Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material
Author(s)Zhang, Yifei; Fowler, Clayton; Liang, Junhao; Azhar, Bilal; Shalaginov, Mikhail Y; Deckoff-Jones, Skylar; An, Sensong; Chou, Jeffrey B; Roberts, Christopher M; Liberman, Vladimir; Kang, Myungkoo; Ríos, Carlos; Richardson, Kathleen A; Rivero-Baleine, Clara; Gu, Tian; Zhang, Hualiang; Hu, Juejun; ... Show more Show less
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Active metasurfaces promise reconfigurable optics with drastically improved compactness, ruggedness, manufacturability and functionality compared to their traditional bulk counterparts. Optical phase-change materials (PCMs) offer an appealing material solution for active metasurface devices with their large index contrast and non-volatile switching characteristics. Here we report a large-scale, electrically reconfigurable non-volatile metasurface platform based on optical PCMs. The optical PCM alloy used in the devices, Ge2Sb2Se4Te (GSST), uniquely combines giant non-volatile index modulation capability, broadband low optical loss and a large reversible switching volume, enabling notably enhanced light-matter interactions within the active optical PCM medium. Capitalizing on these favourable attributes, we demonstrated quasi-continuously tuneable active metasurfaces with record half-octave spectral tuning range and large optical contrast of over 400%. We further prototyped a polarization-insensitive phase-gradient metasurface to realize dynamic optical beam steering.
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Zhang, Yifei, Fowler, Clayton, Liang, Junhao, Azhar, Bilal, Shalaginov, Mikhail Y et al. 2021. "Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material." Nature Nanotechnology, 16 (6).