Wen Xin, Lenef Alan, Qian Yiming, Klotzkin David
Appl Opt. 2019 Oct 1;58(28):7684-7687. doi: 10.1364/AO.58.007684.
Bragg pairs are used as fundamental units to realize optimized thin-film structures. This method is efficient in designing for a large number of layers, such as in a bandpass filter or an edge filter with a relatively wide stopband or angular range. It adapts readily to conventional optimization methodology (such as genetic algorithms). In this paper, the method is first illustrated by application to a conventional high-pass coating on glass, using one set of Bragg pair materials. This demonstrated a 10% improvement over an alternative design technique. A second example is demonstrated using two sets of Bragg pair materials, designed with a more complex merit function, to increase the reflectance around the Brewster angle for p-polarized light. This demonstrated a 19% average reflection improvement across the stopband compared to a two-material design.
布拉格对被用作实现优化薄膜结构的基本单元。这种方法在设计大量层数时很有效，例如在具有相对宽阻带或角度范围的带通滤波器或边缘滤波器中。它很容易适应传统的优化方法（如遗传算法）。在本文中，该方法首先通过应用于玻璃上的传统高通涂层进行说明，使用一组布拉格对材料。这表明与另一种设计技术相比有10%的改进。第二个例子是使用两组布拉格对材料进行演示，采用更复杂的品质因数函数进行设计，以增加p偏振光在布儒斯特角附近的反射率。与双材料设计相比，这表明在整个阻带中平均反射率提高了19%。
