Role of diffusive surface scattering in nonlocal plasmonics
Role of diffusive surface scattering in nonlocal plasmonics
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扩散表面散射在非局域等离子体激元中的作用
DOI：
10.1088/1361-648x/ab977d
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
C. Tserkezis
中科院分区：
文献类型：
--
作者：
M. Svendsen;C. Wolff;A. Jauho;N. Mortensen;C. Tserkezis
分析了最新的等离子体非局域光学响应(GNOR)理论，并将其主要输入参数，即复流体对流扩散常数，用电子在金属表面的扩散表面散射引起的朗道衰减增强来量化。GNOR通过在传统的非局域等离子体Drude流体动力学模型中引入唯象电子扩散项，成功地描述了等离子体激元的衰减效应，以及由感应电荷屏蔽引起的频率漂移。尽管如此，它的微观推导和理由仍然缺乏。在这里，我们讨论了在标准流体力学中加入类扩散项如何作为一种有效的工具来描述朗道阻尼，而不需要借助计算要求很高的量子力学计算，并建立了该项与电荷质心的Feibelman d参数之间的直接联系。我们的方法提供了一种方法，将唯象的基本GNOR参数与频率相关的微观表面响应函数联系起来。因此，我们解决了模型的主要局限性之一，并进一步阐明了它的有效性和局限性，从而促进了它在非经典等离子体框架中的适当应用。
The recent generalised nonlocal optical response (GNOR) theory for plasmonics is analysed, and its main input parameter, namely the complex hydrodynamic convection–diffusion constant, is quantified in terms of enhanced Landau damping due to diffusive surface scattering of electrons at the surface of the metal. GNOR has been successful in describing plasmon damping effects, in addition to the frequency shifts originating from induced-charge screening, through a phenomenological electron diffusion term implemented into the traditional hydrodynamic Drude model of nonlocal plasmonics. Nevertheless, its microscopic derivation and justification is still missing. Here we discuss how the inclusion of a diffusion-like term in standard hydrodynamics can serve as an efficient vehicle to describe Landau damping without resorting to computationally demanding quantum-mechanical calculations, and establish a direct link between this term and the Feibelman d parameter for the centroid of charge. Our approach provides a recipe to connect the phenomenological fundamental GNOR parameter to a frequency-dependent microscopic surface-response function. We therefore tackle one of the principal limitations of the model, and further elucidate its range of validity and limitations, thus facilitating its proper application in the framework of nonclassical plasmonics.
DOI：
10.1016/j.jqsrt.2018.05.026
发表时间：
2018-09-01
影响因子：
2.3
作者：
Eremin, Yuri;Doicu, Adrian;Wriedt, Thomas
通讯作者：
Wriedt, Thomas
影响因子：
16.6
作者：
Toscano, Giuseppe;Straubel, Jakob;Wubs, Martijn
通讯作者：
Wubs, Martijn