金属纳米球颗粒的非局域等效电磁参数  

The nonlocal equivalent electromagnetic parameters of the metallic nanosphere particle

作　　者：孙坚[1] 黄杨[2] 潘涛[1] 徐国定[1] 汤丽丽[3] 

机构地区：[1]苏州科技学院数理学院,江苏苏州215009 [2]苏州大学物理与光电.能源学部,江苏苏州215006 [3]苏州科技学院电子与信息工程学院,江苏苏州215009

出　　处：《大学物理》2015年第12期9-13,共5页College Physics

基　　金：江苏省青年基金项目(BK20130284);江苏省省高校自然科学研究项目(13KJB140017);苏州科技学院自然科研基金项目(XKZ201403)资助

摘　　要：基于电磁散射理论,利用散射等效原理,将具有空间色散(非局域)介电特性的金属纳米球颗粒转换成无空间色散(局域)介电特性的颗粒,并得到其等效介电常量和等效磁导率.结合实例,发现由于金属纳米球颗粒内部纵模电场的存在,在这两种情况下的电磁参数存在差异,且在低频段现象尤为明显.Based on the electromagnetic scattering theory and the equivalent principle for the electromagnetic scattering, we transform the metallic nanosphere particle with the permittivity properties including spatial dispersion （or nonlocal effect） into that in the local case without spatial dispersion, and further obtain the equivalent permittivity and permeability for the metallic nanosphere particle with spatial dispersion. Finally, with a concrete example, it is found that because of the existence of the longitudinal mode field inside the metallic nanosphere particle, there are the differences for the electromagnetic parameters between both above cases, which is especially obvious in the low-frequency region.

关 键 词：等效介电常量 等效磁导率 非局域 MIE理论 散射截面 

分 类 号：O441[理学—电磁学] O571.553[理学—物理]