Enormous enhancement of electric field in active gold nanoshells
Enormous enhancement of electric field in active gold nanoshells
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DOI：
10.1088/1674-1056/23/4/047807
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发表时间：
2014-02
影响因子：
1.7
通讯作者：
Shumin Jiang;Dajian Wu;Xuewei Wu;Xiao-jun Liu
中科院分区：
文献类型：
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作者：
Shumin Jiang;Dajian Wu;Xuewei Wu;Xiao-jun Liu
利用Mie理论研究了内有增益材料的活性金纳米壳层的电场增强特性。当内核的增益系数增加到一个临界值时，活性金纳米壳层中出现超共振，并且在颗粒表面附近可以发现电场的巨大增强。随着壳层厚度的增加，活性金纳米壳层超共振增益系数的临界值先减小后增大，相应的表面增强拉曼散射（Sers）增强因子（G因子）也先增大后减小.优化的活性金纳米壳层可以获得极高Sers G因子的数量级为1019-1020。这种优化的活性金纳米壳层具有高效的Sers效应，可用于单分子检测。
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.