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arXiv · 1308.6261

Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates

A. Roszkiewicz·W. Nasalski
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Abstract

Extraordinary optical transmission and good focusing properties of a two-dimensional scattering structure is presented. The structure is made of Fresnel zone plates periodically arranged along two orthogonal directions. Each plate consists of two ring-shaped waveguides supporting modes that match the symmetry of a circularly polarized incident plane wave. High field concentration at the focal plane is obtained with short transverse and long longitudinal foci diameters. Optical vortex excitation in a paraxial region of the transmitted field is also observed and analysed in terms of cross-polarisation coupling. The structure presented may appear useful in visualization, trapping and precise manipulations of nanoparticles.

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A. Roszkiewicz, W. Nasalski. 2013-08-28. Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates. https://doi.org/10.2478/bpasts-2013-0092

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