Journal
NANO LETTERS
Volume 20, Issue 9, Pages 6774-6779Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02699
Keywords
Plasmonic vortex; surface plasmon polaritons; plasmonic vortex lenses; spin-to-orbit coupling; orbital angular momentum
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Funding
- National Natural Science Foundation of China [11874102]
- Sichuan Province Science and Technology Support Program [2020JDRC0006]
- Fundamental Research Funds for the Central Universities [ZYGX2019J102]
- National Research Foundation, Prime Minister's Office, Singapore [NRF CRP22-2019-0006]
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The optical vortex on a chip is of extreme importance for many applications in nanoscience, and as well-known, the chiral metallic nanostructures like plasmonic vortex lenses (PVLs) can produce a spin-dependent plasmonic vortex (PV) which is governed by plasmonic spin-orbit coupling. The well-established nanophotonic theory and various experimental demonstrations all show a single PV mode in one PVL, when the excitation is fixed. Here, counterintuitively, we report the existence of the nontrivial deuterogenic PVs, besides the one predicted previously. We theoretically reveal a general spin-to-orbit coupling and experimentally demonstrate the surprising existence of multiple PVs in a single PVL even when excited by a fixed circularly polarized vortex beam. This work provides a deeper fundamental understanding of the dynamics and the near-field spin-orbit coupling in nanophotonics, which promises to flexibly manipulate the PV for emerging optical vortex-based nanotechnologies and quantum optical applications on a chip.
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