随机微扰表面反射光谱的低角度依赖性  

Low Angular Dependence Characteristic of Reflection Spectra of Random Perturbation Surfaces

作　　者：张金英 李世豪 王瑞[1] 王鑫野 李卓[1,2] 王欣[1] 杨苏辉[1] 高彦泽 Zhang Jinying;Li Shihao;Wang Rui;Wang Xinye;Li Zhuo;Wang Xin;Yang Suhui;Gao Yanze(Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing 314001,Zhejiang,China)

机构地区：[1]精密光电测试仪器及技术北京市重点实验室,北京理工大学光电学院,北京100081 [2]北京理工大学长三角研究院,浙江嘉兴314001

出　　处：《光学学报》2023年第1期227-235,共9页Acta Optica Sinica

基　　金：国家自然科学基金(62174012,61704166);国家重点研发计划(2018AAA0100301)。

摘　　要：结构色在光学伪装等领域具有重要的应用前景,但其存在严重的角度依赖性。提出利用随机微扰表面降低反射光谱角度依赖性的方法;研究了不同微扰特征的粗糙表面结构在不同入射角下的反射光谱;通过有限元法计算了横电波、横磁波的反射光谱特性和能量传播特性,并据此获得了等效自然光的反射光谱和角度依赖规律。分析发现在0°~40°入射角度范围内,平整表面结构的反射光谱峰值移动了34.0 nm,随机微扰表面结构的反射光谱峰值仅移动了10.0 nm,角度依赖特性降低了70.6%,结果表明微扰表面结构对于降低角度依赖性具有显著作用。Objective Structural color has the outstanding advantages of high chemical stability and low environmental pollution. In recent years, it has received great attention from researchers in the fields of optical camouflage, dynamic display, secure communication, etc. Traditional structural color devices mainly use flat films or one-dimensional, two-dimensional, and three-dimensional periodic micro/nano structures. The anisotropic characteristics of these structures determine that the structural color has an angle dependence. The colors are different when we view from different angles, which limits its applications in many fields such as optical camouflage. It can only achieve camouflage effects from a certain detection angle. The reported work has experimentally verified that the angle dependence can be reduced by breaking the periodicity of three-dimensional structures so that they no longer have the anisotropic characteristics. However, it has not been studied from the perspective of theoretical calculation to indicate what kind of quasi-amorphous structures can achieve what degree of angle dependence reduction. In this paper, a random perturbation surface structure that can reduce the angle dependence is studied theoretically. Compared with the flat film structure, the effect of the perturbation surface structural parameters on reducing the angle dependence is calculated.Methods The color of the film interference structure is mainly determined by the central wavelength of the reflection spectrum. Therefore, we use the shift of the central wavelength peak to measure its angle dependence. In this paper, a finite element method(FEM) model of thin-film interference structures is established to investigate the reflection characteristics. In order to verify the validity of the model, the reflection spectra at perpendicular incidence of the FEM model are compared with those of multi-beam interference method and the measured fabricated samples. The FEM simulation results agree well with calculation results of the multi-b

关 键 词：表面光学 微扰表面 结构色 角度依赖特性 光学伪装 

分 类 号：TN202[电子电信—物理电子学]