Electrically tunable THz response in metasurface ideal for real time holographic imaging/ encryption

https://phys.org/news/2025-09-electrically-tunable-metasurface-real-thz.html

"microladder metasurface (handrails of gold wire/ steps of small vanadium dioxide gaps) overcomes THz limitations minimizing: energy consumption (low 68°C)/ reversible insulator-to-metal <3 second response time... external current/ resistive heating induced quick transition... combination dynamic pixels (with VO2)/ static pixels (without VO2) holographically encodes characters into metasurface... THz focal-plane imaging for reading THz images at high speed... holography, encryption, medical imaging"