With the increase of the periods and the absolute value of refractive index difference, the full width at half maximum of spectrum decreases. 介质折射率差的绝对值越大、周期数增加都使透射波谱宽度变窄。
Through analysis, a conclusion can be made that the absolute value of equivalent negative refractive index will decrease with the increase of thickness. 分析发现,其等效折射率的绝对值随厚度的增加,有所减小,但影响不大,可以忽略。