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High efficiency focusing vortex generation and detection with polarization-insensitive dielectric metasurfaces

Nanoscale2018Vol. 10(40), pp. 19154–19161

Citations Over TimeTop 10% of 2018 papers

Kai Ou, Guanhai Li, Tianxin Li, Hui Yang, Feilong Yu, Jin Chen, Zengyue Zhao, Guangtao Cao, Xiaohong Chen, Wei Lü

Abstract

The optical vortex beam with an orbital angular momentum, featuring a doughnut intensity distribution and a helically structured wavefront, has received extensive attention due to its applications in nanoparticle manipulation and optical communications. In this paper, we propose high-efficiency polarization-independent vortex beam generators which are capable of transforming the arbitrarily polarized plane wave into a focusing optical vortex beam and an abruptly focusing airy vortex beam. Besides, based on holographic metasurfaces, we provide a general design scheme for detecting the topological charges. With such a design strategy, multichannel topological charge resolved devices are demonstrated, which successfully implement the detection of the topological charges from -2 to 2. The metasurfaces designed with a simple and effective method in light manipulation promise photonic applications in secure communications and other related areas.

Citations Over TimeTop 10% of 2018 papers

Abstract

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