置于不同基底表面的单一金纳米粒子的近场特性  

Near-Field Properties of a Single Gold Nanoparticle Placed on Various Substrate Surfaces

作　　者：王聪[1] 陶海岩[1] 

机构地区：[1]长春理工大学超快光学实验室,吉林 长春

出　　处：《应用物理》2020年第2期147-152,共6页Applied Physics

摘　　要：本文采用时域有限差分方法仿真研究了金粒子在金属(金),半导体(硅)和电介质(二氧化硅)基底表面经飞秒激光激发后的近场(电场)特性。仿真结果表明,在三种基底条件下,基底表面的电场均被增强,但电场的强度、空间分布以及尺寸大小均取决于基底材料。在金属基底和半导体基底条件下,电场被局限在粒子与基底的接触点周围。由于基底材料的不同,导致能够产生最大增强因子的共振波长发生偏移。该研究对于调控增强因子,实现超衍射极限纳米结构的精细加工具有重要意义。In this paper, the finite-difference time-domain method is used to simulate the near-field (electric field) characteristics of a single gold nanoparticle on the surface of a metal (gold), semiconductor (silicon), and dielectric (silicon dioxide) substrate excited by a femtosecond laser. The simulation results show that the electric field on the substrate surface is enhanced under three substrate conditions, but the strength, spatial distribution, and size of the electric field all depend on the substrate material. Under the conditions of metal substrates and semiconductor substrates, the electric field is confined around the contact points between the particles and the substrate. Due to the difference of the base material, the resonance wavelength that can produce the maximum enhancement factor is shifted. This study is of great significance for regulating enhancement factors and achieving fine processing of ultra-diffraction-limited nanostructures.

关 键 词：飞秒激光 金纳米粒子 近场增强 超衍射极限 

分 类 号：G63[文化科学—教育学]