Invited Article: Direct phase mapping of broadband Laguerre-Gaussian metasurfaces
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Date
2018-11-01
Authors
Faßbender, Alexander
Babocký, Jiří
Viewegh, Petr
Křápek, Vlastimil
van der Linden, Stefan
0000-0003-3659-9249Advisor
Referee
Mark
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AIP Publishing
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Abstract
We report on the fabrication of metasurface phase plates consisting of gold nanoantenna arrays that generate Laguerre-Gaussian modes from a circularly polarized Gaussian input beam. The corresponding helical phase profiles with radial discontinuities are encoded in the metasurfaces by the orientation of the nanoantennas. A commonpath interferometer is used to determine the orbital angular momentum of the generated beams. Additionally, we employ digital holography to record the detailed phase profiles of the Laguerre-Gaussian modes. This method allows a simple and direct quantitative comparison of the measured phase profiles of the generated Laguerre-Gaussian beams with the theoretically expected phase profiles. Experiments with different laser sources demonstrate the broadband operation of the metasurfaces
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Peer-reviewed
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en