A vector optical vortex generated and focused using a metalens
Автор: Kotlyar Victor Victorovich, Nalimov Anton Gennadyevich
Журнал: Компьютерная оптика @computer-optics
Рубрика: Дифракционная оптика, оптические технологии
Статья в выпуске: 5 т.41, 2017 года.
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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.
Zone plate, diffraction grating, optical vortex, metalens
Короткий адрес: https://sciup.org/140228656
IDR: 140228656 | DOI: 10.18287/2412-6179-2017-41-5-645-654