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Updated: Jan 26, 2026
06:58
Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
7.9K
Plasmon Excitations in Mixed Metallic Nanoarrays
Kevin M Conley1,2, Neha Nayyar3, Tuomas P Rossi1,4
1Department of Applied Physics, COMP Centre of Excellence , Aalto University School of Science , P.O. Box 11100, FI-00076 Aalto , Finland.
ACS Nano
|April 12, 2019
Summary
Understanding surface plasmon properties in atomic chains is key. Researchers used time-dependent density functional theory to analyze noble and transition-metal chains, revealing tunable plasmonic responses for potential applications.
Area of Science:
- Surface Plasmonics
- Quantum Chemistry
- Materials Science
Background:
- Surface plasmon phenomena observed in macroscopic materials are also present in molecular systems.
- Distinguishing between collective and single-particle excitations in molecular plasmonics remains a challenge.
- Interactions between electron-hole pairs and collective electron excitations influence chemical physics in atomic arrays.
Purpose of the Study:
- To investigate the plasmonic properties of atomic arrays composed of noble (Au, Ag, Cu) and transition-metal (Pd, Pt) homonuclear chains.
- To elucidate the relationship between electronic structure, geometry, and plasmonic response in these atomic systems.
- To understand the origins of tunable plasmonic behavior for potential applications.
Main Methods:
- Utilized time-dependent density functional theory (TD-DFT) to model and analyze plasmonic properties.
- Calculated Kohn-Sham transition contributions to differentiate excitation types.
- Investigated the influence of sp-valence electron confinement, d-electron energy levels, and d-sp hybridization.
Main Results:
- Plasmon resonance position, peak splitting, and broadband absorption can be tuned by adjusting chain geometry and atomic composition.
- Hybrid arrays of mixed noble and transition metals may exhibit diminished plasmonic behavior.
- Kohn-Sham transition contributions confirmed the collective nature of the observed excitations.
Conclusions:
- The plasmonic response of atomic chains is governed by electron confinement, d-electron energy, and hybridization effects.
- Atomic chain arrays offer a pathway to engineer tailored plasmonic properties.
- Fundamental understanding of these phenomena is crucial for developing advanced plasmonic applications.
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