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Area-coded effective medium structures, a new type of grating design

机译:区域代码有效的介质结构,一种新型的光栅设计

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We propose a new way to design gratings with desired diffraction properties by using subwavelength feature sizes perpendicular to the ordinary superwavelength grating period. This is different from well-known one-dimensional binary-blazed gratings that use a structuring along the grating period and thus opens new flexibility in generating arbitrary effective-index distributions in the direction of the grating period. Since the subwavelength features form contiguous areas, they are called area-coded effective medium structures (ACES). Compared with well-known binary subwavelength structures in two-dimensional arrangements consisting of pillars, ACES are more stable and have comparable efficiency properties. As an example we show how to design in principle a four-level area-coded effective medium grating, compare the efficiency of ACES with binary-blazed and echelette gratings, and optimize the subwavelength period of ACES.
机译:我们提出了一种通过使用垂直于普通超波长光栅周期的亚波长特征尺寸来设计具有所需衍射特性的光栅的新方法。这与使用沿光栅周期的结构的公知的一维二进制闪耀光栅不同,因此为在光栅周期的方向上生成任意有效折射率分布打开了新的灵活性。由于亚波长特征形成连续的区域,因此它们被称为区域编码有效介质结构(ACES)。与公知的由柱子组成的二维排列的二元亚波长结构相比,ACES更稳定并且具有相当的效率特性。作为示例,我们展示了如何原则上设计四级区域编码有效介质光栅,比较ACES与二元闪耀和小阶梯光栅的效率,以及优化ACES的亚波长周期。

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