Abstract
Independently tailoring two or more focused vortex beams and controlling their intensity distributions in one device is indispensable in optical trapping and manipulation fields. We propose the phase equation for a helicity-multiplexing metalens generating dual-focused vortex beams based on the propagation phase and geometry phase. The metalens can independently manipulate dual-focused vortex beams, i.e., their focal lengths, lateral displacements, and topological charges could be independently tailored. Moreover, we can adjust their relative focal intensity by modulating the ellipticity of the incident beam. Such metalenses allow for advanced research and applications in trapping and rotating microparticles.
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