Plasmon excitations in chemically heterogeneous nanoarrays

Kevin Conley, Neha Nayyar, Tuomas Rossi, Mikael Kuisma, Volodymyr Turkowski, Martti Puska, Talat Rahman

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
73 Downloads (Pure)

Abstract

The capability of collective excitations, such as localized surface plasmon resonances, to produce a versatile spectrum of optical phenomena is governed by the interactions within the collective and single-particle responses in the finite system. In many practical instances, plasmonic metallic nanoparticles and arrays are either topologically or chemically heterogeneous, which affects both the constituent transitions and their interactions. Here, the formation of collective excitations in weakly Cu- and Pd-doped Au nanoarrays is described using time-dependent density functional theory. The additional impurity-induced modes in the optical response can be thought to result from intricate interactions between separated excitations or transitions. We investigate the heterogeneity at the impurity level, the symmetry aspects related to the impurity position, and the influence of the impurity position on the confinement phenomena. The chemically rich and symmetry-dependent quantum mechanical effects are analyzed with transition contribution maps demonstrating the possibility to develop nanostructures with more controlled collective properties.
Original languageEnglish
Article number235132
Pages (from-to)1-12
Number of pages12
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume101
Issue number23
DOIs
Publication statusPublished - 11 Jun 2020
MoE publication typeA1 Journal article-refereed

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