Dynamic Hybrid Metasurfaces

• DOI: 10.1021/acs.nanolett.0c03625
• Publication Date: 2021-01-23T03:40:03Z
• Authors: Sajjad Abdollahra...; Omid Hemmatyar; Mohammad Taghinejad; Hossein Taghinejad; Yashar Kiarashinejad; Mohammadreza Zand...; Tianren Fan; Sanchit Deshmukh; Ali A. Eftekhar; Wenshan Cai; Eric Pop; Mostafa A. El-Sayed; Ali Adibi
• Keywords: next-generation reprogrammable meta.; Biophysics; incident light; FOS: Physical sciences; all-dielectric nanoantennas; Applied Physics (physics.app-ph); 02 engineering and technology; specular beam deflection; modulation depth; metasurface platform; Genetics; GST; phase-change material Ge 2 Sb 2 Te 5; Molecular Biology; Cancer; tunable metasurfaces; plasmonic-photonic resonances; reduced-dimension meta-atom; Cell Biology; Physics - Applied Physics; plasmonic-photonic metasurfaces; Dynamic Hybrid Metasurfaces Efficient; postfabrication tunable; metal-dielectric meta-atoms; 0210 nano-technology; Physical Sciences not elsewhere classified; Developmental Biology; Biological Sciences not elsewhere classified; Physics - Optics; Optics (physics.optics)

Efficient hybrid plasmonic-photonic metasurfaces that simultaneously take advantage of the potential both pure metallic and all-dielectric nanoantennas are identified as an emerging technology in flat optics. Nevertheless, post-fabrication tunable still elusive. Here, we present a reconfigurable metasurface platform by incorporating phase-change material Ge$_{2}$Sb$_{2}$Te$_{5}$ (GST) into metal-dielectric meta-atoms for active non-volatile tuning properties light. We systematically design reduced-dimension meta-atom, which selectively controls fundamental resonances via dynamic change optical constants GST without compromising scattering efficiency. As proof-of-concept, experimentally demonstrate miniaturized control amplitude phase incident light necessary high-contrast switching anomalous to specular beam deflection, respectively. Finally, leverage deep learning-based approach intuitive low-dimensional visualization enhanced range response reconfiguration enabled addition GST. Our findings further substantiate dynamically promising candidates development small-footprint energy harvesting, imaging, signal processing devices.