Electrically driven reprogrammable phase-change metasurface reaching 80% efficiency

Abstract Phase-change materials (PCMs) offer a compelling platform for active metaoptics, owing to their large index contrast and fast yet stable phase transition attributes. Despite recent advances in phase-change metasurfaces, a fully integrable solution that combines pronounced tuning measures, i.e., efficiency, dynamic range, speed, and power consumption, is still elusive. Here, we demonstrate an in situ electrically driven tunable metasurface by harnessing the full potential of a PCM alloy, Ge 2 Sb 2 Te 5 (GST), to realize non-volatile, reversible, multilevel, fast, and remarkable optical modulation in the near-infrared spectral range. Such a reprogrammable platform presents a record eleven-fold change in…

• NS
  National Science Foundation

  Awards: 608801, 2004749, DMR-2004749
• SF
  Simons Foundation
• GI
  Georgia Institute of Technology
• DF
  Deutsche Forschungsgemeinschaft

  Award: SFB 917
• DA
  Defense Advanced Research Projects Agency

  Award: D19AC00001
• AR
  Advanced Research Projects Agency
• OO
  Office of Naval Research

  Awards: N00014-18-1-2055, N00014-17-1, 00014-18-1-2055, N00014-17-1-2555, N00014
• DO
  Division of Materials Research

  Award: DMR-2004749
• DO
  Division of Electrical, Communications and Cyber Systems
• DO
  Division of Chemistry

  Award: 1608801