Visible-frequency Metasurface for Structuring and Spatially Multiplexing Optical Vortices
Journal article published in 2015 by
Muhammad Qasim Mehmood,
Shengtao Mei,
Sajid Hussain,
S. Y. Siew,
Lei Zhang,
Tianhang Zhang,
Xiaohui Ling,
Hong Liu,
Jinghua Teng,
Shuang Zhang,
Cheng-Wei Qiu,
Kun Huang 
,
Aaron Danner
,
Aaron Danner
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Abstract
A multifocus optical vortex metalens, with enhanced signal-to-noise ratio, is presented that focuses three longitudinal vortices with distinct topological charges at different focal planes. The design largely extends the flexibility of tuning the number of vortices and their focal positions for circularly polarized light in a compact device, which provides the convenience for nanomanipulation of optical vortex.