Enormous enhancement of electric field in active gold nanoshells

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

中国物理B ›› 2014, Vol. 23 ›› Issue (4): 47807-047807.doi: 10.1088/1674-1056/23/4/047807

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Enormous enhancement of electric field in active gold nanoshells

蒋书敏^a, 吴大建^a, 吴雪炜^b, 刘晓峻^b

a Faculty of Science, Jiangsu University, Zhenjiang 212013, China;
b School of Physics, Nanjing University, Nanjing 210093, China

收稿日期:2013-09-09 修回日期:2013-10-10 出版日期:2014-04-15 发布日期:2014-04-15
基金资助:
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).

Enormous enhancement of electric field in active gold nanoshells

Jiang Shu-Min (蒋书敏)^a, Wu Da-Jian (吴大建)^a, Wu Xue-Wei (吴雪炜)^b, Liu Xiao-Jun (刘晓峻)^b

a Faculty of Science, Jiangsu University, Zhenjiang 212013, China;
b School of Physics, Nanjing University, Nanjing 210093, China

Received:2013-09-09 Revised:2013-10-10 Online:2014-04-15 Published:2014-04-15
Contact: 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
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: gold nanoshell, enhancement of electric field, surface-enhanced Raman scattering, gain material

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.

Key words: gold nanoshell, enhancement of electric field, surface-enhanced Raman scattering, gain material

中图分类号: (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

78.67.-n

78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 36.40.Vz (Optical properties of clusters) 73.22.Lp (Collective excitations)

蒋书敏, 吴大建, 吴雪炜, 刘晓峻. Enormous enhancement of electric field in active gold nanoshells[J]. 中国物理B, 2014, 23(4): 47807-047807.

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[J]. Chin. Phys. B, 2014, 23(4): 47807-047807.

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Enormous enhancement of electric field in active gold nanoshells

Enormous enhancement of electric field in active gold nanoshells

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