Dynamic Hybrid Metasurfaces
Dynamic Hybrid Metasurfaces
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DOI：
10.1021/acs.nanolett.0c03625
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发表时间：
2021-01-22
期刊：
影响因子：
10.8
通讯作者：
Adibi, Ali
中科院分区：
文献类型：
--
作者：
Abdollahramezani, Sajjad;Hemmatyar, Omid;Adibi, Ali
同时利用纯金属和全电介质纳米天线的潜力的高效混合等离子体-光子超颖表面被确定为平面光学中的新兴技术。然而，制造后可调混合超颖表面仍然是难以捉摸的。在这里，我们提出了一个可重构的混合超颖表面平台，通过将相变材料Ge 2Sb 2 Te 5（GST）纳入金属介电元原子的光的性质的主动和非易失性调谐。我们系统地设计了一个降维的元原子，它选择性地控制混合等离子体-光子共振的元表面通过动态变化的GST的光学常数，而不影响散射效率。作为概念验证，我们通过实验证明了两种可调超颖表面，它们分别控制入射光的振幅（相对调制深度高达约80%）或相位（可调谐性>230度），有望实现高对比度光学开关和高效的镜面光束偏转。我们的研究结果进一步证实了动态混合元表面作为下一代可重编程元光学器件的引人注目的候选者。
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.