基于光子晶体的红外光与激光兼容伪装材料结构设计

Design of infrared and laser band compatible camouflage structure based on photonic crystals

基于光子晶体结构,利用薄膜光学特征矩阵法,通过计算由碲化铅和氟化钡构建的一维光子晶体复合结构的反射谱和透射谱,研究实现近、中、远红外光与波长为1.060μm和10.600μm的激光兼容伪装的可行性,并通过计算该光子晶体横电波(TE波)和横磁波(TM波)的全向带隙图,探讨入射光入射角变化对光子晶体结构带隙的影响。研究结果表明:经优化设计的一维光子晶体复合结构在入射光正入射时,可以实现近、中、远红外光与波长为1.060μm和10.600μm波长激光的良好兼容伪装;无论是TM波还是TE波,当入射角增大时,在1~5μm和8~14μm的红外波段仍能保持良好伪装效果,但缺陷位置会向短波方向移动,激光伪装效果降低。

The reflection and transmission spectra of the one-dimensional composite photonic crystal structure oflead-telluride and barium-fluoride were calculated by the characteristic matrix method of thin-film optics theory, and thepossibility of compatible camouflage of the wide band infrared and laser was discussed. Furthermore, theomni-directional band-gap diagram of the composite photonic crystal structure under TE or TM wave was calculated toexplore the effects of the changing incident angle. The results show that compatible camouflage of the wide band infraredand laser of 1.060 μm or 10.600 μm is achievable when incident light is normal to the designed composite structure. Nomatter the incident wave is TM or TE wave, when the incidence angle increases, infrared camouflage in 1？5 μm and8？14 μm can also be maintained. But the defect mode moves to the shortwave band, and the laser camouflage isdiminished.