反射式多通道滤光片在光学通讯、光学成像、遥感高光谱等方面有着重要的应用。利用含缺陷一维光子晶体独特的带隙特性，依据其相应的能带理论，设计了一种由金属和介质组成的反射式多通道滤光片。这种滤光片通道的工作范围由光子带隙理论计算得到，通道个数由“光子晶体”缺陷的周期数决定，通道的位置利用等效相位厚度的方法确立。相对于传统的以经验为主的反射式多通道滤光片设计方法，这种基于光子晶体的带隙理论的设计能够从“光子”的角度给出此类反射式滤光元件的设计思路和理论解释。

Reflection filters have important application in optical communication, optical imaging, and hyperspectral remote sensing. This paper intendes to design a reflection multichannel filter consisting of metal and dielectric films on the basis of the unique characteristics of one-dimensional photonic crystals with defects and the corresponding band gap theory. The working frequency range of the multichannel filters can be calculated by photonic band gap theory. The number of channels is determined by the number of periods of the “photonic crystal” defects. The channel positions can be established through the equivalent phase thickness method. Compared with the conventional design method of reflection filters which is mainly based on experiences, this design method based on the photonic band gap theory can find the design idea and theoretical interpretation of the multichannel reflection filter from the point of “photon”.