三角形金属纳米结构的局域表面等离共振传感特性与优化分析  

Shape Optimization and Analysis of Sensing Properties of Localized Surface Plasmon Resonances for Triangle Metal Nanoparticles

作　　者：罗庭军[1] 万玲玉[1] 黄继钦[1] 庞霖[1,2] 张卫平[1] 

机构地区：[1]广西大学物理科学与工程技术学院,广西南宁530004 [2]四川大学物理科学与技术学院,四川成都610064

出　　处：《光学学报》2013年第5期234-242,共9页Acta Optica Sinica

基　　金：国家自然科学基金(10964001)资助课题

摘　　要：采用三维时域有限差分法,数值研究了不同几何参数下,三角形金属纳米颗粒的局域表面等离共振特性和传感特性。给出了三角形的高、顶角、顶角曲率半径和间距4个参数对单三角形和双三角形金纳米结构的消光谱、体折射率灵敏度和品质因子等的影响,并提出了优化三角形金属纳米结构传感性能的方法。经优化的双三角金属纳米结构的体折射率灵敏度达941nm/RIU,品质因子达6.8。Using three-dimensional （3D） finite-difference time-domain method, optical and sensing properties of local surface plasmon resonances of triangle metal nanoparticles with different geometric parameters are studied numerically. The influences of four parameters, including the height, the tip angle, the radius of curwture of vertex angle of the triangle and the gap, on the extinction spectra, bulk refractive index sensitivities and figures of merit of single-triangle and bi-triangle gold nanostructures are analyzed in detail. An optimization method of sensing properties is given based on the results of numerical calculation. An optimization bi-triangle nanostructure with the bulk refractive index sensitivity of 941 nm/RIU and figure of merit of 6.8 is presented.

关 键 词：表面光学 局域表面等离共振 三角形金属纳米颗粒 双三角纳米结构 传感特性 

分 类 号：O539[理学—等离子体物理]