金属纳米颗粒双圆环阵列的表面格点共振效应  

Surface lattice resonance effect of double-ring array of metallic nano-particles

作　　者：叶高杰 殷澄 黎思瑜 俞强[3,4] 王贤平 吴坚[4] Ye Gao-Jie;Yin Cheng;Li Si-Yu;Yu Qiang;Wang Xian-Ping;Wu Jian(College of Internet of Things Engineering,Hohai University,Changzhou 213022,China;College of Physics and Communication Electronics,Jiangxi Normal University,Nanchang 330022,China;i-Lab,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China;College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]河海大学物联网工程学院,常州213022 [2]江西师范大学物理与通信电子学院,南昌330022 [3]中国科学院苏州纳米技术与纳米仿生研究所创新实验室,苏州215123 [4]国防科技大学前沿交叉学科学院,长沙410073

出　　处：《物理学报》2023年第10期183-191,共9页Acta Physica Sinica

基　　金：中央高校基本科研业务费专项资金(批准号:B220202018);常州市科技计划(批准号:CJ20210130);冶金工业过程系统科学湖北省重点实验室(武汉科技大学)开放基金(批准号:Y202208)资助的课题。

摘　　要：由金属纳米粒子构成的周期性规则阵列,可以通过粒子间的耦合来激发表面格点共振效应,从而极大压缩单粒子的局域表面等离子体共振效应的线宽.本文将该表面格点共振效应从二维周期性结构推广到轴对称的圆环结构中,提出了双圆环金属纳米粒子阵列结构的电磁响应模型.在此基础上,得到了双圆环阵列发生表面格点共振效应的条件,并发现当阵列结构参数满足特定条件时,该阵列的所有偶极子分量会发生集体共振效应,从而获得极高的近场增强因子.Surface lattice resonances due to regular periodic array of metallic nanoparticles can be attributed to the mutual coupling between the localized surface plasmon resonances of different nanoparticles.A comparison of resonant effect between the single particle and the array shows that the resonance line width can be significantly reduced.In this paper,we extend the coupled dipole approximation to solving the electromagnetic characteristics of the particle ring structures with rotational symmetry,and propose an analytical model for the double ring array of metallic nano-particles.Furthermore,we derive the general resonant condition of the double ring array and investigate some concrete cases in detail.It shows that the full resonance of the whole array depends crucially on the structural parameters,whose enhancement factor can be extremely high.But a slight change in the structural parameter willlead the enhancement factor to decrease sharply.We also find that the radiation field of the full resonance effect will be independent of the external field,which provides us a simple approach to producing a localized optical field with complex space distribution.This proposed structure can possess potential applications in various fields such as metasurface,optoelectronics,optical manipulation,communication,and biosensing.

关 键 词：表面等离激元共振 纳米阵列 金属纳米粒子 

分 类 号：TB383.1[一般工业技术—材料科学与工程]