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Proceedings Paper

Diffractive nano-focusing and nano-imaging
Author(s): Qing Cao
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Paper Abstract

Diffractive nano-focusing and nano-imaging have many applications in soft X-ray microscopy, spectroscopy, nano-lithography, and in telescope. They can be realized by novel diffractive optical elements of photon sieve and of modified Fresnel zone plates. A photon sieve is composed of a great number of pinholes whose positions and radii are properly chosen. Similarly, a modified Fresnel zone plate is composed of a great number of open rings whose positions and widths are also properly chosen. Recently, an individual far-field model was established to analyse and design a photon sieve. The key point is that the individual diffracted fields of the pinholes have reached their own far fields because the pinholes are very small. Similarly, the individual diffracted fields of the open rings of a modified Fresnel zone plate can be also given in analytical form. Further, we established the equivalent pupil function theory for a general modified Fresnel zone plate. On one hand, one can calculate the focal spot shape of a pre-given modified Fresnel zone plate, and on the other hand, one can design a specific modified Fresnel zone plate to generate a desired focal spot shape.

Paper Details

Date Published: 20 July 2006
PDF: 8 pages
Proc. SPIE 6342, International Optical Design Conference 2006, 634219 (20 July 2006); doi: 10.1117/12.692284
Show Author Affiliations
Qing Cao, FernUniv. Hagen (Germany)

Published in SPIE Proceedings Vol. 6342:
International Optical Design Conference 2006
G. Groot Gregory; Joseph M. Howard; R. John Koshel, Editor(s)

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