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Proceedings Paper

Sub-wavelength structures for broadband diffractive optics
Author(s): Mane-Si Laure Lee; Shailendra Bansropun; Odile Huet; Simone Cassette; Brigitte Loiseaux; Andrew Wood; Christophe Sauvan; Philippe Lalanne
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Paper Abstract

Diffractive optical elements in the form of surface-relief 'blaze' (echelette-type) structures diamond-turned onto the surface of conventional refractive lens elements are well-established and widely used. However, they suffer from limited broadband diffraction efficiency, which prevents the full benefits of hybrid optics from being realised. A family of diffractive optics, the blazed-binary optical element, is investigated to improve the broadband efficiency. Blazed-binary optical elements are diffractive components, composed of subwavelength (ie. with size smaller than the wavelength) ridges, pillars or other simple geometries carefully etched in a dielectric film, that mimic standard blazed-echelette diffractive elements. Their operation exploits effective-medium theory. We show that by exploiting the high dispersion of artificial material, diffractive optical elements which are blazed over a broad spectral range can be synthesized. A blazed-binary grating is designed to validate the broadband behaviour and practical aspects are investigated through the manufacture of sub-wavelength structures in a Gallium Arsenide substrate.

Paper Details

Date Published: 23 January 2006
PDF: 7 pages
Proc. SPIE 6029, ICO20: Materials and Nanostructures, 602919 (23 January 2006); doi: 10.1117/12.667742
Show Author Affiliations
Mane-Si Laure Lee, Thales Research and Technology (France)
Shailendra Bansropun, Thales Research and Technology (France)
Odile Huet, Thales Research and Technology (France)
Simone Cassette, Thales Research and Technology (France)
Brigitte Loiseaux, Thales Research and Technology (France)
Andrew Wood, Thales Optics Ltd. (United Kingdom)
Christophe Sauvan, Lab. Charles Fabry de l'Institut d'Optique, CNRS (France)
Philippe Lalanne, Lab. Charles Fabry de l'Institut d'Optique, CNRS (France)

Published in SPIE Proceedings Vol. 6029:
ICO20: Materials and Nanostructures
Wei Lu; Jeff Young, Editor(s)

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