Surface plasmon-mediated energy transfer in heterogap Au-Ag nanowires.
Surface plasmon-mediated energy transfer in heterogap Au-Ag nanowires.
复制标题
DOI：
10.1021/nl8023164
复制
发表时间：
2008-10
期刊：
影响因子：
10.8
通讯作者：
Mirkin CA
中科院分区：
文献类型：
--
作者：
Wei W;Li S;Qin L;Xue C;Millstone JE;Xu X;Schatz GC;Mirkin CA
我们报道了通过表面等离子体共振（SPR）激发，从金（Au）纳米盘对到银（Ag）纳米线跨越120 nm间隙的能量转移的观察。由Au SPR激发产生的增强的电磁（EM）场诱导Ag段中的传导电子的振荡，即使Ag段与入射电磁辐射仅具有弱的共振相互作用，也将能量传递到Ag段。诱导的Ag SPR在Ag段的位置处产生强EM场，导致比当Ag段单独存在（不与Au纳米盘对相邻）时大约15倍的拉曼信号。当激光功率密度为10 kW/cm ~ 2时，拉曼强度与入射激光强度呈非线性关系，这与电磁理论计算结果一致，电磁理论计算结果不能解释线性机制下的15倍增强。这表明从Au盘对到Ag段的能量转移涉及增强的非线性偏振机制，例如可以由电子克尔效应或受激拉曼散射产生。
We report the observation of energy transfer from a gold (Au) nanodisk pair to a silver (Ag) nanowire across a 120 nm gap via surface plasmon resonance (SPR) excitation. The enhanced electromagnetic (EM) fields generated by Au SPR excitation induce oscillation of the conduction electrons in the Ag segment, transferring energy to it even though the Ag segment has only weak resonant interactions with the incident electromagnetic radiation. The induced Ag SPR produces strong EM fields at the position of the Ag segment, leading to a Raman signal ~15 times greater than when the Ag segment is alone (not adjacent to the Au nanodisk pair). The Raman intensity is found to depend nonlinearly on the incident laser intensity for laser power densities of 10 kW/cm2, which is consistent with the results of electromagnetic theory calculations which are not able to account for the factor of 15 enhancement based on a linear mechanism. This suggests that energy transfer from the Au disk pair to the Ag segment involves an enhanced nonlinear polarization mechanism such as can be produced by the electronic Kerr effect or stimulated Raman scattering.
登录
查看更多内容
影响因子：
3.3
作者：
Keating, CD;Kovaleski, KM;Natan, MJ
通讯作者：
Natan, MJ
影响因子：
8.6
作者：
Lehmann, J;Merschdorf, M;Gerber, G
通讯作者：
Gerber, G
影响因子：
56.9
作者：
Andrew, P;Barnes, WL
通讯作者：
Barnes, WL
影响因子：
--
作者：
PRESTON, CK;MOSKOVITS, M
通讯作者：
MOSKOVITS, M
影响因子：
3.7
作者：
Aizpurua, J;Bryant, GW;Mallouk, T
通讯作者：
Mallouk, T