光散射对高性能纳米结构减反射表面的重要性
On the importance of light scattering for high performances nanostructured antireflective surfaces
摘要：
呈现连续折射率梯度的抗反射涂层理论上优于其离散对应物，因为它可以产生完美的宽带透明性。这种表面处理可以通过类似蛾眼的纳米结构获得。尽管必须考虑光散射行为，因为它可能导致显著的透射率下降，但实际上没有方法可用于预测这种纳米结构抗反射涂层中的散射损失。为了克服这种电流限制，我们在这里提出了一种新颖的方法来模拟这些系统和路由中的散射损耗，以优化透明度。通过对呈现离散或连续梯度折射率的涂层的比较研究验证了该方法，该方法表明，通过斜角沉积制成的离散抗反射涂层双层允许在宽带[400-1800] nm上达到98.97%的超高平均透射率。这种简单的表面处理优于蛾眼架构由于干涉效应和小尺寸的纳米结构，最大限度地减少散射损失，证实了从电子断层扫描实验获得的重建体积上进行的有限差分时域模拟。
英文摘要：
An antireflective coating presenting a continuous refractive index gradient is theoretically better than its discrete counterpart because it can give rise to a perfect broadband transparency. This kind of surface treatment can be obtained with nanostructures like moth-eye. Despite the light scattering behavior must be accounted as it can lead to a significant transmittance drop, no methods are actually available to anticipate scattering losses in such nanostructured antireflective coatings. To overcome this current limitation, we present here an original way to simulate the scattering losses in these systems and routes to optimize the transparency. This method, which was validated by a comparative study of coatings presenting refractive indices with either discrete or continuous gradient, shows that a discrete antireflective coating bilayer made by oblique angle deposition allows reaching ultra-high mean transmittance of 98.97% over the broadband [400-1800] nm. Such simple surface treatment outperforms moth-eye architectures thanks to both interference effect and small dimensions nanostructures that minimize the scattering losses as confirmed by finite-difference time domain simulations performed on reconstructed volumes obtained from electron tomography experiments.
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