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arXiv · 1902.02667

Freestanding metasurfaces for optical frequencies

M. Prämassing·T. Leuteritz·A. Faßbender·H. J. Schill·S. Irsen·S. Linden
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Abstract

We present freestanding metasurfaces operating at optical frequencies with a total thickness of only 40$\,$nm. The metasurfaces are fabricated by focused ion beam milling of nanovoids in a carbon film followed by thermal evaporation of gold and plasma ashing of the carbon film. As a first example, we demonstrate a metasurface lens based on resonant V-shaped nanovoids with a focal length of 1$\,$mm. The second example is a metasurface phase-plate consisting of appropriately oriented rectangular nanovoids that transforms a Gaussian input beam into a Laguerre-Gaussian ${LG_{-1,0}}$ mode.

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M. Prämassing, T. Leuteritz, A. Faßbender, H. J. Schill, S. Irsen, S. Linden. 2019-02-07. Freestanding metasurfaces for optical frequencies. https://doi.org/10.1364/ol.44.002105

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