Dielectric multi-momentum meta-transformer in the visible

Area of Science:

• Nanophotonics and Metasurfaces
• Optical Engineering

Background:

• Metasurfaces offer multi-functionality for next-generation nano-devices.
• Current multi-tasked metasurfaces often rely on complex designs or incident beams for information encoding.

Purpose of the Study:

• To propose and demonstrate a novel multi-momentum transformation metasurface (meta-transformer).
• To synergize intrinsic light properties (OAM and LM) with metasurface phase profiles for advanced optical manipulation.

Main Methods:

• Designed and fabricated a metasurface capable of transforming multiple light momenta.
• Utilized the metasurface to reconstruct different orbital angular momentum (OAM) beams into distinct on-axis patterns.
• Demonstrated linear momentum (LM) transformation for color conversions and holographic imaging.

Main Results:

• The OAM meta-transformer successfully reconstructed various topologically charged beams into distinct on-axis patterns.
• The LM meta-transformer converted red, green, and blue light into "R", "G", and "B" images and vivid color holograms.
• Showcased the potential for ultra-compact meta-transformers through light-metasurface phase combinations.

Conclusions:

• The developed meta-transformer offers a new paradigm for multi-functional optical devices.
• This technology has significant potential applications in information storage, nanophotonics, optical integration, and optical encryption.