Invited Article: Direct phase mapping of broadband Laguerre-Gaussian metasurfaces
| Autor: | Petr Dvořák, Jiří Babocký, Stefan Linden, Alexander Faßbender, Vlastimil Křápek |
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| Rok vydání: | 2018 |
| Předmět: |
lcsh:Applied optics. Photonics
Angular momentum Computer Networks and Communications Gaussian Gaussian distribution Phase (waves) Physics::Optics 02 engineering and technology 01 natural sciences law.invention 010309 optics symbols.namesake Optics law 0103 physical sciences Broadband Physics Nanoantennas business.industry lcsh:TA1501-1820 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics Interferometry symbols 0210 nano-technology business Beam (structure) Digital holography |
| Zdroj: | APL Photonics, Vol 3, Iss 11, Pp 110803-110803-7 (2018) APL Photonics. 2018, vol. 3, issue 11, p. 110803-1-110803-7. |
| ISSN: | 2378-0967 |
| Popis: | 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 common-path 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. |
| Databáze: | OpenAIRE |
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