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Rough Fresnel zone plates over metallic surfaces
Francisco Javier Salgado-Remacha1, Luis Miguel Sanchez-Brea, Francisco Javier Alvarez-Rios
1Applied Optics Complutense Group, Optics Department, Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Ciudad Universitaria s.n., 28040 Madrid, Spain. fjsalgado@fis.ucm.es
Applied Optics
|April 2, 2010
Summary
We explored Fresnel zone plates on steel tape for micro-optics. Anisotropic roughness from laser ablation impacts focusing, confirmed by simulations and experiments.
Area of Science:
- Optics and Photonics
- Materials Science
- Microfabrication
Background:
- Conventional chrome-glass micro-optical elements have limitations.
- Steel tapes offer a potential substrate for micro-optical elements.
- Laser ablation is used for fabricating micro-optical elements on steel tapes.
Purpose of the Study:
- To analyze the focusing properties of Fresnel zone plates fabricated on steel tapes.
- To investigate the impact of anisotropic surface roughness on focusing performance.
- To assess the feasibility of using steel tape-based Fresnel zone plates as an alternative to conventional elements.
Main Methods:
- Numerical simulations using the Rayleigh-Sommerfeld approach to model the effect of roughness.
- Fabrication of Fresnel zone plates on steel tape via laser ablation.
- Experimental verification of focusing properties.
Main Results:
- Anisotropic surface roughness significantly reduces the focusing properties of Fresnel zone plates.
- Numerical simulations accurately predicted the impact of roughness on focalization.
- Experimental results corroborated the findings from numerical simulations.
Conclusions:
- Fresnel zone plates fabricated on steel tape show potential for micro-optical applications.
- Surface roughness is a critical factor affecting the performance of these elements.
- Further optimization of the fabrication process is needed to mitigate roughness effects.
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