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Proceedings Paper

Enhanced spontaneous emission of electric dipole by nano-optical antenna
Author(s): H. Gao; K. Li; F. M. Kong; H. Xie; J. Zhao
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Paper Abstract

We study the characteristics of nano-optical antenna made of two gold nano-particles by three dimensional numerical calculations at visible and near infrared band. To carry the computational burden and guarantee the precision and speed of a 3D FDTD calculation, adaptive mesh refinement technology is used. We first highlight the concrete way of controlling over the emitter position to fulfill the requirements of larger spontaneous emission enhancement. By exciting the resonance of surface plasmon polaritons (SPPs), we find that the far field directivity is strongly influenced and obtain around 5000-fold spontaneous emission enhancement. Choosing the incident wavelength of 600nm, we compute the decay rates and radiant efficiency as a function of antenna geometry limitations, showing the particle with an aspect ratio of L/R=4 is best for enhancing spontaneous emission. Furthermore, we proceed a spectrum analysis and find an exact relationship between the particle length and resonant wavelength.

Paper Details

Date Published: 2 December 2009
PDF: 10 pages
Proc. SPIE 7631, Optoelectronic Materials and Devices IV, 76311D (2 December 2009); doi: 10.1117/12.852111
Show Author Affiliations
H. Gao, Shandong Univ. (China)
K. Li, Shandong Univ. (China)
F. M. Kong, Shandong Univ. (China)
H. Xie, Shandong Univ. (China)
J. Zhao, Shandong Univ. (China)

Published in SPIE Proceedings Vol. 7631:
Optoelectronic Materials and Devices IV
Jian-Jun He; Guang-Hua Duan; Fumio Koyama; Ming C. Wu, Editor(s)

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