中国物理B ›› 2014, Vol. 23 ›› Issue (9): 97302-097302.doi: 10.1088/1674-1056/23/9/097302

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Remote excitation and remote detection of a single quantum dot using propagating surface plasmons on silver nanowire

李强a, 魏红a, 徐红星a b   

  1. a Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China;
    b Center for Nanoscience and Nanotechnology, and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 收稿日期:2014-04-25 修回日期:2014-05-20 出版日期:2014-09-15 发布日期:2014-09-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11374012, 11134013, 11227407, and 61210017), the Ministry of Science and Technology of China (Grant No. 2012YQ12006005), and the Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. KJCX2-EW-W04).

Remote excitation and remote detection of a single quantum dot using propagating surface plasmons on silver nanowire

Li Qiang (李强)a, Wei Hong (魏红)a, Xu Hong-Xing (徐红星)a b   

  1. a Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China;
    b Center for Nanoscience and Nanotechnology, and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • Received:2014-04-25 Revised:2014-05-20 Online:2014-09-15 Published:2014-09-15
  • Contact: Wei Hong E-mail:weihong@iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11374012, 11134013, 11227407, and 61210017), the Ministry of Science and Technology of China (Grant No. 2012YQ12006005), and the Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. KJCX2-EW-W04).

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摘要： Using propagating surface plasmons (SPs) on a silver nanowire (NW), we demonstrate that a focused laser light at the end of the silver NW can excite a single quantum dot (QD) microns away from the excitation spot. The QD-NW interaction allows the excited QD convert part of its energy into propagating SPs, which then can be detected at remote sites. Simultaneous multi-QD remote excitation and remote detection can also be realized. Furthermore, the tight confinement of the propagating SPs around the NW surface enables the selective excitation of QDs very close in space, which cannot be realized under the conventional excitation condition. This remote excitation and remote detection approach may find applications in optical imaging and the sensing of chemical and biological systems.

关键词: surface plasmons, silver nanowire, quantum dot, fluorescence

Abstract: Using propagating surface plasmons (SPs) on a silver nanowire (NW), we demonstrate that a focused laser light at the end of the silver NW can excite a single quantum dot (QD) microns away from the excitation spot. The QD-NW interaction allows the excited QD convert part of its energy into propagating SPs, which then can be detected at remote sites. Simultaneous multi-QD remote excitation and remote detection can also be realized. Furthermore, the tight confinement of the propagating SPs around the NW surface enables the selective excitation of QDs very close in space, which cannot be realized under the conventional excitation condition. This remote excitation and remote detection approach may find applications in optical imaging and the sensing of chemical and biological systems.

Key words: surface plasmons, silver nanowire, quantum dot, fluorescence

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
78.67.Hc (Quantum dots) 78.67.Uh (Nanowires)