纳米半球壳结构光学调谐特性分析  

Tunable optical properties of gold semi-shell nanoparicles

作　　者：张兴坊[1] 闫昕[1] 刘凤收[1] 

机构地区：[1]枣庄学院光电工程学院,枣庄277160

出　　处：《四川大学学报（自然科学版）》2015年第6期1313-1317,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(11247237);山东省科技发展计划项目(2013GGA04021);山东省高校科技计划(J13LN07);枣庄科技计划(201343);枣庄学院博士科研基金资助

摘　　要：利用离散偶极近似法,理论研究了颗粒几何结构参数和物理特性对金纳米半球壳颗粒消光特性的影响.结果表明,随着壳层厚度的增大,消光共振波长先发生蓝移而后再红移,共振波长转向时对应的壳层厚度随内核材料及外界环境介电常数和颗粒间距的增大而增大.利用等离激元杂化理论和相位延迟效应对该现象进行了解释.The optical properties of gold semi-shell nanopartilces with different shell thicknesses, physical parameters and inter-particle separations are theoretically studied by discrete dipole approximation method. The numerical results show that the extinction resonance wavelength of semi-shell nanopartiele is first blue-shifted and then red-shifted as the shell thickness increases, the shell thickness corresponding to resonance wavelength shifting to opposite direction increases with the increase of the dielectric constants of inner core material and embedding medium and with that of the inter-particle separation be- tween two semi-shell nanoparticles. The shift of the resonance wavelength is ascribed to the mutual in- teractions between plasmon hybridization and phase retardation. The plasmon hybridization plays an important role as the shell thickness is thin, as the shell thickness gets thicker, phase retardation effect will become significant.

关 键 词：纳米颗粒 半球壳 等离激元杂化 壳层厚度 波长调谐 

分 类 号：O433.5[机械工程—光学工程]