Cantor dust zone plates
نویسندگان
چکیده
منابع مشابه
Fractal Zone Plates for X-ray Microscopy
Fresnel zone plates are diffractive elements that are essential to form images in X-ray microscopy[1,2]. One of the main shortcomings of Fresnel zone plates their high chromatic aberration. Recently presented, Fractal Zone Plates (FZPs) [3] are diffractive lenses characterized by a fractal focal structure with an extended focal depth, as compared with Fresnel lenses. This behaviour predicts an ...
متن کاملOptimization of modified volume Fresnel zone plates.
Modified volume Fresnel zone plates (MVFZPs) fabricated with laser direct writing were optimized for higher diffraction efficiencies. The Fresnel radii in each layer of a volume zone plate were iteratively adjusted by a simulation-based direct search optimization. The results show that optimization is effective but depends strongly on the starting diffraction efficiencies determined by the MVFZ...
متن کاملWhite-light imaging with fractal zone plates.
We report the achievement of the first images to our knowledge obtained with a fractal zone plates (FraZPs). FraZPs are diffractive lenses characterized by the fractal structure of their foci. This property predicts an improved performance of FraZPs as image forming devices with an extended depth of field and predicts a reduced chromatic aberration under white-light illumination. These theoreti...
متن کاملHard-X-ray Zone Plates: Recent Progress
The technology to focus hard-X-rays (photon energy larger than 1–2 keV) has made great progress in the past three years. The progress was particularly spectacular for lenses based on the Fresnel zone plate concept. The spatial resolution notably increased by a factor of three, opening up entirely new domains of application, specifically in biomedical research. As we shall see, this evolution is...
متن کاملRough Fresnel zone plates over metallic surfaces.
We analyze the focusing properties of Fresnel zone plates fabricated over steel tapes using laser ablation. Our intention is to implement the use of micro-optical elements when the use of conventional chrome-glass elements is not indicated. Because of the manufacture process, the surface presents a certain anisotropic roughness, which reduces the focusing properties. First, we develop numerical...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2013
ISSN: 1094-4087
DOI: 10.1364/oe.21.002701