Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900713
Keywords
coupled-mode theory; metasurfaces; spin-to-orbital angular momentum conversion; surface plasmons
Categories
Funding
- National Key Research and Development Program of China [2017YFA0701004]
- Tianjin Municipal Fund for Distinguished Young Scholars [18JCJQJC45600]
- National Natural Science Foundation of China (NSFC) [61775159, 61420106006, 61427814, 61422509, 61735012, 61505146]
- China Scholarship Council [201706250061]
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments [YQ18205]
- KAUST [URF/1/2950]
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Orbital angular momentum (OAM) has been recently introduced to plasmonics for generating plasmonic vortices with a helical wavefront, opening avenues for exotic on-chip applications such as quantum information processing and communications. In previous demonstrations, carefully designed optical elements are used to convert left- and right-circular polarizations into plasmonic vortices with different topological charges, resulting in conversion from optical spin angular momentum (SAM) to plasmonic OAM. Here, it is demonstrated theoretically and experimentally that by utilizing the near-field coupling between paired resonators in a metasurface, selective conversion from optical SAM to plasmonic OAM is realized, where generation of plasmonic vortices can be achieved for incident light of one circular polarization while significantly suppressed for the other circular polarization. The proposed design scheme may motivate the design and fabrication of future practical plasmonic devices.
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