Jandieri Vakhtang, Meng Peiwen, Yasumoto Kiyotoshi, Liu Yunfei
J Opt Soc Am A Opt Image Sci Vis. 2015 Jul 1;32(7):1384-9. doi: 10.1364/JOSAA.32.001384.
Light scattering by a grating of the metal (Ag)-coated nanocylinders supported on the dielectric substrate is investigated using an accurate and rigorous formulation based on the recursive algorithm combined with the lattice sums technique. The proposed approach could be applied easily to the various configurations of the grating composed of the metal or metal-coated nanocylinders with different types and locations of the excitation sources. Special attention is paid to the three types of resonances: (a) surface plasmon resonances associated with the metal nanocylinders, (b) Rayleigh anomalies related with the periodic nature of the grating, and (c) resonances due to the coupling between the grating and the dielectric substrate. Near-field distribution of the magnetic field, which is parallel to the axis of the nanocylinders, is investigated numerically. Physical insight is given to the localization of the field along the interfaces of the metal nanocylinders, formation of the strong reflected field by the grating, and the field enhancement at the surface of the dielectric substrate. The accuracy of the numerical analyses has been tested based on the principle of the energy conservation. All these features are technologically important and have wide practical application from the viewpoint of the flexible design and fabrication of the plasmonic optical devices.
利用基于递归算法并结合晶格求和技术的精确而严格的公式，研究了支撑在介电基片上的金属（银）涂层纳米圆柱体光栅的光散射。所提出的方法可以很容易地应用于由具有不同类型和位置的激发源的金属或金属涂层纳米圆柱体组成的光栅的各种配置。特别关注三种类型的共振：（a）与金属纳米圆柱体相关的表面等离子体共振，（b）与光栅周期性相关的瑞利异常，以及（c）由于光栅与介电基片之间的耦合引起的共振。对平行于纳米圆柱体轴的磁场的近场分布进行了数值研究。对沿金属纳米圆柱体界面的场的局域化、光栅形成的强反射场以及介电基片表面的场增强给出了物理见解。基于能量守恒原理测试了数值分析的准确性。从等离子体光学器件的灵活设计和制造的观点来看，所有这些特性在技术上都是重要的，并且具有广泛的实际应用。
