电子约束、量子尺寸效应和薄膜形态对银和金薄膜中等离子体模式色散和阻尼的影响

IF 8.7 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Antonio Politano , Gennaro Chiarello
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引用次数: 0

摘要

等离子体激元是金属样品中受外电场激发的电荷波动的集体纵向模式。表面等离子体(SPs)是沿导体表面传播的波。SPs应用于磁光数据存储、光学、显微镜和催化等领域。银和金中SPs的研究是相关的,因为这些材料在等离子体中被广泛使用。计算贵金属等离子体模式的理论方法由于费米能级附近局域电子的存在而变得复杂。然而,最近基于线性响应理论和时变局部密度近似的计算充分地描述了贵金属中SPs的色散和阻尼。此外,在薄膜中,电子响应受到电子量子约束的影响。约束电子通过引入具有潜在应用价值的新特性来改变薄膜/衬底界面的动态筛选过程。Ag和Au薄膜中量子阱态的存在影响了SP频率的色散关系和SP的阻尼过程。最近的计算表明,在表现量子阱态的Ag薄膜中出现了声表面等离子体(ASP)。ASP的分散斜率随膜厚的增加而减小。高分辨率电子能量损失谱(HREELS)是研究集体电子激发的主要实验技术,在能量和动量域都有足够的分辨率来研究表面模式。本文综述了近年来在单晶基底上沉积银和金薄膜的集体电子激发的研究进展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The influence of electron confinement, quantum size effects, and film morphology on the dispersion and the damping of plasmonic modes in Ag and Au thin films

Plasmons are collective longitudinal modes of charge fluctuation in metal samples excited by an external electric field. Surface plasmons (SPs) are waves that propagate along the surface of a conductor. SPs find applications in magneto-optic data storage, optics, microscopy, and catalysis.

The investigation of SPs in silver and gold is relevant as these materials are extensively used in plasmonics. The theoretical approach for calculating plasmon modes in noble metals is complicated by the existence of localized d electrons near the Fermi level. Nevertheless, recent calculations based on linear response theory and time-dependent local density approximation adequately describe the dispersion and damping of SPs in noble metals.

Furthermore, in thin films the electronic response is influenced by electron quantum confinement. Confined electrons modify the dynamical screening processes at the film/substrate interface by introducing novel properties with potential applications. The presence of quantum well states in the Ag and Au overlayer affects both the dispersion relation of SP frequency and the damping processes of the SP.

Recent calculations indicate the emergence of acoustic surface plasmons (ASP) in Ag thin films exhibiting quantum well states. The slope of the dispersion of ASP decreases with film thickness.

High-resolution electron energy loss spectroscopy (HREELS) is the main experimental technique for investigating collective electronic excitations, with adequate resolution in both the energy and momentum domains to investigate surface modes.

Herein we review on recent progress of research on collective electronic excitations in Ag and Au films deposited on single-crystal substrates.

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来源期刊
Progress in Surface Science
Progress in Surface Science 工程技术-物理:凝聚态物理
CiteScore
11.30
自引率
0.00%
发文量
10
审稿时长
3 months
期刊介绍: Progress in Surface Science publishes progress reports and review articles by invited authors of international stature. The papers are aimed at surface scientists and cover various aspects of surface science. Papers in the new section Progress Highlights, are more concise and general at the same time, and are aimed at all scientists. Because of the transdisciplinary nature of surface science, topics are chosen for their timeliness from across the wide spectrum of scientific and engineering subjects. The journal strives to promote the exchange of ideas between surface scientists in the various areas. Authors are encouraged to write articles that are of relevance and interest to both established surface scientists and newcomers in the field.
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