Verhoeven Antonie D, Wyrowski Frank, Turunen Jari
J Opt Soc Am A Opt Image Sci Vis. 2018 Jan 1;35(1):45-54. doi: 10.1364/JOSAA.35.000045.
Diffractive surface relief elements made of lossy materials exhibit phase-dependent absorption, which not only reduces the efficiency but also distorts the signal if the surface profile is realized on the basis of a phase-only design. We introduce an extension of the iterative Fourier transform algorithm, which accounts for such phase-dependent absorption, and present examples of its application to the design of diffractive beam splitters. The operator required for taking absorption into account is chosen to maximize the efficiency of the found design.
由有损材料制成的衍射表面浮雕元件表现出与相位相关的吸收，这不仅会降低效率，而且如果表面轮廓是基于仅相位设计实现的，还会使信号失真。我们引入了迭代傅里叶变换算法的扩展，该扩展考虑了这种与相位相关的吸收，并给出了其在衍射分束器设计中的应用示例。为了使找到的设计效率最大化，选择了考虑吸收所需的算子。
