Rough 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...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 49; no. 10; p. 1750
Main Authors Salgado-Remacha, Francisco Javier, Sanchez-Brea, Luis Miguel, Alvarez-Rios, Francisco Javier, Bernabeu, Eusebio
Format Journal Article
LanguageEnglish
Published United States 01.04.2010
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Summary: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.
ISSN:2155-3165
DOI:10.1364/AO.49.001750