2011•Optics ExpressOpen access
A broadband zone plate lens from transformation optics
Rui Yang, Wenxuan Tang, Yang Hao
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Abstract
A zone plate lens utilizing a refractive instead of diffractive approach is presented for broadband operation. By utilizing transformation optics, we compress the conventional hyperbolic lens into a flat one with a few zone plates made of all-dielectric materials. Such a transformed lens maintains the broadband performance of the original lens, thus providing a superior alternative to the diffractive Fresnel element which is inherently narrow band.