2012/01/02 by Patrice Genevet, Nanfang Yu, Francesco Aieta +6 · 3 citations
Physics and Astronomy · Engineering · #Orbital Angular Momentum in Optics #Plasmonic and Surface Plasmon Research #Near-Field Optical Microscopy
paper · doi:10.1063/1.3673334
openalex publication_date 2012/01/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.