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Strong anisotropic lifetime orientation distributions of a two-level quantum emitter around a plasmonic nanorod

Jia-Ming Liu1, Jing-Feng Liu2, Yi-Cong Yu3, Ling-Yu Zeng1 and Xue-Hua Wang1*

Author Affiliations

1 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China

2 College of Science, South China Agriculture University, Guangzhou 510642, China

3 Department of Physics, Foshan University, Foshan 528000, China

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Nanoscale Research Letters 2014, 9:194  doi:10.1186/1556-276X-9-194

Published: 28 April 2014

Abstract

Spontaneous emission lifetime orientation distributions of a two-level quantum emitter in metallic nanorod structures are theoretically investigated by the rigorous electromagnetic Green function method. It was found that spontaneous emission lifetime strongly depended on the transition dipole orientation and the position of the emitter. The anisotropic factor defined as the ratio between the maximum and minimum values of the lifetimes along different dipole orientations can reach up to 103. It is much larger than those in dielectric structures which are only several times usually. Our results show that the localized plasmonic resonance effect provides a new degree of freedom to effectively control spontaneous emission by the dipole orientation of the quantum emitters.