Terahertz metasurface encryption based on phase change-controlled magnetic resonance quenching
Abstract
We present a terahertz encryption metasurface enabled by the phase-change material Ge 2 Sb 2 Te 5 (GST). A plasmon-induced transparency (PIT) response is formed by bright–dark mode coupling, and switching GST between amorphous and crystalline states modulates transmission by quenching the split-ring magnetic resonance. The resulting transmission contrast supports binary amplitude holography, allowing reversible switching between a non-informative output and a reconstructed holographic image. To enhance security, we integrate Shamir’s visual cryptography: the plaintext is recovered only by decoding and superposing two independent share images mapped to separate metasurfaces. Incorporating VO 2 adds a thermal access dimension for multi-level security.
Fields of Study & Subjects
Metamaterials and Metasurfaces Applications
Advanced Wireless Communication Technologies
Chaos-based Image/Signal Encryption
Publication details
- Journal / source
- Optical Materials Express
- Publisher
- Optica Publishing Group
- Volume
- 16
- Issue
- 4
- Pages
- 970–970
- Publication date
- 12 March 2026
- Language
- EN