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Proceedings Paper

Photon sieves and modified Fresnel zone plates
Author(s): Qing Cao; Juergen Jahns
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Paper Abstract

Traditional Fresnel zone plates (TFZPs) can be used for the focusing and imaging of soft X-rays and extreme ultraviolet (EUV) radiations. However, the focal spot size of a TFZP is limited in technology by the minumum feature size (20-40 nm) that can be fabricated by lithography. Recently, a novel diffractive optical element called a photon sieve, which consists of a great number of pinholes properly distributed over the Fresnel zone, was proposed to overcome the resolution problem of a TFZP. Following the initial Nature paper, we have presented the simple individual far-field model for photon sieves and established the general theory for various modified FZPs. Here we present an overview of our research work in these areas. The related contents include the analytical descriptions for the diffracted fields of the individual pinholes and of the individual open rings, the selection conditions for the pinholes and for the open rings, the suppression of sidelobes, the physical limit of the resolution, the suppression of higher-order foci, the construction of a specific focal spot shape like a Gaussian focal spot, the equivalent pupil (or aperture) function theory, the diffraction efficiency, and the fast computation method for the individual diffracted fields. We also discuss the extension of the equivalent pupil function theory to apodized multilevel diffractive lenses.

Paper Details

Date Published: 20 January 2006
PDF: 7 pages
Proc. SPIE 6027, ICO20: Optical Information Processing, 602702 (20 January 2006); doi: 10.1117/12.667697
Show Author Affiliations
Qing Cao, FernUniv. Hagen (Germany)
Juergen Jahns, FernUniv. Hagen (Germany)

Published in SPIE Proceedings Vol. 6027:
ICO20: Optical Information Processing
Yunlong Sheng; Songlin Zhuang; Yimo Zhang, Editor(s)

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