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arXiv 0811.0343physics.optics
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分形广义波带片

Fractal Generalized Zone Plates

Omel Mendoza-Yero, Mercedes Fernandez-Alonso, Gladys Minguez-Vega, Jesus Lancis, Vicent Climent, Juan A. Monsoriu

摘要:

提出了利用一组具有圆对称性的周期衍射光学元件构造分形广义波带片的方法。这使我们能够增加传统分形波带片(FraZP)的焦点数量,保持轴向辐照度内的自相似性。这些分形衍射光学元件的聚焦特性,不仅沿,而且在光轴附近的点进行了研究。在这两种情况下,解析表达式的辐照度。对平面波照明下FraGZPs的能量效率进行了数值模拟。此外,还讨论了透明环面积变化对轴向辐照度的影响。

英文摘要:

The construction of fractal generalized zone plates (FraGZPs) from a set of periodic diffractive optical elements with circular symmetry is proposed. This allows us to increase the number of foci of a conventional fractal zone plate (FraZP), keeping the self-similarity property within the axial irradiance. The focusing properties of these fractal diffractive optical elements for points not only along but also in the close vicinity of the optical axis are investigated. In both cases analytical expressions for the irradiance are derived. Numerical simulations of the energetic efficiency of FraGZPs under plane wave illumination are carried out. In addition, some effects on the axial irradiance caused by the variation in area of their transparent rings are shown.

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