中国激光, 2019, 46 (1): 0113002, 网络出版: 2019-01-27
宽光谱广角蛾眼抗反射超表面结构设计分析 下载: 984次
Design and Analysis of Moth-Eye Antireflective Metasurface Structure with Broadband and Wide-Angle
光学设计 亚波长结构 蛾眼超表面结构 时域有限差分法 光学窗口 optical design sub-wavelength structure moth-eye metasurface structure finite difference time domain method optical window
摘要
本研究采用严格耦合波分析法设计具有宽带广角抗反射特性的ZnS MS材料的蛾眼亚波长周期微纳结构。基于严格耦合波理论, 控制周期尺寸小于入射波长与材料折射率的比值, 实现高级次衍射波为倏逝波, 以提高蛾眼结构宽带抗反射效率。采用时域有限差分法分析蛾眼结构周期、底端直径、结构高度和顶端直径对光谱透过率的影响, 并对4种结构参数进行优化。此外, 还选取可见光、近红外和中红外三个特征波长进行宽角度入射的电场分析。研究结果表明:在短波范围内, 蛾眼宽角度抗反射性能取决于结构表面的减反射和前向散射的能力; 而在长波范围内, 蛾眼结构被视为ZnS MS平面膜层, 其光谱特性主要受Fabry-Perot干涉影响。该研究为不同波段宽角度蛾眼结构设计提供了理论依据和设计方法。
Abstract
A bionic moth-eye sub-wavelength periodic micro-nanostructure of ZnS MS material, with broadband and wide-angle antireflection properties is designed by the rigorous coupled-wave analysis method. According to the rigorous coupled wave theory, a suitable control of periodic size, smaller than the ratio between the incident wavelength and the refractive index of materials, makes the high-order diffracted wave as an evanescent wave, and thus the broadband antireflection efficiency of this moth-eye structure is enhanced. The finite difference time domain algorithm is used to investigate the effects of moth-eye structural period, bottom diameter, structural height and top diameter on spectral transmissivity. Moreover, four structural parameters are optimized. In addition, three characteristic wavelengths in the visible, near-infrared and middle-infrared regime are selected for the electric field analysis under a wide-angle incidence. The research results show that in the short-wavelength range, the moth-eye wide-angle anti-reflection performance is determined by the anti-reflection and forward-scattering ability of this structural surface, while in the long-wavelength range, the moth-eye structure is regarded as a ZnS MS plane film, and its spectral properties are mainly affected by the Fabry-Perot interference. This study provides a theoretical basis and a design method for the design of moth-eye wide-angle structures under different wavelengths.
林鹤, 付跃刚, 欧阳名钊, 赵宇, 朱启凡, 吴锦双. 宽光谱广角蛾眼抗反射超表面结构设计分析[J]. 中国激光, 2019, 46(1): 0113002. Lin He, Fu Yuegang, Ouyang Mingzhao, Zhao Yu, Zhu Qifan, Wu Jinshuang. Design and Analysis of Moth-Eye Antireflective Metasurface Structure with Broadband and Wide-Angle[J]. Chinese Journal of Lasers, 2019, 46(1): 0113002.