Modal Analysis of Deep Nanoscale Plasmonic Structures: Nonlocal Hydrodynamic Approach

被引:0
|
作者
Kupresak, Mario [1 ]
Zheng, Xuezhi [1 ]
Vandenbosch, Guy A. E. [1 ]
Moshchalkov, Victor V. [2 ]
机构
[1] Katholieke Univ Leuven, Dept Elect Engn ESAT TELEMIC, Kasteelpk Arenberg 10 Bus 2444, B-3001 Leuven, Belgium
[2] Katholieke Univ Leuven, Inst Nanoscale Phys & Chem INPAC, Celestijnenlaan 200D, B-3001 Leuven, Belgium
关键词
nonlocal hydrodynamic model; additional boundary condition; natural (quasi-normal) mode analysis;
D O I
10.23919/eucap48036.2020.9135686
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Since plasmonic structures at deep-nanometer scale cannot be fully handled by classical electromagnetics, a semiclassical hydrodynamic model has been introduced. The hydrodynamic model essentially describes the motion of the free electron gas in nonlocal metals by imposing additional boundary conditions (ABC). In this work, the hard wall hydrodynamic model with the Sauter ABC is employed, to characterize the optical features of a spherical nanoparticle. The analysis is performed for the natural (quasi-normal) modes of the nanoparticle, supported by the plane wave response of the structure. It is shown that the studied hydrodynamic model provides multiple natural frequencies and natural modes. The natural frequencies are in excellent agreement with extinction resonances.
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页数:4
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