Optical coatings composed of thermomechanically superior materials with high reflectance in the broadband spectrum have recently attracted attention. Tungsten (W), among other VIB group materials, suits well for applications that require high thermomechanical stability but suffer from low reflectivity below 1 µm. This paper proposes a bio-inspired multilayer structure that lowers Tungsten's absorption over a broadband spectrum. The proposed design mimics the patterns observed on Morpho butterfly wings and reduces the absorption of W over a broad spectrum. At the initial stage, the impedance mismatch method is implemented to optimize the number and thickness of the homogeneous multilayers over the broadband spectrum. Then, the proposed pattern is incorporated into the homogenous structure. The effect of inhomogeneities on the transverse directions is investigated. The resulting spectral characteristics of both homogeneous and inhomogeneous structures are analyzed by wave impedance analysis. The total optical path was extracted with this analysis. Using this analysis, the mechanisms that trigger sharp reflection dips in homogenous layers are uncovered. S-parameters of the inhomogeneous structures are extracted and evaluated. Our findings indicate that the increased rate of change of the S-parameters phase in inhomogeneous structures is responsible for increased dips over the spectrum.

由在宽带光谱中具有高反射率的热机械优良材料组成的光学涂层最近引起了人们的注意。钨 (W) 以及其他 VIB 族材料非常适合需要高热机械稳定性但反射率低于 1 µm 的应用。本文提出了一种仿生多层结构，可降低钨在宽带光谱上的吸收。拟议的设计模仿了在 Morpho 蝴蝶翅膀上观察到的图案，并减少了 W 在广谱上的吸收。在初始阶段，实施阻抗失配方法以优化宽带光谱上均匀多层的数量和厚度。然后，将提出的模式合并到同质结构中。研究了不均匀性对横向的影响。通过波阻抗分析来分析均匀和非均匀结构的所得光谱特性。通过该分析提取总光路。使用这种分析，可以揭示在同质层中触发急剧反射下降的机制。提取和评估非均匀结构的 S 参数。我们的研究结果表明，不均匀结构中 S 参数相位变化率的增加是导致光谱上倾角增加的原因。揭示了在同质层中触发急剧反射下降的机制。提取和评估非均匀结构的 S 参数。我们的研究结果表明，不均匀结构中 S 参数相位变化率的增加是导致光谱上倾角增加的原因。揭示了在同质层中触发急剧反射下降的机制。提取和评估非均匀结构的 S 参数。我们的研究结果表明，不均匀结构中 S 参数相位变化率的增加是导致光谱上倾角增加的原因。