Orbital angular momentum multiplexing holography based on multiple polarization channel metasurface.

Area of Science:

• Optics and Photonics
• Information Technology
• Materials Science

Background:

• Metasurfaces offer high-dimensional control of electromagnetic waves, crucial for high-capacity information technology.
• Existing multiplexing techniques (polarization, angle, wavelength, OAM) face limitations due to metasurface resolution and size.
• Combining Orbital Angular Momentum (OAM) multiplexing with polarization offers a promising avenue for enhanced holographic capabilities.

Purpose of the Study:

• To propose and experimentally demonstrate a metasurface holography multiplexing scheme integrating multiple polarization channels with OAM.
• To leverage the orthogonal independence of spin and orbital angular momentum for constructing multiple OAM holograms.
• To develop a high-capacity and high-security optical communication framework using multiplexing metasurfaces.

Main Methods:

• Designed and fabricated a metasurface capable of manipulating electromagnetic waves.
• Implemented a multiplexing scheme combining Orbital Angular Momentum (OAM) and polarization degrees of freedom.
• Constructed multiple OAM multiplexing holograms across different spin-polarization channels.

Main Results:

• Successfully integrated two multiplane holograms and 15 OAM multiplexing holograms onto a single metasurface.
• Demonstrated the compatibility of OAM multiplexing and polarization multiplexing for enhanced holographic performance.
• Introduced an optical nested encryption framework for parallel communication.

Conclusions:

• The proposed metasurface holography scheme significantly enhances holographic data capacity and security.
• This work provides innovative design concepts for optical communication, information encryption, and related fields.
• The integration of OAM and polarization multiplexing on metasurfaces paves the way for next-generation optical technologies.