金纳米旋转椭球的折射率传感特性分析与优化  

Analysis and Optimization of Refractive Index Sensing of Gold Nanospheroid

作　　者：夏伊丁·亚库普 帕尔哈提江·吐尔孙[1,2] 武盼盼 YAKUPU Xiayiding;TUERSUN Paerhatijiang;WU Panpan(School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China;Laboratory of Novel Light Source and Micro/Nano-Optics, Xinjiang Normal University, Urumqi 830054, China)

机构地区：[1]新疆师范大学物理与电子工程学院,新疆乌鲁木齐830054 [2]新疆师范大学新型光源与微纳光学重点实验室,新疆乌鲁木齐830054

出　　处：《光散射学报》2020年第1期40-45,共6页The Journal of Light Scattering

基　　金：国家自然科学基金项目(11764042);新疆维吾尔自治区高校科研计划项目(XJEDU2016I032);新疆维吾尔自治区“百名青年博士引进计划”项目,新疆师范大学新型光源与微纳光学重点实验室招标课题(XJNUSYS092017A02)资助。

摘　　要：对于金纳米颗粒在化学和生物传感中的应用,找到具有高品质因子的金纳米颗粒形状是近年来的研究热点。基于T矩阵方法和介电函数的尺寸修正模型,本文从理论上定量研究了金纳米旋转椭球的尺寸对其折射率灵敏度、半峰宽以及品质因子的影响。为了获得最佳传感性能,对品质因子进行了优化,并得到了最优的颗粒尺寸参数。结果发现,短半轴为11 nm和长半轴为49 nm的金纳米旋转椭球具有最大品质因子6.76。优化后的金纳米旋转椭球可以作为理想的化学和生物传感器。本研究为金纳米旋转椭球在化学和生物传感的应用中提供重要的理论依据。For the application of gold nanoparticles in chemical and biological sensing,finding the shape of gold nanoparticles with high figure of merit has become a research hotspot in recent years.Based on the T-matrix method with the size-dependent dielectric function,the influence of the size of gold nanospheroids on its refractive index sensitivity,linewidth and figure of merit was studied quantitatively in this paper.In order to obtain the best sensing performance,the figure of merit was optimized and the optimal particle size parameters were obtained.The results show that the gold nanospheroids with the minor semi-axis of 11 nm and the major semi-axis of 49 nm has a maximum figure of merit of 6.76.The optimized gold nanospheroids can be treated as potential candidates for chemical and biological sensing.This study provides an important theoretical basis for the application of gold nanospheroids in chemical and biological sensing.

关 键 词：金纳米颗粒 T矩阵方法 传感 品质因子 优化 

分 类 号：O433.4[机械工程—光学工程] Q-334[理学—光学]