color of PtAl2is associated with a bulk plasmon at 3 eV. We predict that the optical properties of hypothetical intermediate alloys would show a smooth evolution with composition. The details of this change can be understood by examination of the underlying density of states (DOS). The predicted small sphere extinction spectra and quality factors show a strong surface plasmon resonance for these materials, with PtAl2having the optimum performance. The results indicate that these materials are good candidates for applications in plasmonics. © 2013 Elsevier B.V. All rights reserved.
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