Metasurface-enabled grafted perfect vector vortex beams with trigonometric-function topological charges for...

Area of Science:

• Advanced photonics research
• Optical physics
• Metasurface applications

Background:

• Perfect vector vortex beams (PVVBs) are crucial in advanced photonics due to unique polarization and vortex properties.
• Current methods for generating PVVBs are limited by static topological charge (TC) and restricted information encryption capabilities.

Purpose of the Study:

• To introduce a novel metasurface-based method for generating grafted perfect vector vortex beams (GPVVBs).
• To enable continuously tunable topological charges (TCs) and customizable field distributions.
• To enhance information encryption capacity in optical systems.

Main Methods:

• Utilized trigonometric-function topological engineering on a metasurface.
• Employed computational analysis to correlate rotation angle with tunable TCs.
• Demonstrated dynamic adjustment of fractional-order beams via polarizer rotation.

Main Results:

• Successfully generated grafted perfect vector vortex beams (GPVVBs) with continuously tunable TCs.
• Achieved customizable beam field distributions by adjusting fractional beam orders.
• Significantly enhanced information encryption capacity in multichannel optical encryption systems.

Conclusions:

• The developed metasurface method offers unprecedented flexibility in generating and controlling PVVBs.
• GPVVBs hold transformative potential for advanced optical encryption and high-density optical communications.