Manipulating nonlinear emission and cooperative effect of CdSe/ZnS quantum dots by coupling to a silver nanorod complex cavity.
Colloidal semiconductor quantum dots have three-dimensional confined excitons with large optical oscillator strength and gain. The surface plasmons of metallic nanostructures offer an efficient tool to enhance exciton-exciton coupling and excitation energy transfer at appropriate geometric arrangement. Here, we report plasmon-mediated cooperative emissions of approximately one monolayer of ensemble CdSe/ZnS quantum dots coupled with silver nanorod complex cavities at room temperature. Power-dependent spectral shifting, narrowing, modulation, and amplification are demonstrated by adjusting longitudinal surface plasmon resonance of silver nanorods, reflectivity and phase shift of silver nanostructured film, and mode spacing of the complex cavity. The underlying physical mechanism of the nonlinear excitation energy transfer and nonlinear emissions are further investigated and discussed by using time-resolved photoluminescence and finite-difference time-domain numerical simulations. Our results suggest effective strategies to design active plasmonic complex cavities for cooperative emission nanodevices based on semiconductor quantum dots.
1] Department of Physics, Wuhan University, Wuhan 430072, P. R. China [2].
Fan
F
Nan
1] Department of Physics, Wuhan University, Wuhan 430072, P. R. China [2].
Zi-Qiang
ZQ
Cheng
Department of Physics, Wuhan University, Wuhan 430072, P. R. China.
Ya-Lan
YL
Wang
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
Qing
Q
Zhang
1] Department of Physics, Wuhan University, Wuhan 430072, P. R. China [2] Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
Li
L
Zhou
Beijing Computational Science Research Center, Beijing100084, P. R. China.
Zhong-Jian
ZJ
Yang
Department of Physics, Wuhan University, Wuhan 430072, P. R. China.
Yu-Ting
YT
Zhong
Department of Physics, Wuhan University, Wuhan 430072, P. R. China.
Shan
S
Liang
1] Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 [2] NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798.
Qihua
Q
Xiong
Department of Physics, Wuhan University, Wuhan 430072, P. R. China.
Qu-Quan
QQ
Wang