期刊
NANO LETTERS
卷 15, 期 12, 页码 8181-8187出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03654
关键词
Quantum dot; silver nanowire; exciton; suiface plasmons; quantum yield; decay rates
类别
资金
- Ministry of Science and Technology of China [2015CB932400, 2012YQ12006005]
- National Natural Science Foundation of China [11422436, 11374012, 11227407, 11134013, 61210017]
- CAS [XDB07030100]
- Beijing Municipal Science and Technology Commission
The interactions between surface plasmons (SPs) in metal nanostructures and excitons in quantum emitters (QEs) lead to many interesting phenomena and potential applications that are strongly dependent on the quantum yield of SPs. The difficulty in distinguishing all the possible exciton recombination channels hinders the experimental determination of SP quantum yield. Here, we experimentally measured for the first time the quantum yield of single SPs generated by the exciton plasmon coupling in a system composed of a single quantum dot and a silver nanowire (NW). By utilizing the SP guiding property of the NW, the decay rates of all the exciton recombination channels, i.e., direct free space radiation channel, SP generation channel, and nonradiative damping channel, are quantitatively obtained. It is determined that the optimum emitter-NW coupling distance for the largest SP quantum yield is about 10 nm, resulting from the different distance-dependent decay rates of the three channels. These results are important for manipulating the coupling between plasmonic nanostructures and QEs and developing on-chip quantum plasmonic devices for potential nanophotonic and quantum information applications.
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