利用时域有限差分法模拟金纳米球及球壳的光学特性

摘要

利用时域有限差分方法研究了金纳米球、金纳米球壳及多层球壳的消光特性及电场分布。结果表明：金纳米颗粒的几何参量对消光峰的位置有显著影响。随着SiO2核心半径的增大，金纳米壳的消光峰显著红移。随着金核心半径的增大，gold‐silica‐gold多层球壳消光谱的低能峰显著红移，而高能峰微弱蓝移。%T he optical properties and electric field distribution of gold nanospheres , gold nanoshells ,and gold‐silica‐gold multilayer nanoshells were studied using finite‐difference time‐domain method .The experiment results showed that the geometric parameters of gold nanoparticles had a sig‐nificant impact on the position of extinction peak .When the radius of SiO2 core increased ,the extinc‐tion peak of gold nanoshell had a blue shift ;when the radius of Au core increased ,the extinction low‐energy peak of gold‐silica‐gold multilayer nanoshells had a red shift ,and the extinction high‐energy peak had a weak blue shift.