德鲁德分布非均匀膜的光学特性模拟分析

Simulation Analysis of Optical Characteristics of Drude Inhomogeneous Coatings

从德鲁德理论出发,对多元共蒸法镀制的非均匀膜的折射率分布与沉积速率的关系进行了探讨;然后利用计算机辅助模拟,对德鲁德分布非均匀光学薄膜,从单周期和多周期、正变和负变、完整周期和存在半周期几个方面对其光学特性进行了系统分析.研究发现:其透射率的极小值和周期数的关系遵从周期数的三次多项式衰减规律,不同规律的德鲁德分布非均匀膜可用来设计不同功能的滤光片.

On the basis of Drude theory,the relationship of refractive index and the deposition rate ,which were changeable in the course of deposition of inhomogeneous coatings, was discussed firstly. Then using computer aided simulation, the optical characteristics of inhomogeneous dielectric coatings, which was mixture of different materials from different evaporated sources, was also discussed. The discussion included single period and multi-periods, positive change and negative change, integral and half-baked periods, etc. The minimum of transmittance attenuated by thrice polynomial of periods was discovered, and the negative Drude inhomogeneous coatings with half-baked periods was the optimization design of Notch filters.