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arXiv 0909.4809physics.chem-phquant-ph
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分子-金属相互作用系统的线性响应和散射

On the linear response and scattering of an interacting molecule-metal system

David J. Masiello, George C. Schatz

摘要:

一个多体格林函数的方法,等离子体增强光谱的微观理论的局部表面等离子体共振光谱的背景下,并适用于调查的量子分子和经典的等离子体共振之间的耦合单层包覆的银纳米粒子。电子传播或格林函数,占一个单一的分子和它的图像在附近的纳米级金属之间的重复极化相互作用,明确计算和用于构建的组合分子-金属系统的线性响应特性的外部电磁扰动。在我们的方法中,状态的移动和有限寿命严格且自动地出现,并揭示了分子和金属之间的复杂耦合,而以前的理论没有完全描述。利用自洽的这种量子分子的连续电磁散射的分子-金属目标的响应纳入计算局部表面等离子体共振波长偏移相对于裸金属从第一原理。

英文摘要:

A many-body Green's function approach to the microscopic theory of plasmon-enhanced spectroscopy is presented within the context of localized surface-plasmon resonance spectroscopy and applied to investigate the coupling between quantum-molecular and classical-plasmonic resonances in monolayer-coated silver nanoparticles. Electronic propagators or Green's functions, accounting for the repeated polarization interaction between a single molecule and its image in a nearby nanoscale metal, are explicitly computed and used to construct the linear-response properties of the combined molecule-metal system to an external electromagnetic perturbation. Shifting and finite lifetime of states appear rigorously and automatically within our approach and reveal an intricate coupling between molecule and metal not fully described by previous theories. Self-consistent incorporation of this quantum-molecular response into the continuum-electromagnetic scattering of the molecule-metal target is exploited to compute the localized surface-plasmon resonance wavelength shift with respect to the bare metal from first principles.

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