Plasmon-Modulated Photoluminescence of Individual Gold Nanostructures
Plasmon-Modulated Photoluminescence of Individual Gold Nanostructures
复制标题
单个金纳米结构的等离激元调制光致发光
DOI：
10.1021/nn3039066
复制
发表时间：
2012-11-01
期刊：
影响因子：
17.1
通讯作者：
Shen, Ze Xiang
中科院分区：
文献类型：
--
作者：
Hu, Hailong;Duan, Huigao;Shen, Ze Xiang
在这项工作中，我们系统地研究了光刻技术定义的单个金纳米结构的光致发光和散射光谱。我们确定等离子体在光致发光中的作用是调制激发电子和发射光子之间的能量转移。通过比较光致发光光谱和散射光谱，我们观察到单个金纳米结构的光致发光表现出与粒子等离子体共振相同的对形状、大小和等离子体激元耦合的依赖。我们的研究结果提供了确凿的证据，证明金纳米结构中的光致发光确实是通过金属本身受激发电子驱动的等离子体共振的辐射阻尼发生的。此外，我们通过分析光致发光峰的可重复蓝移（相对于散射峰）和光致发光的不完全去极化的观察，对潜在的机制提供了新的见解。
In this work, we performed a systematic study on the photoluminescence and scattering spectra of individual gold nanostructures that were lithographically defined. We identify the role of plasmons in photoluminescence as modulating the energy transfer between excited electrons and emitted photons. By comparing photoluminescence spectra with scattering spectra, we observed that the photoluminescence of individual gold nanostructures showed the same dependencies on shape, size, and plasmon coupling as the particle plasmon resonances. Our results provide conclusive evidence that the photoluminescence in gold nanostructures indeed occurs via radiative damping of plasmon resonances driven by excited electrons in the metal itself. Moreover, we provide new insight on the underlying mechanism based on our analysis of a reproducible blue shift of the photoluminescence peak (relative to the scattering peak) and observation of an incomplete depolarization of the photoluminescence.