Theory of plasmon-enhanced Forster energy transfer in optically excited semiconductor and metal nanoparticles
Theory of plasmon-enhanced Forster energy transfer in optically excited semiconductor and metal nanoparticles
复制标题
DOI：
10.1103/physrevb.76.125308
复制
发表时间：
2007-09-01
影响因子：
3.7
通讯作者：
Kotov, Nicholas A.
中科院分区：
文献类型：
--
作者：
Govorov, Alexander O.;Lee, Jaebeom;Kotov, Nicholas A.
我们描述了在金属子系统（金属纳米晶体）存在的情况下半导体纳米粒子之间的福斯特转移过程。在金属纳米晶体的存在下，福斯特过程可以变得更快。福斯特转移的增强是由于纳米级组件内部电场的等离子体辅助放大效应而发生的。同时，金属纳米晶体导致福斯特转移过程中能量损失的增加。我们根据等离子共振推导了能量转移率、光致发光强度和能量耗散率的方便方程。由于金属的强耗散，等离子体增强福斯特传输的实验观察需要特殊的条件。作为可能的实验方法，我们考虑连续波和时间分辨光致发光研究，并描述观察等离子体增强转移的条件。特别是，我们表明应该仔细分析光致发光光谱，因为等离子体增强福斯特效应可能与强激子能量耗散一起出现。我们的结果可以应用于各种实验纳米级系统。
We describe the process of Forster transfer between semiconductor nanoparticles in the presence of a metal subsystem (metal nanocrystals). In the presence of metal nanocrystals, the Forster process can become faster. The enhancement of Forster transfer occurs due to the effect of plasmon-assisted amplification of electric fields inside the nanoscale assembly. Simultaneously, metal nanocrystals lead to an increase of energy losses during the Forster transfer process. We derive convenient equations for the energy transfer rates, photoluminescence intensities, and energy dissipation rates in the please of plasmon resonances. Because of strong dissipation due to the metal, an experimental observation of plasmon-enhanced Forster transfer requires special conditions. As possible experimental methods, we consider cw- and time-resolved photoluminescence studies and describe the conditions to observe plasmon-enhanced transfer. In particular, we show that the photoluminescence spectra should be carefully analyzed since the plasmon-enhanced Forster effect can appear together with strong exciton energy dissipation. Our results can be applied to a variety of experimental nanoscale systems.