金纳米旋转椭球的折射率传感特性分析与优化

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。

Analysis and Optimization of Refractive Index Sensing of Gold Nanospheroid

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.