A1 Journal article (refereed)
Plasmon excitations in chemically heterogeneous nanoarrays (2020)


Conley, Kevin; Nayyar, Neha; Rossi, Tuomas P.; Kuisma, Mikael; Turkowski, Volodymyr; Puska, Martti J.; Rahman, Talat S. (2020). Plasmon excitations in chemically heterogeneous nanoarrays. Physical Review B, 101 (23), 235132. DOI: 10.1103/PhysRevB.101.235132


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Publication details

All authors or editors: Conley, Kevin; Nayyar, Neha; Rossi, Tuomas P.; Kuisma, Mikael; Turkowski, Volodymyr; Puska, Martti J.; Rahman, Talat S.

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2020

Volume: 101

Issue number: 23

Article number: 235132

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: http://doi.org/10.1103/PhysRevB.101.235132

Open Access: Publication channel is not openly available

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/70031


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.


Keywords: nanostructures; nanoparticles; quasiparticles; plasmons; density functional theory


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Ministry reporting: Yes

Reporting Year: 2020


Last updated on 2020-18-08 at 13:22