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Opt Express. 2012 Jul 2;20(14):15516-21. doi: 10.1364/OE.20.015516.

Metallic nanowires can lead to wavelength-scale microlenses and microlens arrays.

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Univ. Grenoble 1 / CNRS, LIPhy UMR 5588, Grenoble, F-38041, France.


We theoretically and experimentally demonstrate that the diffraction of microstructures based on silver nanowires leads to very efficient microfocusing effects. Pairs of parallel nanowires act as ultrasmall cylindrical microlenses with diffraction-limited resolution in the Fresnel region. This is a new diffraction scheme to make micron-sized optical lenses with higher transmittance than plasmonic microlens based on nano-aperture arrays. Calculations based on the scalar Rayleigh-Sommerfeld integral highlights the pure scalar diffractive contribution. Thus, the plasmon contribution is negligible in such micron-sized metallic geometry. We demonstrate that two-dimensional grids of nanowires can be used to fabricate dense arrays of microlenses, i.e. 10000x10000 DPI (dots per inch).


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