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Opt Express. 2009 Mar 2;17(5):3078-83.

High efficient optical focusing of a zone plate composed of metal/dielectric multilayer.

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Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843-3128,USA.


We numerically investigate the optical field enhancement by a metal/dielectric multilayered zone plate. The optical field enhancement at the focal point of a zone plate originates not only from surface plasmon polaritons (SPPs)-assisted diffraction process along the propagation direction of incident light, but also from multiple scattering and coupling of surface plasmons (SPs) along the metal/dielectric multilayer films. By comparing multilayered zone plates to a conventional monolayered zone plate, we present the effects associated with the number of building blocks and different dielectric materials in the building block on the efficiency of the transmission.

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