Publication: Rough Fresnel zone plates over metallic surfaces
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2010-04-01
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The Optical Society Of America
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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 simulations by means of the Rayleigh–Sommerfeld approach, showing how roughness in both levels of the Fresnel zone plate affects the focalization of the lens. We also manufacture Fresnel zone plates over steel tape, and perform experimental verification that corroborates the numerical results.
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© 2010 Optical Society of America.
The authors are grateful to Francisco José Torcal Milla for his help. This work has been partially supported by project CCG08-UCM/DPI-3952 of Dirección General de Universidades e Investigación de la Consejería de Educación de la Comunidad de Madrid y Universidad Complutense de Madrid and project DPI2008-02391 of Ministerio de Ciencia e Innovación. Salgado-Remacha acknowledges the economical support of the Ministerio de Ciencia e Innovación.
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