Abstract
We demonstrate orbital angular momentum (OAM) transfer by chiral plasmonic nanostructures designed on both sides of a thin suspended metallic membrane. We show how far-field vortex beams with tunable OAM indices can be tailored through nanostructure designs. We reveal the crucial role played by the central aperture that connects the two sides of the membrane from which OAM selection rules are derived in perfect agreement with experimental data.
- Received 5 December 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.203906
© 2013 American Physical Society
Synopsis
Nanostructures Put a Spin on Light
Published 16 May 2013
Plasmonic nanostructures can be used to generate optical vortices with varying amounts of angular momentum.
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