掺杂物形状对混合粒子等效光学常数的影响

基于电磁场平均的概念,利用Maxwell-Garnett有效介质理论对含有椭球形掺杂物的混合粒子等效光学常数进行研究,分析了掺杂物形状比例参数和体积分数对混合粒子等效光学常数的影响.结果表明:掺杂物形状比例参数存在一个临界值,当形状比例参数小于临界值时,随着形状比例参数增加,含椭球形掺杂物的混合粒子等效光学常数与含球形掺杂物的混合粒子等效光学常数的差别增大;反之,形状比例参数对混合粒子等效光学常数的影响非常小.混合粒子的等效光学常数介于基体和掺杂物的光学常数之间,当掺杂物的体积分数增大时,混合粒子的等效光学常数趋向于掺杂物的光学常数.

Inclusion shape's effects on effective optical constants of mixed particles

Based on the concept of electromagnetic field average, the effective optical constants of mixed particles containing ellipsoidal inclusions were studied with Maxwell-Garnett effective medium theory. The effects of shape scale factors and volume fractions of inclusions on the effective optical constants of mixed particles were analyzed. The results show that: a critical value has been found in the shape scale factors of inclusion. When the shape scale factor is smaller than the critical value, the differences in the effective optical constants of mixed particles containing ellipsoidal and spherical inclusions increase with the growing shape scale factor. Otherwise, little effects are shown in the effects of shape scale factors on the effective optical constants of mixed particles. The value of effective optical constants for mixed particles varies between that for the background and inclusions. With the increase of volume fraction of inclusions, the effective optical constants of mixed particles will approach to those of inclusions.