All-dielectric phase-change reconfigurable metasurface

Abstract

We harness non-volatile, amorphous-crystalline transitions in the chalcogenide phase-change medium germanium antimony telluride (GST) to realize optically-switchable, all-dielectric metamaterials. Nanostructured, subwavelength-thickness films of GST present high-quality resonances that are spectrally shifted by laser-induced structural transitions, providing reflectivity and transmission switching contrast ratios of up to 5:1 (7 dB) at visible/near-infrared wavelengths selected by design.

8 pages, 8 figures

References in corpus (4)

• Dielectric Metasurfaces for Complete Control of Phase and Polarization with Subwavelength Spatial Resolution and High Transmission
• All-dielectric phase-change reconfigurable metasurface
• Nano-optomechanical Nonlinear Dielectric Metamaterials
• Electron irradiation induced reduction of the permittivity in chalcogenide glass (As2S3) thin film

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