Plasmon excitations in chemically heterogeneous nanoarrays

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-06-11
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Language
en
Pages
12
1-12
Series
Physical Review B (Condensed Matter and Materials Physics), Volume 101, issue 23
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.
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| openaire: EC/H2020/838996/EU//RealNanoPlasmon
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Citation
Conley, K, Nayyar, N, Rossi, T, Kuisma, M, Turkowski, V, Puska, M & Rahman, T 2020, ' Plasmon excitations in chemically heterogeneous nanoarrays ', Physical Review B (Condensed Matter and Materials Physics), vol. 101, no. 23, 235132, pp. 1-12 . https://doi.org/10.1103/PhysRevB.101.235132