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Experimental observed plasmon near-field response in isolated suspended graphene resonators

机译：隔离悬浮石墨烯谐振器中的实验观察到的等离子体近场响应

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摘要

Because of extreme three-dimensional field confinement and easy electrically tenability, plasmons in graphene nanostructures are promising candidates for many applications, such as biosensing, photodetectors and modulators. However, up to now, graphene plasmons have been explored mostly on substrates. Scatterers, corrugations and dopants induced by substrates not only add damping to plasmons but also obscure the intrinsic electronic properties of graphene. In this work, the near-field response of surface plasmons of suspended graphene circular resonators is studied with the scattering-type scanning near-field optical microscopy under different excitation wavelengths, lambda = 10.653 and 10.22 mu m, respectively. Fundamental and higher order breathing plasmon modes are revealed in real-space with the Fermi energy of graphene of only 0.132 eV. Moreover, the direct experimental evidence on near-field electric tuning in suspended graphene resonators is demonstrated by using back-gate tuning. Our work not only provides a foundation to truly understand the properties of electrons inside pure graphene, but shines light on the applications in optoelectronic devices with suspended two-dimensional materials.
机译：由于极端的三维现场限制和易于电损伤，石墨烯纳米结构中的等离子体是许多应用的候选者，例如生物传感，光电探测器和调节剂。然而，到目前为止，石墨烯等级已经探讨了基材上。由基材诱导的散射体，波纹和掺杂剂不仅加入阻尼，而且掩盖了石墨烯的内在电子性质。在这项工作中，利用不同激发波长的散射型扫描近场光学显微镜研究了悬浮石墨烯圆形谐振器的表面等离子体的近场响应，分别分别在不同的激发波长下，λ= 10.653和10.22μm。基本呼吸呼吸等离子体模式在实际空间中显示，具有仅0.132 eV的石墨烯的费米能量。此外，通过使用后栅极调谐证明了悬浮石墨烯谐振器中的近场电动调谐的直接实验证据。我们的工作不仅为真正了解纯石墨烯内电子的性质，而且还提供了基础，但在具有悬浮二维材料的光电器件中的应用中闪耀着光。

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  • 来源
    《Nanotechnology》 |2019年第50期|共6页
  • 作者

    Zhang Ni; Jiang Xiaojie; Fan Jiang; Luo Weiwei; Xiang Yinxiao; Wu Wei; Ren Mengxin; Zhang Xinzheng; Cai Wei; Xu Jingjun;

  • 作者单位

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

    Nankai Univ Sch Phys Minist Educ Key Lab Weak Light Nonlinear Photon Tianjin 300457 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    suspended graphene; plasmons; near-field; s-SNOM; circular resonators;

    机译：悬浮的石墨烯;等离子体;近场;S-SNOM;圆形谐振器;

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