Cao Qing, Jahns Jürgen
Optische Nachrichtentechnik, FernUniversität Hagen, Universitätsstrasse 27/PRG, 58084 Hagen, Germany.
J Opt Soc Am A Opt Image Sci Vis. 2006 Jan;23(1):179-86. doi: 10.1364/josaa.23.000179.
An apodized, multilevel diffractive lens that can produce a desired diffraction-limited focal spot is proposed for many applications, such as focusing, imaging, optical storage, and optical trapping. The three key points for the design are the innovative idea of complex conjugate subzones, the use of Babinet's principle, and the equivalent-pupil (or aperture) function theory of diffractive focusing elements composed of concentric transparent rings. As a concrete example, we numerically design a mixed multilevel diffractive lens (the highest phase level is 8) to produce a diffraction-limited Gaussian focal spot. Some related problems, such as the validity range and the combination with high-numerical-aperture refractive lenses, are also discussed.
提出了一种变迹多层衍射透镜，它能够产生所需的衍射极限焦斑，可用于多种应用，如聚焦、成像、光存储和光捕获。该设计的三个关键点是复共轭子区域的创新理念、巴比涅原理的应用以及由同心透明环组成的衍射聚焦元件的等效光瞳（或孔径）函数理论。作为一个具体例子，我们数值设计了一个混合多层衍射透镜（最高相位级为8）以产生衍射极限高斯焦斑。还讨论了一些相关问题，如有效范围以及与高数值孔径折射透镜的组合。
