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Orbital angular momentum- and frequency-dependent high-capacity encrypted hologram through multi-dimensional
Yong-Qiang Zhou1, Fan Li1, Kai Wu1
1Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, P. R. China.
Nature Communications
|November 27, 2025
Summary
This study introduces a novel acoustic metasurface for high-capacity encrypted holography using orbital angular momentum (OAM) and frequency. This method enables secure, multi-channel sound field reconstruction for advanced acoustic information systems.
Area of Science:
- Acoustics
- Metamaterials
- Holography
Background:
- Sound holography reconstructs complex sound fields but faces capacity and security limitations.
- Existing technologies struggle to meet the demands for high-capacity and secure acoustic information storage and transmission.
Purpose of the Study:
- To propose and demonstrate a high-capacity encrypted hologram mechanism using orbital angular momentum (OAM) and frequency.
- To overcome limitations in capacity and security of current holographic technologies.
Main Methods:
- Development of a multi-dimensional multiplexing acoustic metasurface.
- Customization of metasurface acoustic response using a theoretically-derived transfer function.
- Simultaneous mode and spectrum selectivity for parallel image storage and restoration.
Main Results:
- Experimental demonstration of OAM- and frequency-dependent encrypted holography.
- Achieved high-capacity holographic information storage with double-key security.
- Successful reconstruction of multiple predesigned images using specific OAM mode and wavelength combinations.
Conclusions:
- The proposed methodology enables ultrahigh-capacity holographic information systems in acoustics.
- Offers a new approach for encrypted sound communication with enhanced confidentiality.
- Paves the way for advanced applications in secure acoustic data transmission.
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