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arXiv 2108.06141physics.optics
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金属薄膜表面等离子体激元-极化激元的能量和动量

Energy and momentum of the surface plasmon-polariton supported by a thin metal film

A. Y. Bekshaev, O. A. Angelsky

摘要:

我们研究了在对称的3层“绝缘体-金属-绝缘体”结构中激发的表面等离子体激元(SPP)的能量和动量,已知该结构支持负群速度的对称(S)模以及只有正能量流的反对称(AS)模。电场和磁场矢量计算通过唯象和微观的方法,后者涉及的流体动力学模型占金属中的电子气的量子统计效应。得到了介质和金属薄膜中能量和动量分量的显式表达式,并对整个SPP的能量和动量贡献随波数的变化进行了数值分析.各种能量和动量成分根据它们的起源(“场”或“物质”)和物理性质(轨道(正则)和自旋(贝琳凡特)动量贡献)进行分类。系统地比较了S模式和AS模式的图像特征。这些结果对SPP诱导的薄膜效应,特别是薄膜等离子体系统中的电荷和自旋动力学的研究和应用具有重要意义。

英文摘要:

We study the energy and momentum of the surface plasmon-polariton (SPP) excited in a symmetric 3-layer "insulator-metal-insulator" structure, which is known to support the symmetric (S) mode with the negative group velocity as well as the antisymmetric (AS) mode with only positive energy flow. The electric and magnetic field vectors are calculated via both the phenomenological and the microscopic approach; the latter involves the hydrodynamic model accounting for the quantum statistical effects for the electron gas in metal. Explicit representation for the energy and momentum constituents in the dielectric and in the metal film are obtained, and the wavenumber dependences of the energy and momentum contributions for the whole SPP are analyzed numerically. The various energy and momentum constituents are classified with respect to their origin: "field" or "material", and the physical nature: orbital (canonical) and spin (Belinfante) momentum contributions. The pictures characteristic for the S and AS modes are systematically compared. The results can be useful for the studies and applications of the SPP-induced thin-film effects, in particular, for the charge and spin dynamics in thin-film plasmonic systems.

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