电介质球复合纳米天线对荧光定向发射的增强

米智; 陈智辉; 杨毅彪; 费宏明; 刘欣

doi:10.3788/CO.20201301.0121

Volume 13 Issue 1

Feb. 2020

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Chinese Optics > 2020 > 13(1): 121-130.

MI Zhi, CHEN Zhi-hui, YANG Yi-biao, FEI Hong-ming, LIU Xin. Enhancement of directional luminescence emission by dielectric spheres hybrid nano-antenna[J]. Chinese Optics, 2020, 13(1): 121-130. doi: 10.3788/CO.20201301.0121

Citation:

MI Zhi, CHEN Zhi-hui, YANG Yi-biao, FEI Hong-ming, LIU Xin. Enhancement of directional luminescence emission by dielectric spheres hybrid nano-antenna[J]. Chinese Optics, 2020, 13(1): 121-130. doi: 10.3788/CO.20201301.0121

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Enhancement of directional luminescence emission by dielectric spheres hybrid nano-antenna

doi: 10.3788/CO.20201301.0121

MI Zhi^{1, 2
,},
CHEN Zhi-hui^{1, 2
,
,},
YANG Yi-biao²,
FEI Hong-ming²,
LIU Xin²

1.
Key Lab of Advanced Transducer and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
2.
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China

Funds:

National Natural Science Foundation of China 11674239

National Natural Science Foundation of China 61575139

National Natural Science Foundation of China 61575138

Program for the Top Young Talents of Shanxi Province

Program for the Sanjin Outstanding Talents of China

More Information

Corresponding author: CHEN Zhi-hui, E-mail:huixu@126.com
Received Date: 04 Apr 2019
Rev Recd Date: 14 May 2019
Publish Date: 01 Feb 2020

Abstract

Abstract

In nano-photonics, the enhancement of the intensity of directional luminescence in fluorescent substances is a key issue for many applications. In order to optimize the fluorescence enhancement capability of dielectric nano-antennas, a dielectric hybrid nano-antenna composed of a silicon nanosphere dimer and a TiO₂ microsphere is proposed. Quantum yield enhancement, fluorescence collection efficiency enhancement and fluorescence excitation rate enhancement are all studied using the finite difference time domain method to illustrate the fluorescence enhancement effect of the dielectric sphere hybrid nano-antenna. The results show that the hybrid nano-antenna can not only solve the problem with low quantum yield using the single TiO₂ microsphere, but can also compensate for low fluorescence collection efficiency using only the silicon nanosphere dimer. Due to the advantages possessed by both silicon nanosphere dimers and TiO₂ microspheres in fluorescence enhancement, the quantum yield and fluorescence collection efficiency of this hybrid nano-antenna are enhanced by about 4 and 2 times, respectively. Moreover, due to the further enhancement effect on the fluorescence excitation process with the silicon nanosphere dimer and the TiO₂ microsphere, a higher fluorescence directional enhancement factor can be achieved. When the emission wavelength is at a quantum dot central wavelength of 523 nm, the fluorescence directional enhancement can be up to 3 064 times than that of original fluorescence.
- hybrid nano-antenna,
- dielectric sphere,
- fluorescence enhancement,
- directional emission

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References(29)

References

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