Gu Wenhua, Choi Hyungsoo, Kim Kyekyoon
Thin Film and Charged Particle Research Laboratory, Department of Electrical and Computer Engineering, and Center for Nano Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
J Phys Chem A. 2007 Aug 23;111(33):8121-5. doi: 10.1021/jp073736s. Epub 2007 Jul 27.
Single molecule-single nanoparticle surface enhanced Raman scattering event is analyzed using a quantum mechanical approach, resulting in an analytical expression for the electromagnetic enhancement factor that succinctly elucidates the fundamental aspects of SERS. The nanoparticle is treated as a dielectric spherical cavity, and the resulting increase in the spontaneous emission rate of a molecule adsorbed onto the surface of the nanoparticle is examined. The overall enhancement in Raman scattering is due to both the increased local electromagnetic field and the Purcell effect. The predictions of the present model are in agreement with the simulation results of the classical model.
采用量子力学方法分析单分子-单纳米粒子表面增强拉曼散射事件，得到电磁增强因子的解析表达式，该表达式简洁地阐明了表面增强拉曼散射的基本方面。将纳米粒子视为介电球形腔，并研究吸附在纳米粒子表面的分子自发发射率的增加。拉曼散射的整体增强是由于局部电磁场的增加和珀塞尔效应。本模型的预测结果与经典模型的模拟结果一致。
