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Antireflection gratings for a photonic-crystal flat lens

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Abstract

A dielectric structure with effective permittivity and permeability close to 1 operating for propagative waves at optical wavelengths is proposed. This structure is a two-dimensional photonic crystal with refractive index 1, coated by appropriate antireflection gratings. Numerical simulations involving a flat lens made of this optimized crystal illustrate the improvements that antireflection gratings can bring. In particular, following Veselago’s proposition, this lens “can focus at a point the radiation from a point source” with negligible reflection losses. The proposed design takes into account the fabrication requirements and can be used for optical devices integrated in planar waveguides.

© 2009 Optical Society of America

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