期刊
NANO LETTERS
卷 21, 期 3, 页码 1238-1245出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03625
关键词
Metasurface optics; Reconfigurability; Phase-change materials; Active nanophotonics
类别
资金
- Office of Naval Research (ONR) [N00014-18-1-2055]
- Defense Advanced Research Projects Agency (DARPA) [D19AC00001]
- National Science Foundation (NSF) [ECCS1542174]
This study introduces a reconfigurable hybrid metasurface platform by incorporating the phase-change material Ge2Sb2Te5 (GST) into metal-dielectric meta-atoms for active and nonvolatile tuning of properties of light. The reduced-dimension meta-atom can selectively control the hybrid plasmonic-photonic resonances of the metasurface via the dynamic change of optical constants of GST, demonstrating promising applications in high-contrast optical switching and efficient beam deflection. Findings suggest dynamic hybrid metasurfaces as compelling candidates for next-generation reprogrammable meta-optics.
Efficient hybrid plasmonic-photonic metasurfaces that simultaneously take advantage of the potential of both pure metallic and all-dielectric nanoantennas are identified as an emerging technology in flat optics. Nevertheless, postfabrication tunable hybrid metasurfaces are still elusive. Here, we present a reconfigurable hybrid metasurface platform by incorporating the phase-change material Ge2Sb2Te5 (GST) into metal-dielectric meta-atoms for active and nonvolatile tuning of properties of light. We systematically design a reduced-dimension meta-atom, which selectively controls the hybrid plasmonic-photonic resonances of the metasurface via the dynamic change of optical constants of GST without compromising the scattering efficiency. As a proof-of-concept, we experimentally demonstrate two tunable metasurfaces that control the amplitude (with relative modulation depth as high as approximate to 80%) or phase (with tunability >230 degrees) of incident light promising for high-contrast optical switching and efficient anomalous to specular beam deflection, respectively. Our findings further substantiate dynamic hybrid metasurfaces as compelling candidates for next-generation reprogrammable meta-optics.
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