衬底问题：用EELS探测衬底上球形粒子的耦合声子模式

IF 2 3区工程技术 Q2 MICROSCOPY

Ultramicroscopy Pub Date : 2025-09-01 DOI:10.1016/j.ultramic.2025.114229

Ka Yin Lee , Elliot K. Beutler , Tifany Q. Crisolo , David J. Masiello , Maureen J. Lagos

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引用次数: 0

摘要

利用振动电子能量损失谱（vib-EELS）与数值模拟相结合，研究了维持多极表面声子模式的球形粒子与底层薄膜之间声子耦合的物理机制。根据它们的介电成分，由于粒子和薄膜中的极化电荷之间的相互作用，在EEL光谱中出现了各种混合声子模式。镜像电荷效应和声子模式杂化分别是作用于介质型和金属型薄膜的活性机制。描述球膜耦合需要超越偶极-偶极相互作用的过程。

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Substrate matters: Coupled phonon modes of a spherical particle on a substrate probed with EELS

Using vibrational electron energy loss spectroscopy (vib-EELS) combined with numerical modeling, we investigate the physical mechanisms governing the phonon coupling between a spherical particle sustaining multipolar surface phonon modes and an underlying thin film. Depending upon their dielectric composition, a variety of hybrid phonon modes arise in the EEL spectrum due to the interaction between polarization charges in the particle and film. Mirror charge effects and phonon mode hybridization are the active mechanisms acting on dielectric and metallic-type films, respectively. Processes beyond dipole-dipole interactions are required to describe the sphere-film coupling.

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来源期刊

Ultramicroscopy 工程技术-显微镜技术

CiteScore

4.60

自引率

13.60%

发文量

117

审稿时长

5.3 months

期刊介绍： Ultramicroscopy is an established journal that provides a forum for the publication of original research papers, invited reviews and rapid communications. The scope of Ultramicroscopy is to describe advances in instrumentation, methods and theory related to all modes of microscopical imaging, diffraction and spectroscopy in the life and physical sciences.