Unraveling the Origin of Localized Surface Plasmon Resonance in Noble Metals and Its Integration with Surface Plasmon Polaritons
Year: 2025
Type: article
Abstract: We investigated two types of surface plasmons―localized surface plasmon resonance (LSPR) and surface plasmon polaritons (SPPs)―and their interplay using size-selected Ag, Au, and Cu nanoclusters (NCs) and ultrafast spectroscopy. Atomically precise NCs were prepared by magnetron sputtering with mass selection and deposited on C60-modified substrates. Two-photon photoemission spectroscopy (2PPE) revealed threshold sizes for plasmon emergence (≥9 atoms for Ag, ≥21 for Au) and clarified the influence of d-band structures. Dual-color 2P-PEEM visualized SPP propagation at metal–organic interfaces, showing that LSPR enhancement and molecular modifications can tune SPP characteristics, even at buried interfaces using NC sensitizers. These results provide key insights into size- and structure-dependent plasmonic behavior and inform the design of advanced photoelectronic and nanophotonic devices.
Source: Vacuum and Surface Science
DOI: 10.1380/vss.68.605
Authors: Miwa TOKITA, Tomoya INOUE, Masahiro SHIBUTA, Atsushi NAKAJIMA
Institutions: Keio University, Osaka Metropolitan University
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7104515419