Invited Article: Direct phase mapping of broadband Laguerre-Gaussian metasurfaces

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Date
2018-11-01
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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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Citation
APL Photonics. 2018, vol. 3, issue 11, p. 110803-1-110803-7.
http://dx.doi.org/10.1063/1.5049368
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Peer-reviewed
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en
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Defence
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Creative Commons Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
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