核-卫星结构纳米颗粒二聚体LSPR理论分析  

Theoretical Analysis of LSPR for Core-satellite Nanostructure

作　　者：王庆兆 张文嘉 杜谦 刘国华[1] Wang Qingzhao;Zhang Wenjia;Du Qian;Liu Guohua(Engineering Research Center of Thin Film Optoelectronics Technology,Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,College of Electronic Information Technology and Optical Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]南开大学电子信息与光学工程学院,天津市光电传感器与传感网络技术重点实验室,薄膜光电子技术教育部工程研究中心,天津300350

出　　处：《南开大学学报（自然科学版）》2023年第3期13-17,共5页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：国家自然科学基金(61771261)。

摘　　要：利用时域有限差分(FDTD)方法,计算了由金纳米球和金纳米棒构成的核-卫星结构二聚体的局域表面等离子体共振(LSPR)特性.研究了金纳米球对金纳米棒耦合作用的影响.模拟出的散射光谱表明,在金纳米球的影响下,核-卫星结构二聚体的传感性能要明显优于单个金纳米棒.研究了不同金纳米球半径与不同金纳米棒长径比下的核-卫星结构二聚体的传感性能,总结出核-卫星结构二聚体的最优组装尺寸.结合偶极子共振模型和纳米颗粒的极化作用,对核-卫星结构二聚体的传感性能变化做了初步分析.The finite difference time domain(FDTD)method is used to calculate the local surface plasmon resonance(LSPR)characteristics of a core-satellite nanostructure composed of gold nanospheres and gold nanorods.The effect of gold nanospheres on the coupling of gold nanorods is studied.The simulated scattering spectra show that under the influence of gold nanospheres,the sensing performance of the coresatllite nanostructure is significantly better than that of a single gold nanorod.In addition,the sensing performance of core-satellite nanostructure with the size of gold nanosphere and the aspect ratios of gold nanorod was studied.Combining the dipole resonance model and the polarization of nanoparticles,a preliminary analysis is made on the changes in the sensing performance of the core-satellite nanostructure.

关 键 词：局域表面等离子共振 核-卫星二聚体 金纳米颗粒 时域有限差分 传感性能 

分 类 号：O614.122[理学—无机化学]