https://www.tf.uni-kiel.de/matwis/amat/elmat_en/kap_3/backbone/r3_7_1.html

https://www.zhihu.com/question/520771623

https://zhuanlan.zhihu.com/p/303168568

参考资料：
(1) 光学教学笔记之少见多怪-科学网-姬扬
(2) Determination of the complex refractive index of powder phosphors-OME-2017