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Multistate Switching of Photonic Angular Momentum Coupling in Phase-Change Metadevices

机译：相变元中的光子角动量耦合的多态切换

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摘要

The coupling between photonic spin and orbital angular momenta is significantly enhanced at the subwavelength scale and has found a plethora of applications in nanophotonics. However, it is still a great challenge to make such kind of coupling tunable with multiple sates. Here, a versatile metasurface platform based on polyatomic phase-change resonators is provided to realize multiple-state switching of photonic angular momentum coupling. As a proof of concept, three coupling modes, namely, symmetric coupling, asymmetric coupling, and no coupling, are experimentally demonstrated at three different crystallization levels of structured Ge(2)Sb(2)Te(5)alloy. In practical applications, coded information can be encrypted in asymmetric mode using the spin degree of freedom, while revealing misleading one without proper phase change or after excessive crystallinity. With these findings, this study may open an exciting direction for subwavelength electromagnetics with unprecedented compactness, allowing to envision applications in active nanophotonics and information security engineering.
机译：光子旋转和轨道角度动量之间的耦合在亚波长尺度上显着提高，并发现了纳米泳液体中的血红蛋白。然而，通过多个sates进行这种耦合可调谐仍然是一个巨大的挑战。这里，提供了一种基于多原子相变谐振器的多功能元表面平台，以实现光子角动量耦合的多状态切换。作为概念的证据，三种耦合模式，即对称耦合，不对称耦合和无耦合，在结构化Ge（2）Sb（2）Te（5）合金的三种不同的结晶水平下实验证明。在实际应用中，编码信息可以使用自由度的旋转自由度在不对称模式中加密，同时在没有适当的相变或过度结晶后显示误导性。利用这些发现，该研究可以开启具有前所未有的紧凑性的亚波长电磁的激励方向，允许在有源纳米光电学和信息安全工程中设想应用。

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  • 来源
    《Advanced Materials》 |2020年第39期|1908194.1-1908194.9|共9页
  • 作者

    Zhang Fei; Xie Xin; Pu Mingbo; Guo Yinghui; Ma Xiaoliang; Li Xiong; Luo Jun; He Qiong; Yu Honglin; Luo Xiangang;

  • 作者单位

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Chongqing Univ Key Lab Optoelect Technol & Syst Minist Educ Chongqing 400030 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Univ Chinese Acad Sci Sch Optoelect Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Univ Chinese Acad Sci Sch Optoelect Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Univ Chinese Acad Sci Sch Optoelect Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Univ Chinese Acad Sci Sch Optoelect Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Univ Chinese Acad Sci Sch Optoelect Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China;

    Chongqing Univ Key Lab Optoelect Technol & Syst Minist Educ Chongqing 400030 Peoples R China;

    Chinese Acad Sci Inst Opt & Elect State Key Lab Opt Technol Nanofabricat & Microeng Chengdu 610209 Peoples R China|Univ Chinese Acad Sci Sch Optoelect Beijing 100049 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ge(2)Sb(2)Te(5)alloy; GST; metasurfaces; phase-change materials; spin-orbit interactions;

    机译：GE（2）SB（2）TE（5）合金;GST;METASURFACES;相变材料;旋转轨道相互作用;

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