利用K-K关系计算量子点玻璃的介电函数  

Dielectric function of quantum dots doped glasses obtained by K-K relation analysis

作　　者：陈钢[1] 徐军[1] 

机构地区：[1]浙江工业大学应用物理系,浙江杭州310023

出　　处：《光电子．激光》2015年第5期894-898,共5页Journal of Optoelectronics·Laser

基　　金：浙江工业大学校基金重点项目(2013XZ010)资助项目

摘　　要：为了得到PbSe量子点(QD)玻璃的光学常数,为实验制备QD材料提供定性和定量参考,本文利用实验中测量的吸收光谱,结合米氏散射理论和克拉默斯-克勒尼希(K-K)关系,通过多次迭代运算,从吸收光谱中分离出相应的介电函数的实部和虚部,最终获得材料的光学常数。为了使矩阵迭代运算能够快速收敛,设计了一种快速、不产生奇异矩阵的简便方法。计算得给出的PbSe QD玻璃的介电函数与实验测量得到的胶体QD介电函数分布非常相似,表明本文方法能够用于快速测定QD玻璃的介电函数。本文方法可以推广到其他液体、固体和气体材料光学常数的测量中,为纳米材料制备提供一定的参考。In order to obtain the optical coefficient of quantum dots doped glasses and provide qualitative and quantitative analysis in the preparation process of quantum dots, a procedure combining the G. Mie scatter theory and the Kramers-Kronig relations is used to calculate the real and imaginary parts of the dielectric function from the experimental absorption spectrum by iterative method. A simple and quick method is developed to avoid the singular matrix in the process of matrix iterative approach. The calcu- lated results of the dielectric function of PbSe quantum dots doped glasses are very similar to the experi- mental results of colloidal PbSe quantum dots. This method can conveniently get the dielectric coeffi- cients of many types of materials, such as liquid, solid and gas materials. It can be a good reference for the manufacture of other nano materials.

关 键 词：量子点(QD)玻璃 克拉默斯-克勒尼希(K-K)关系 介电函数 吸收光谱 

分 类 号：O43[机械工程—光学工程]