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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 27, Iss. 7 — Jul. 1, 2010
  • pp: 1647–1654

Cascades of π-phase plates: a transparent diffractive focusing system

Emmanuel Cagniot, Michael Fromager, Thomas Godin, Mohamed Traïche, Nicolas Passilly, Birgit Päivänranta, and Kamel Ait-Ameur  »View Author Affiliations

JOSA A, Vol. 27, Issue 7, pp. 1647-1654 (2010)

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Typically, refractive lenses are used to focus rays of light, but an alternative way can be found by exploiting diffraction of light. It is well known that cascades of hard-edge apertures are able to focus light but with the great drawback of absorption losses. In this paper, we demonstrate that replacing hard-edge apertures with π-phase plates within a cascade greatly improves the focusing of collimated Gaussian beams. In addition, we propose a simple model to design this cascade, in particular to find the locations and the radii of the different optics once the focal length has been chosen. This model deduced from numerical simulation is useful for sizing cascades consisting of a high number of components and characterized by a strong focusing ability, without requiring a time-consuming optimization process.

© 2010 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1380) Diffraction and gratings : Binary optics
(050.5080) Diffraction and gratings : Phase shift

ToC Category:
Diffraction and Gratings

Original Manuscript: February 1, 2010
Revised Manuscript: May 4, 2010
Manuscript Accepted: May 19, 2010
Published: June 18, 2010

Emmanuel Cagniot, Michael Fromager, Thomas Godin, Mohamed Traïche, Nicolas Passilly, Birgit Päivänranta, and Kamel Ait-Ameur, "Cascades of π-phase plates: a transparent diffractive focusing system," J. Opt. Soc. Am. A 27, 1647-1654 (2010)

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