Spatial Frequency Multiplexed Meta-Holography and Meta-Nanoprinting

Area of Science:

• Optics and Photonics
• Materials Science
• Information Technology

Background:

• Metasurfaces offer control over optical wave properties like phase and polarization.
• Existing metasurface multiplexing primarily utilizes spatial domains.
• A need exists for advanced multiplexing techniques to increase information capacity.

Purpose of the Study:

• To demonstrate metasurface multiplexing using the spatial frequency domain.
• To enable the storage and retrieval of multiple independent holographic images on a single metasurface.
• To explore novel applications in optical information technologies.

Main Methods:

• Fabrication of a single metasurface hologram (meta-hologram).
• Encoding two independent holographic images at distinct spatial frequencies (high and low).
• Utilizing digital Gaussian filters for demultiplexing the recorded images.
• Demonstrating meta-nanoprinting for complex image multiplexing.

Main Results:

• Successful overlapping and recording of two independent holographic images onto one meta-hologram.
• High-fidelity separation of the multiplexed holographic images using digital filters.
• Demonstration of spatial frequency multiplexing with meta-nanoprinting for complex images (cat and dog).

Conclusions:

• Metasurface spatial frequency multiplexing significantly increases information channel capacity.
• This technique provides a novel route for optical information encoding, storage, and security.
• Potential applications include compact displays and advanced information hiding systems.