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Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material
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Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material
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Journal Article
Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material
2021
Overview
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, Ge
2
Sb
2
Se
4
Te (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.
An electrically reconfigurable optical metasurface using a Ge
2
Sb
2
Se
4
Te phase change material shows half an octave spectral tuning and promising performances for optical beam steering applications.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
