Optical Property-Composition Correlation in Noble Metal Alloy Nanoparticles Studied with EELS
Journal article, 2019

Noble metals are currently the most common building blocks in plasmonics and thus define the available range of optical properties. Their alloying provides a viable strategy to engineer new materials with a tunable range of optical responses. Despite this attractive prospect, the link between composition and optical properties of many noble metal alloys is still not well understood. Here, electron energy-loss spectroscopy is employed to systematically study AuAg and AuPd nanoparticles of varying compositions. The localized surface plasmons, the bulk plasmons, and the permittivity functions of these two sets of alloys are investigated as functions of their composition. In the case of the more widely studied AuAg alloy system, good agreement is found with previous experimental and theoretical studies. The results on the less scrutinized AuPd system provide highly valuable experimental data that complements other experimental investigations and supports the development of theoretical models.



optical properties

localized surface plasmons

permittivity function


electron energy-loss spectroscopy


S. Kadkhodazadeh

Technical University of Denmark (DTU)

Ferry Nugroho

Chalmers, Physics, Chemical Physics

Christoph Langhammer

Chalmers, Physics, Chemical Physics

Marco Beleggia

Technical University of Denmark (DTU)

Jakob B. Wagner

Technical University of Denmark (DTU)

ACS Photonics

2330-4022 (eISSN)

Vol. 6 3 779-786

Wallenberg Academy Fellow KAW 2016.0210

Knut and Alice Wallenberg Foundation, 2017-07-01 -- 2022-06-30.

Subject Categories

Atom and Molecular Physics and Optics

Other Materials Engineering

Condensed Matter Physics



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5/7/2019 1