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23 January 2006 Sub-wavelength structures for broadband diffractive optics
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Proceedings Volume 6029, ICO20: Materials and Nanostructures; 602919 (2006)
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China
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.
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Mane-Si Laure Lee, Shailendra Bansropun, Odile Huet, Simone Cassette, Brigitte Loiseaux, Andrew Wood, Christophe Sauvan, and Philippe Lalanne "Sub-wavelength structures for broadband diffractive optics", Proc. SPIE 6029, ICO20: Materials and Nanostructures, 602919 (23 January 2006);

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