金、银纳米结构中的非局域吸收特性  

Nonlocal Absorption in Gold and Silver Nanostructures

作　　者：刘建晓 刘啸岚 陆华丽[1] 高英杰[3,4] 姜严 唐万春[1] LIU Jianxiao;LIU Xiaolan;LU Huali;GAO Yingjie;JIANG Yan;TANG Wanchun(School of Physics Science and Technology,Nanjing Normal University,Nanjing,Jiangsu 210023,China;School of Electronics and Information Engineering,Hengshui University,Hengshui,Hebei 053000,China;School of Electronics and Information Engineering,JinlingInstitute of Technology,Nanjing,Jiangsu 211169,China;School of Information Science and Engineering,Southeast University,Nanjing,Jiangsu 210009,China)

机构地区：[1]南京师范大学物理科学与技术学院,江苏南京210023 [2]衡水学院物理系,河北衡水053000 [3]金陵科技学院电子与信息工程学院,江苏南京211169 [4]东南大学信息科学与工程学院,江苏南京210009

出　　处：《计算物理》2021年第2期206-214,共9页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(61701204);河北省自然科学基金青年基金(F2019111025);河北省高等学校青年拔尖人才基金(BJ2020206);江苏省博士后科研基金(1701073B)资助项目。

摘　　要：采用时域有限差分方法(FDTD)研究金、银纳米结构的非局域吸收。对金属材料的Drude-Lorentz模型进行离散差分,详细推导各项迭代系数。研究一维、二维、三维金、银纳米结构的吸收特性。讨论一维分层纳米薄膜吸收率与材料的关系。结果表明:非局域分层介质板仍然符合等效介质理论。在一维、二维情况下,金、银纳米结构的非局域吸收峰只与纳米尺度相关而与材料无关。三维纳米结构的非局域吸收特性不仅与纳米尺度相关还与材料特性相关。三维纳米结构尺度更小,非局域效应表现也更为明显,吸收峰的蓝移也更大。因此,三维纳米颗粒有望在纳米材料以及纳米器件的研究中发挥更大的作用。Nonlocal absorption of gold and silver nanostructures is studied with ADE-FDTD method.A Drude-Lorentz model of metal material is discretized and iterative coefficients are deduced in detail.Absorption characteristics of one-,two-and three-dimensional gold and silver nanostructures are studied.It shows that the nonlocal layered films conforms to the equivalent medium theory.In one-and two-dimensional cases,nonlocal absorption peaks are related to the nano scale and have no relation with the material.The nonlocal absorption properties of three-dimensional nanostructures are related to nanoscale,and to material as well.Nonlocal effect of three-dimensional nano structures is the strongest,and the blue shift of the absorption peak is larger.Therefore,three-dimensional gold and silver nano structures are expected to play a role in nano devices.

关 键 词：FDTD 非局域 吸收 金、银纳米结构 

分 类 号：O485[理学—固体物理]