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。
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.
引文
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