Previous studies of metal nanoparticle plasmonic properties yielded various nontrivial effects beyond the simple dipole response to light, such as the higher-order plasmon modes and dark and bright localized surface plasmons. Another intriguing plasmonic effect is the reduction of bulk plasmon (BP) resonances strength due to the Begrenzung effect, a phenomenon of the BP resonance modifications at the surface, which has been experimentally observed before and mathematically derived. In this work the LSP and BP resonances of tin nanoparticles were studied with electron energy loss spectroscopy (EELS) up to 45 eV. The effect of the Begrenzung effect on the plasmon resonances is here determined by reduced experimental EELS signals on S⁢i3⁢N4 encapsulated tin nanoparticles, which is explained by a detailed analysis of simulations. These simulations reveal an ubiquitous manifestation of the Begrenzung effect at multiple energies. The disentanglement of the multiple plasmon resonances in the Si⁢Nx covered tin nanoparticles give evidence of a rich plasmon occurrence which has been comprehensively mapped, that could lead to precise tailoring of plasmon properties up to extreme ultraviolet energies.

中文翻译：

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Si3N4 封装等离子体 Sn 纳米颗粒中的 Begrenzung 效应


以前对金属纳米粒子等离激元特性的研究产生了各种非平凡的影响，除了对光的简单偶极子响应之外，例如高阶等离激元模式和暗亮局部表面等离激元。另一个有趣的等离激元效应是由于 Begrenzung 效应导致的体等离激元 （BP） 共振强度降低，Begrenzung 效应是表面 BP 共振改变的一种现象，之前已经通过实验观察到并通过数学推导。在这项工作中，使用高达 45 eV 的电子能量损失光谱 （EELS） 研究了锡纳米颗粒的 LSP 和 BP 共振。Begrenzung 效应对等离子体共振的影响在这里是通过 Si3N4 封装的锡纳米颗粒上减少的实验 EELS 信号来确定的，这可以通过对模拟的详细分析来解释。这些模拟揭示了 Begrenzung 效应在多种能量下无处不在的表现。SiNx 覆盖的锡纳米颗粒中多个等离激元共振的解开提供了丰富的等离激元存在的证据，该存在已被全面绘制，这可能导致等离激元特性的精确定制，直至极端的紫外线能量。