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Proceedings Paper

Lens-free focusing of Gaussian beams
Author(s): Gabrielle Thériault; Réal Tremblay; Nathalie McCarthy
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Paper Abstract

This paper studies the diffraction in the near-field of a monochromatic Gaussian beam by a sequence of parallel coaxial circular apertures. A method to design diffraction-based and wavelength-specific focusing systems through a sequence of circular apertures, using confocal Fresnel ellipsoids, is detailed. The results obtained with this research show that the design method introduced here is valid and can be used to focus electromagnetic beams without traditional refractive lenses.

Paper Details

Date Published: 12 August 2008
PDF: 6 pages
Proc. SPIE 7099, Photonics North 2008, 70991J (12 August 2008); doi: 10.1117/12.806611
Show Author Affiliations
Gabrielle Thériault, Ctr. d'Optique, Photonique et Laser, Univ. Laval (Canada)
Réal Tremblay, Ctr. d'Optique, Photonique et Laser, Univ. Laval (Canada)
Nathalie McCarthy, Ctr. d'Optique, Photonique et Laser, Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 7099:
Photonics North 2008

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