Enormous enhancement of electric field in active gold nanoshells

doi:10.1088/1674-1056/23/4/047807

Abstract The electric field enhancement properties of an active gold nanoshell with gain material inside have been investigated by using Mie theory. As the gain coefficient of the inner core increases to a critical value, a super-resonance appears in the active gold nanoshell, and enormous enhancements of the electric fields can be found near the surface of the particle. With increasing shell thickness, the critical value of the gain coefficient for the super-resonance of the active gold nanoshell first decreases and then increases, and the corresponding surface enhanced Raman scattering (SERS) enhancement factor (G factor) also first increases and then decreases. The optimized active gold nanoshell can be obtained with an extremely high SERS G factor of the order of 10¹⁹-10²⁰. Such an optimized active gold nanoshell possesses a high-efficiency SERS effect and may be useful for single-molecule detection.

Keywords: gold nanoshell enhancement of electric field surface-enhanced Raman scattering gain material

Received: 09 September 2013
Revised: 10 October 2013
Accepted manuscript online:

PACS:	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)
	36.40.Vz	(Optical properties of clusters)
	73.22.Lp	(Collective excitations)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB921504), the National Natural Science Foundation of China (Grant Nos. 51306072, 11174113, and 11204129), the Qing LanProject of Jiangsu Province, China, and the Senior Talent Foundation of Jiangsu University (Grant No. 12JDG060).

Corresponding Authors: Wu Da-Jian, Liu Xiao-Jun
E-mail: wudajian@ujs.edu.cn;liuxiaojun@nju.edu.cn

About author: 78.67.-n; 78.67.Bf; 36.40.Vz; 73.22.Lp

Cite this article:

Jiang Shu-Min (蒋书敏), Wu Da-Jian (吴大建), Wu Xue-Wei (吴雪炜), Liu Xiao-Jun (刘晓峻) Enormous enhancement of electric field in active gold nanoshells 2014 Chin. Phys. B 23 047807

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