Journal
JOURNAL OF APPLIED PHYSICS
Volume 112, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4757416
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Funding
- National Natural Science Foundation of China [60977048, 61078046, 61275153]
- Zhejiang Natural Science Foundation [LY12A04002]
- International Collaboration Project of Ningbo [2010D10018]
- Ningbo Natural Science Foundation [2012A610107]
- K. C. Wong Magna Fund of Ningbo University, China
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Surface plasmon (SP) amplification by stimulated emission of radiation (spaser) of the active nanoshell with three-layer silica-gold-silica structure is proposed. The properties of the spaser are numerically analyzed based on Mie theory. The results show that the nanoshell-based spaser is one order of magnitude higher than the nanosphere-based and nanoegg-based spasers in the surface plasmon amplification, but the gain threshold k(thre) of the silica is nearly one order of magnitude lower. In addition, the behavior of the nanoshell-based spaser depends on structural parameters that are explained by the quenching effect, plasmon hybridization theory, and dynamic photon-plasmon coupling mechanism. By optimizing the structure parameters of the layered nanoshell, an extremely high spaser enhancement over a wider operating range of wavelength tunings was obtained, both aspects having important significance in practical applications. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757416]
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