Yang Jie, Cao Qing, Zhou Changhe
State Key Lab of High Field Laser Physics, Information Optics Lab, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 390 Qinghe Road, Jiading District, Shanghai 201800, China.
Opt Express. 2010 Aug 30;18(18):18550-7. doi: 10.1364/OE.18.018550.
We investigate the propagation properties of terahertz plasmon of a metallic nanowire with sub-skin-depth diameter. By taking the small radius and the huge relative permittivity into account, we establish an approximate analytical description for this kind of surface plasmon. It is shown that the main propagation properties are closely related to the product of the radius of the metallic nanowire and the complex wave number of the metal. In addition, when the radius of the metal wire is smaller than the skin-depth, the size of the modal field is simply proportional to the radius of the metal wire. We also carefully verify these analytical predictions with rigorous numerical simulations.
我们研究了具有亚趋肤深度直径的金属纳米线太赫兹表面等离子体激元的传播特性。通过考虑小半径和巨大的相对介电常数，我们建立了这种表面等离子体激元的近似解析描述。结果表明，其主要传播特性与金属纳米线半径和金属复波数的乘积密切相关。此外，当金属线半径小于趋肤深度时，模式场的大小与金属线半径成正比。我们还通过严格的数值模拟仔细验证了这些解析预测。
