银包覆PMMA纳米核壳颗粒的局域表面等离激元共振行为的模拟计算  

Simulation on Localized Surface Plasmon Resonance Behaviors of Nanosized PMMA/Ag Core-Shell Structure

作　　者：李强[1,2] 王连洲[1,3] 逯高清[1,3] 黄娆[1] 朱贤方[1,3,4] 

机构地区：[1]厦门大学物理系中国-澳大利亚功能纳米材料联合实验室,福建厦门361005 [2]新疆大学物理科学与技术学院,新疆乌鲁木齐830046 [3]ARC Centre of Excellence for Functional Nanomaterials,University of Queensland,St.Lucia,Brisbane,Qld 4072,Australia [4]中国科学院固体物理研究所,安徽合肥230031

出　　处：《光学学报》2011年第7期227-231,共5页Acta Optica Sinica

基　　金：国家科技计划国际科技合作与交流专项(2008DFA51230);国家973计划(2007CB936603);国家自然科学基金(11074207;50861007)资助课题

摘　　要：应用米氏理论,对银膜包覆PMMA纳米核壳结构的局域表面等离激元共振行为进行了模拟计算,研究了颗粒尺寸、核壳比等参数对纳米核壳结构局域表面等离激元共振消光光谱的影响;同时将其与实心银纳米球的局域表面等离激元共振光谱行为进行了比较。结果表明,相对于实心银纳米球,银膜包覆PMMA纳米核壳结构的共振峰位更加红移,且共振峰的宽度更窄。这些性能上的提高,是由于纳米PMMA介质核的存在减弱了电子云振荡过程中的滞后效应,利于化学生物传感器方面的应用。Localized surface plasmon resonance（LSPR） spectrum behaviors of PMMA/Ag core-shell nanoparticles are extensively and systematically simulated by a calculation method based on Mie theory.Through the simulation calculation,the dependence of the LSPR behaviors of the core-shell nanoparticle on nanoparticle size,ratio of the radius of PMMA core to the thickness of Ag shell,and some other factors is studied.Furthermore,LSPR behaviors of Ag nanoparticles are simulated as well for comparison.The simulation results show that the nanosized PMMA dielectric core can weaken the retardation effects in the process of free electron resonance in the Ag nanoshell.Thus,compared with the LSPR of Ag nanoparticles,the position of the LSPR peak of the PMMA/Ag core-shell nanoparticles has an even more obvious red shift and the width of the LSPR becomes even narrower.Such simulation results indicate that the core-shell nanoparticles would have more advantages over Ag nanoparticles for potential applications of future chemical and biological nanosensors.

关 键 词：局域表面等离激元共振 米氏理论 模拟计算 银包覆PMMA纳米核壳颗粒 AG纳米颗粒 

分 类 号：O436.2[机械工程—光学工程]