发表机构
KU Leuven; University of Southern Denmark; Nanjing University of Aeronautics and Astronautics（荷语鲁汶大学; 南丹麦大学; 南京航空航天大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究开发了一款整合介观物理模型的MATLAB工具箱，用于模拟任意相对位置的等离激元球聚集体，可计算多种光学相关参数，为纳米等离激元领域提供了高效通用的模拟工具。
AI 中文摘要
介观物理模型包括流体动力学德鲁德模型（HDM）、广义非局域光学响应（GNOR）模型和表面响应模型（SRM），已被提出用于研究纳米结构中的非局域效应。将经典电磁学与这些介观材料模型相结合，催生了计算电磁学（CEM）算法的新发展或对传统算法的改进，这一领域被称为计算介观电磁学（CMEM）。本研究中，我们开发了一款MATLAB工具箱，用于模拟具有任意相对位置的多个球形界面，同时整合了上述介观模型。该方法利用矢量球谐函数准确表达电场和磁场，采用S矩阵公式高效处理球形界面处的入射场和散射场，并借助平移矩阵处理具有不同展开中心的传播波。激发源可从任意偏振平面波、偶极子和电子束中选择。在后处理部分，实现了截面计算、远场/近场映射、荧光增强、珀塞尔因子和量子产率，以及阴极发光和电子能量损失概率的计算。该工具箱采用模块化方式构建，每个部分（例程）都有其重要功能。本文详细介绍了这款高效通用工具箱，并为纳米等离激元领域的研究人员提供了详细使用指南。
英文摘要
Mesoscopic physical models, including the Hydrodynamic Drude Model (HDM), the Generalized Nonlocal Optical Response (GNOR) Model, and the Surface Response Model (SRM), have been proposed to investigate nonlocal effects in nanometric structures. The combination of classical electromagnetism with these mesoscopic material models calls for new computational electromagnetic (CEM) algorithms, or update of conventional ones, in what is termed computational mesoscopic electromagnetics (CMEM). In this work, we present a MATLAB toolbox for the simulation of multiple spherical interfaces with arbitrary relative positions, with the incorporation of the aforementioned mesoscopic models. The method exploits vector spherical wave functions to properly express electric and magnetic fields, an S matrix formulation for the efficient treatment of incident and scattered fields at spherical interfaces, and a translation matrix to deal with propagating waves with different expansion centers. Excitation sources can be chosen among arbitrarily polarized plane waves, dipoles and electron beams. For the post-processing part, the calculation of cross sections and far/near-field mapping; fluorescence enhancement, Purcell factor and quantum yield; and cathodoluminescence and electron energy-loss probability is implemented. The toolbox is built in a modular manner, and each part (routine) has its own important functionality. This paper provides a full explanation of the proposed highly efficient and general toolbox, and a detailed guideline for researchers in the nanoplasmonics community.
Comments34 pages, 9 figures
