数值模拟单个金纳米棒的吸收和散射特性  

Simulation of the Optical Scattering and Absorption Apectra of Gold Nanorods

作　　者：邓海东[1] 杨小红[1] 郭子政[1] 

机构地区：[1]华南农业大学理学院,广州510642

出　　处：《江西科学》2014年第3期272-274,300,共4页Jiangxi Science

基　　金：广东省自然科学基金项目(NO:S2012040007719)

摘　　要：利用时域有限差分的方法,数值模拟了单个金纳米棒的吸收、散射和消光特性,比较了在相同长径比,不同长轴金纳米棒的吸收和散射效率。数值计算结果表明:金纳米棒的散射效率会随着金纳米棒的几何尺寸的增大而逐渐增强,并且其散射谱的半高宽也随之变宽;与之相反的是,金纳米棒对入射光的吸收效率随金纳米棒体积的增大却呈现出先增加后减小的变化规律。数值模拟结果将为金纳米棒在太阳能电池光俘获方面的应用提供有益的理论参考。We calculated the scattering and absorption cross sections of a single gold nanorod with the finite-difference time-domain method and compared the scattering and absorption efficiency of the same aspect ratio and different lengths. It is shown that the scattering efficiency enhances gradually with the increase of the sizes of the gold nanorods, and the FWHM widens. On the contrary, the absorption efficiency increases firstly and then decreases with the increase of the sizes of the gold nanorods. The results presented in this work provide helpful reference for the applications of gold nanorods in doped solar cells.

关 键 词：时域有限差分算法(FDTD) 金纳米棒 表面等离子共振 

分 类 号：O439[机械工程—光学工程]