Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1900713 |
| Journal | Advanced Optical Materials |
| Volume | 7 |
| Issue number | 20 |
| DOIs | |
| State | Published - Jul 30 2019 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFA0701004), the Tianjin Municipal Fund for Distinguished Young Scholars (18JCJQJC45600), and the National Natural Science Foundation of China (NSFC) (Grant Nos. 61775159, 61420106006, 61427814, 61422509, 61735012, and 61505146). Q.X. acknowledges support from the China Scholarship Council (Grant No. 201706250061). Y.-H.X. acknowledges the Guangxi Key Laboratory of Automatic Detecting Technology and Instruments (Grant No. YQ18205). X.-X.Z. acknowledges the financial support of KAUST (Grant No. URF/1/2950).