A vector optical vortex generated and focused using a metalens
Kotlyar V.V., Nalimov A.G.

 

Image Processing Systems Institute of RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Samara, Russia,
Samara National Research University, Samara, Russia

Full text of article: Russian language.

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Abstract:
Using a FDTD-aided numerical simulation we show that a sharp focal spot can be generated by a spiral metalens made of amorphous silicon, with unit topological charge and unit numerical aperture (NA = 1). The focal spot intensity is nearly round-shaped when using an incident TE-wave, and in the form of a doughnut for an incident TM-wave. We are the first to show theoretically and experimentally that the focal intensity pattern has local regions - located symmetrically or asymmetrically both at the center and on the periphery - where the energy flux is inversely directed. The discovered effect can be used for moving a microparticle in the opposite direction to the light propagation.

Keywords:
zone plate, diffraction grating, optical vortex, metalens.

Citation:
Kotlyar VV, Nalimov AG. A vector optical vortex generated and focused using a metalens. Computer Оptics 2017; 41(5): 645-654. DOI: 10.18287/2412-6179-2017-41-5-645-654.

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