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Area of Science:

  • Acoustics
  • Metamaterials
  • Information Theory

Background:

  • Structured vortex beams advance multiplexing communication but face challenges in underwater acoustics due to pressure and coupling.
  • Enhancing underwater acoustic information capacity is limited by passive modulation of coaxial beams.

Purpose of the Study:

  • To achieve simultaneous information capacity enhancement and hybrid physical-computational camouflage in underwater acoustic-vortex communication.
  • To develop a pressure-independent system for secure deep-ocean data transfer.

Main Methods:

  • Utilized inverse-designed, free-flooded metasurfaces for hydrostatic stability and wave scattering.
  • Synthesized and demodulated coaxial vortex beams with varying topological charges.
  • Implemented a computational-mask encryption scheme for digital concealment of plaintext images within ciphertext bitstreams.

Main Results:

  • Experimentally realized pressure-independent acoustic-vortex communication.
  • Demonstrated physically encrypted, port-to-port information transfer using synthesized vortex beams.
  • Confirmed physical-computational anti-eavesdropping capabilities through ciphertext transmission.

Conclusions:

  • The developed system offers a novel approach for high-capacity, secure underwater acoustic communication.
  • Metasurface-based acoustic vortex generation and hybrid encryption pave the way for deep-ocean data security.
  • This research enables unprecedented advancements in secure underwater communication technologies.