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Hybrid refractive–diffractive–gradient-index superresolving focusing device

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Abstract

The focusing properties and resolving power of a device consisting of a tapered gradient-index (GRIN) lens with spherical input and output faces are investigated through the use of the ABCD formalism to achieve minimization of the Airy radius for the device. Diffractive elements, such as zone plates, can, with an appropriate choice of their parameters, increase the resolution of an imaging system compared with a conventional lens. We demonstrate that by combining both elements a hybrid refractive–diffractive–GRIN device can be designed that exhibits improved superresolution characteristics.

© 2008 Optical Society of America

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