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研究了光在一维周期性介电材料中的传播特性 ,指出传统的高反膜只是光子晶体的一个特例 ,从而从光子晶体的角度对多层膜系的设计提出了一条新的思路 ,同时研究了材料的介电常数以及结构与高反带带宽之间的关系。最后通过在多层膜中引入掺杂 (中间一层被另一种介质所代替 ) ,得到第一能隙中掺杂模式的频率与掺杂材料的介电常数之间的对应关系 ,由此提出一种精确测量介质介电常数的方法。
The propagation characteristics of light in one-dimensional periodic dielectric materials are investigated. It is pointed out that the conventional high-reflective film is only a special case of photonic crystals. Therefore, a new idea is proposed for the design of multi-layer films from the perspective of photonic crystals. The relationship between the dielectric constant of the material and the structure and the bandwidth of the high reverse band is studied. Finally, by introducing doping in the multilayer film (the middle layer is replaced by another medium), a correspondence between the frequency of the doping mode in the first energy gap and the dielectric constant of the doping material is obtained A precise method of measuring dielectric permittivity is proposed.