![]() Spatiotemporal light control with active metasurfaces. We further prototyped a polarization-insensitive phase-gradient metasurface to realize dynamic optical beam steering. 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%. The optical PCM alloy used in the devices, Ge 2Sb 2Se 4Te (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. Here we report a large-scale, electrically reconfigurable non-volatile metasurface platform based on optical PCMs. Optical phase-change materials (PCMs) offer an appealing material solution for active metasurface devices with their large index contrast and non-volatile switching characteristics. Active metasurfaces promise reconfigurable optics with drastically improved compactness, ruggedness, manufacturability and functionality compared to their traditional bulk counterparts.
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