Plasmon Excitations in Mixed Metallic Nanoarrays

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • University of Central Florida
  • Chalmers University of Technology
  • Nanoscience Center

Abstract

Features of the surface plasmon from macroscopic materials emerge in molecular systems, but differentiating collective excitations from single-particle excitations in molecular systems remains elusive. The rich interactions between single-particle electron-hole and collective electron excitations produce phenomena related to the chemical physics aspects within the atomic array. We study the plasmonic properties of atomic arrays of noble (Au, Ag, and Cu) and transition-metal (Pd, Pt) homonuclear chains using time-dependent density functional theory and their Kohn-Sham transition contributions. The response to the electromagnetic radiation is related to both the geometry-dependent confinement of sp-valence electrons and the energy position of d-electrons in the different atomic species and the hybridization between d and sp electrons. It is possible to tune the position of the plasmon resonance, split it into several peaks, and eventually achieve broadband absorption of radiation. Arrays of mixed noble and transition-metal chains may have strongly attenuated plasmonic behavior. The collective nature of the excitations is ascertained using their Kohn-Sham transition contributions. To manipulate the plasmonic response and achieve the desired properties for broad applications, it is vital to understand the origins of these phenomena in atomic chains and their arrays.

Details

Original languageEnglish
Pages (from-to)5344-5355
Number of pages12
JournalACS Nano
Volume13
Issue number5
Early online date1 Jan 2019
Publication statusPublished - 28 May 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • collective excitation, molecular plasmonics, plasmonics, time-dependent density functional theory, transition contribution maps

ID: 33937957