A Library of Late Transition Metal Alloy Dielectric Functions for Nanophotonic Applications

J. Magnus Rahm, Christopher Tiburski, Tuomas P. Rossi, Sara Nilsson, Christoph Langhammer, Paul Erhart, FERRY ANGGORO ARDY NUGROHO

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Accurate complex dielectric functions are critical to accelerate the development of rationally designed metal alloy systems for nanophotonic applications, and to thereby unlock the potential of alloying for tailoring nanostructure optical properties. To date, however, accurate alloy dielectric functions are widely lacking. Here, a time-dependent density-functional theory computational framework is employed to compute a comprehensive binary alloy dielectric function library for the late transition metals most commonly employed in plasmonics (Ag, Au, Cu, Pd, Pt). Excellent agreement is found between electrodynamic simulations based on these dielectric functions and selected alloy systems experimentally scrutinized in 10 at% composition intervals. Furthermore, it is demonstrated that the dielectric functions can vary in very non-linear fashion with composition, which paves the way for non-trivial optical response optimization by tailoring material composition. The presented dielectric function library is thus a key resource for the development of alloy nanomaterials for applications in nanophotonics, optical sensors, and photocatalysis.

Original languageEnglish
Article number2002122
JournalAdvanced Functional Materials
Volume30
Issue number35
DOIs
Publication statusPublished - 1 Aug 2020

Keywords

  • nanoalloys
  • nanofabrication
  • optical response
  • time-dependent density-functional theory

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