Terahertz switchable VO₂-Au hybrid active metasurface holographic encryption

Area of Science:

• Optics and Photonics
• Materials Science
• Information Security

Background:

• Metasurface and holographic technologies are advancing rapidly.
• Current metasurface designs are often static, limiting their adaptability after fabrication.
• Dynamic control over metasurfaces is crucial for unlocking their full potential.

Purpose of the Study:

• To propose and demonstrate a switchable hybrid active metasurface hologram in the terahertz (THz) regime.
• To develop a dynamic metasurface capable of displaying information based on external stimuli (temperature).
• To explore the application of this technology in optical communication security via encryption/decryption.

Main Methods:

• Fabrication of a hybrid active metasurface hologram using dynamic vanadium dioxide (VO2-CSRR) and static gold (Au-CSRR) pixels.
• Implementation of an intelligent algorithm to control information display across different temperature ranges.
• Development of an optical information encryption/decryption scheme utilizing metasurfaces and multi-component secret keys.

Main Results:

• Demonstration of a switchable metasurface hologram operating in the THz regime.
• Successful display of partial or complete information by altering temperature, showcasing dynamic control.
• Validation of the proposed encryption/decryption scheme with high security levels.

Conclusions:

• The developed switchable hybrid active metasurface hologram offers dynamic control and adaptability.
• This technology shows significant potential for enhancing optical communication security through novel encryption methods.
• The findings present a new pathway for secure information transmission using metasurfaces.