Enhanced photoluminescence of CdSe quantum dots by the coupling of Ag nanocube and Ag film

doi:10.1088/1674-1056/23/8/086102

Abstract The coupling of local surface plasmon (LSP) of nanoparticle and surface plasmon (SP) mode produced by metal film can lead to the enhanced electromagnetic field, which has an important application in enhancing the fluorescence of quantum dots (QDs). Herein, the Ag nanocube and Ag film are used to enhance the fluorescence of CdSe QDs. The enhancement is found to relate to the sizes of the Ag nanocube and the thickness of the Ag film. Moreover, we also present the fluorescence enhancement caused by only SP. The result shows that the coupling between metal nanoparticles and metal film can realize larger field enhancement. Numerical simulation verifies that a nanocube can localize a strong electric field around its corner. All the results indicate that the fluorescence of QDs can be efficiently improved by optimizing the parameters of Ag film and Ag cubes.

Keywords: Ag nanocube local surface plasmon Ag film photoluminescence

Received: 04 September 2013
Revised: 31 March 2014
Accepted manuscript online:

PACS:	61.46.Df	(Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))
	73.63.Kv	(Quantum dots)
	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)
	68.37.Hk	(Scanning electron microscopy (SEM) (including EBIC))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51272246 and 81172082) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2030000001).

Corresponding Authors: Zhu Li-Xin, Xu Xiao-Liang
E-mail: lx-zhu@163.com;xlxu@ustc.edu.cn

Cite this article:

Jiang Tong-Tong (蒋童童), Shao Wei-Jia (邵伟佳), Yin Nai-Qiang (尹乃强), Liu Ling (刘玲), Song Jiang-Lu-Qi (宋江鲁奇), Zhu Li-Xin (朱立新), Xu Xiao-Liang (许小亮) Enhanced photoluminescence of CdSe quantum dots by the coupling of Ag nanocube and Ag film 2014 Chin. Phys. B 23 086102

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Enhanced photoluminescence of CdSe quantum dots by the coupling of Ag nanocube and Ag film

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