A flat optical device that generates optical vortices with a variety of topological charges is demonstrated. This device spatially modulates light beams over a distance much smaller than the wavelength in the direction of propagation by means of an array of V-shaped plasmonic antennas with sub-wavelength separation. Optical vortices are shown to develop after a sub-wavelength propagation distance from the array, a feature that has major potential implications for integrated optics.
Ultra-thin plasmonic optical vortex plate based on phase discontinuities
Patrice Genevet, Nanfang Yu, Francesco Aieta, Jiao Lin, Mikhail A. Kats, Romain Blanchard, Marlan O. Scully, Zeno Gaburro, Federico Capasso; Ultra-thin plasmonic optical vortex plate based on phase discontinuities. Appl. Phys. Lett. 2 January 2012; 100 (1): 013101. https://doi.org/10.1063/1.3673334
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