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Phase-change metasurface with tunable and switchable circular dichroism

机译:具有可调谐和可切换圆形二色性的相变质表面

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摘要

Metasurfaces with tunable/switchable circular dichroism (CD) response have great potential to serve as important elements for plenty of advanced applications. In this work, we proposed a novel metasurface absorber integrated with periodic Ge2Sb2Te5 (GST) resonators and numerically demonstrated its capability in reconfiguration of the CD effect. Due to the strong chiral plasmonic resonance, a strong CD of about 0.75 can be achieved in a prescribed spectrum. Additionally, the phase transition of GST resonators enables the quasi-linearly modification of CD strength in a broad range (from 0.03 to 0.75). Furthermore, reversible chirality of the metasurface absorber can be realized by controlling the states of the left- and righthand GST resonators separately, enabling the CD si gnal to be readily switched between on-, off-, and reverse-state. (C) 2021 Optical Society of America
机译:具有可调谐/可切换圆二色性(CD)响应的超表面具有巨大潜力,可作为许多高级应用的重要元件。在这项工作中,我们提出了一种集成周期性Ge2Sb2Te5(GST)谐振器的新型超表面吸收器,并通过数值模拟证明了其在CD效应重构中的能力。由于强手性等离子体共振,在规定的光谱中可以获得约0.75的强CD。此外,GST谐振器的相变使得CD强度可以在很宽的范围内(从0.03到0.75)进行准线性修改。此外,通过分别控制左侧和右侧GST谐振器的状态,可以实现超表面吸收体的可逆手性,从而使CD-si-gnal易于在开启、关闭和反向状态之间切换。(2021)美国光学学会

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  • 来源
    《Optics Letters》 |2021年第10期|共4页
  • 作者单位

    Southeast Univ Adv Photon Ctr Nanjing 210096 Peoples R China;

    Southeast Univ Adv Photon Ctr Nanjing 210096 Peoples R China;

    Southeast Univ Adv Photon Ctr Nanjing 210096 Peoples R China;

    Univ Shanghai Sci &

    Technol Sch Opt Elect &

    Comp Engn Shanghai 200093 Peoples R China;

    Southeast Univ Adv Photon Ctr Nanjing 210096 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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