Exploiting the combined dynamic and geometric phases for optical vortex beam generation using metasurfaces.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Metasurfaces enable optical vortex beam generation via dynamic or geometric phases.
• Dynamic phase designs are polarization-independent, while geometric phase designs are polarization-dependent.

Purpose of the Study:

• To investigate the potential of combining dynamic and geometric phases in metasurface design for optical vortex generation.
• To achieve tunable functional control over light polarization in metasurface-based vortex generation.

Main Methods:

• Proposing a hybrid metasurface design integrating both dynamic and geometric phases.
• Establishing a correlation between metasurface structural parameters and the topological charge of generated vortices.
• Experimental validation of the hybrid design's performance and polarization control capabilities.

Main Results:

• The hybrid metasurface design successfully generates optical vortex beams.
• The design provides tunable functional control over the polarization of light.
• Experimental results confirm the design's flexibility and effective polarization control.

Conclusions:

• Combining dynamic and geometric phases in metasurfaces offers a novel approach for optical vortex generation.
• This hybrid phase manipulation allows for precise control over polarization constraints.
• The findings hold significant potential for designing advanced optical devices and applications.