Enormous enhancement of electric field in active gold nanoshells  

作　　者：蒋书敏 吴大建 吴雪炜 刘晓峻 

机构地区：[1]Faculty of Science, Jiangsu University [2]School of Physics, Nanjing University

出　　处：《Chinese Physics B》2014年第4期603-607,共5页中国物理B（英文版）

基　　金：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 Lan Project of Jiangsu Province,China;the Senior Talent Foundation of Jiangsu University(Grant No.12JDG060)

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.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 

分 类 号：O441.4[理学—电磁学]