Surface plasmon dispersion relation at an interface between thin metal film and dielectric using a quantum hydrodynamic model

Surface plasmon dispersion relation at an interface between thin metal film and dielectric using a quantum hydrodynamic model
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使用量子流体动力学模型研究薄金属膜和电介质之间界面的表面等离子体色散关系

DOI:
10.1016/j.optcom.2017.06.005
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发表时间:
2017-11
期刊:
Optics Communicatios
影响因子:
--
通讯作者:
B. Guo
B. Guo
中科院分区:
其他
文献类型:
--
作者:
Y. Zhang;M. X. Gao;B. Guo

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本文详细研究了覆盖在半无限介质衬底上的金属薄膜表面激发的等离子体激元。利用量子流体力学理论,考虑量子统计效应和量子衍射效应,推导并给出了表面等离子体色散关系。讨论了金属薄膜特性rs和介电常数ε 1对色散关系的影响,即有和没有量子效应的影响。结果表明,增大rs会减弱量子效应,而增大ε 1则会增强量子效应.此外,等离子体激元色散关系与量子效应也比较了经典模型。本文提出的这种简单结构与量子流体力学理论可以用于产生有意义的结果,研究更复杂的系统相关的表面等离子体。
The plasmon excited at the surface of a thin metal film covering on a semi-infinite dielectric substrate is investigated in detailed. The surface plasmon dispersion relation is derived and presented by using the quantum hydrodynamic theory with taking into the quantum statistical and quantum diffraction effects. The effects of the thin metal film character r s and the dielectric constant ε 1 on the dispersion relations are shown and discussed, ie, without and with quantum effects. The results show that increasing r s weakens the quantum effects while increasing ε 1 can enhance the quantum effects. In addition, the plasmon dispersion relation with quantum effects is also compared to a classical model. This simple structure proposed in the paper with quantum hydrodynamic theory can be used for yielding meaningful results for studying more complex systems related to surface plasmons.
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