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Enhanced light extraction through randomly nano-textured interfaces

机译：通过随机的纳米纹理界面增强光提取

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The use of micro-structured interfaces has been shown to increase the extracted light portion far beyond the total reflection cone that limits extraction from flat surfaces. However, earlier theoretical treatments based on ray tracing, break down for nano-structured features smaller than the material wavelength. We apply a new analytic method converting the boundary conditions at the interface into surface currents following from the surface discontinuity in the perpendicular electric and parallel displacement vectors. These currents serve as source terms driving the transmitted radiation, computed by applying the full wave propagator. Analytic formulae yield the transmitted fraction for quasi-periodic surface features involving random variation of the feature size and period. A single incidence of an incoming plane wavefront suffices for transmission, while, in the ray tracing approach, many bounces with an opposing surface are required until the randomly changing angle of incidence falls within the extraction cone.
机译：已经证明，使用微结构化界面可以使提取的光部分增加到远远超过限制从平面提取的全反射锥范围。但是，较早的基于射线追踪的理论处理方法对于小于材料波长的纳米结构特征无法发挥作用。我们应用一种新的解析方法，将界面处的边界条件转换为表面电流，这是根据垂直电和平行位移矢量中的表面不连续性进行的。这些电流用作驱动透射辐射的源项，通过应用全波传播器计算得出。解析公式得出准周期性表面特征的透射分数，其中涉及特征尺寸和周期的随机变化。入射平面波前的单次入射就足以传输，而在射线跟踪方法中，需要许多具有相对表面的反弹，直到入射角的随机变化落在提取锥内。

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