Discrete sources method for modeling the nonlocal optical response of a nonspherical particle dimer
Discrete sources method for modeling the nonlocal optical response of a nonspherical particle dimer
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DOI：
10.1016/j.jqsrt.2018.05.026
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发表时间：
2018-09-01
影响因子：
2.3
通讯作者：
Wriedt, Thomas
中科院分区：
文献类型：
--
作者：
Eremin, Yuri;Doicu, Adrian;Wriedt, Thomas
已经开发了离散源方法的修改方案，用于模拟由两个相同的轴对称金属颗粒组成的等离子体二聚体的非局部光学响应。已在频域中计算了具有不同纵横比和不同间隙尺寸的长球体的光学横截面。结果表明，与局部响应近似相比，广义非局部光学响应模型导致光学截面发生蓝移、等离子体激元模式阻尼和等离子体激元模式展宽。当球体的纵横比增加且间隙尺寸减小时，这些效应更加明显。已证实附加边界条件似乎是蓝移的主要来源。 (C) 2018 Elsevier Ltd. 保留所有权利。
A modified scheme of the discrete sources method for modeling the nonlocal optical response of a plasmonic dimer consisting of two identical axisymmetric metallic particles has been developed. The optical cross sections have been computed in the frequency domain for prolate spheroids with different aspect ratios and for different gap sizes. The results show that the generalized nonlocal optical response model leads to a blue shift, a plasmon mode damping, and a plasmon mode broadening of the optical cross sections as compared to the local-response approximation. These effects more pronounced when the aspect ratio of the spheroid increases and the gap size decreases. It has been confirmed that the additional boundary condition appears to be the main origin for the blue shift. (C) 2018 Elsevier Ltd. All rights reserved.