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

作　　者：李强 魏红 徐红星 

机构地区：[1]Institute of Physics,Chinese Academy of Sciences,and Beijing National Laboratory for Condensed Matter Physics [2]Center for Nanoscience and Nanotechnology,and School of Physics and Technology,Wuhan University

出　　处：《Chinese Physics B》2014年第9期10-14,共5页中国物理B（英文版）

基　　金：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);the Knowledge Innovation Project of Chinese Academy of Sciences(Grant No.KJCX2-EWW04)

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.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 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O471.1[理学—半导体物理]