Design of a vortex metalens with high focusing efficiency using propagation phase.
Appl Opt
; 61(21): 6311-6315, 2022 Jul 20.
Article
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| MEDLINE
| ID: mdl-36256245
ABSTRACT
Three vortex-focused beams are produced with linearly polarized light along the x or y axis at a wavelength of 1550 nm. First, a polarization-independent vortex metalens with a topological charge of three and focal length of 3000 nm is designed by selecting cylindrical-shaped elements. This design has a focusing efficiency of 83%. Second, vortex beams with different focal lengths and topological charges are achieved by combining various shapes of structures. Both designs have a focusing efficiency of greater than 92%. The designed metasurface is of great significance to optical communication and radar detection.
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2022
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