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Toward the subdiffraction focusing limit of optical superresolution

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Abstract

A superresolving three-zone plate is applied to a Fresnel diffractive lens. It is shown that for radial incident polarization this combination produces a focal spot approaching superresolution allowed subdiffractive limit of 0.36λNA for focusing. For media responsive to longitudinal field component only, our phase engineering scheme results in a focal spot size of 0.368λNA. When used with a solid immersion lens, the scheme can generate the smallest focal spot available for passive optics.

© 2007 Optical Society of America

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