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arXiv 1602.00874cond-mat.mes-hall
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非局域等离子体系综远场响应的鲁棒性

Robustness of the far-field response of nonlocal plasmonic ensembles

Christos Tserkezis, Johan R. Maack, Zhaowei Liu, Martijn Wubs, N. Asger Mortensen

摘要:

与经典预测相反,几纳米等离子体粒子的光学响应取决于粒子大小,这是由于非局域性和电子溢出等效应。因此,预计这种纳米颗粒(NP)的合奏表现出非经典的不均匀的光谱增宽,由于尺寸分布。对于一个正常分布的自由电子纳米粒子,并在简单的非局部流体动力学德鲁德模型(HDM),非局部蓝移和等离子体激元线宽被证明是相当大的整体平均的影响。然而,尺寸方差效应往往隐藏非局部性在较小程度上时,考虑到均匀的尺寸依赖性扩大个别纳米颗粒,无论是通过一个本地的尺寸依赖性阻尼(SDD)模型或通过广义非局部光学响应(GNOR)理论。系综平均的作用进一步探讨在现实的分布中的贵金属纳米颗粒,在实验中遇到的,而通过可测量的数量来评估非均匀加宽的重要性的分析表达式的开发。我们的研究结果是独立的特定的非经典理论使用,从而提供了重要的洞察到大范围的实验纳米和量子等离子体。

英文摘要:

Contrary to classical predictions, the optical response of few-nm plasmonic particles depends on particle size due to effects such as nonlocality and electron spill-out. Ensembles of such nanoparticles (NPs) are therefore expected to exhibit a nonclassical inhomogeneous spectral broadening due to size distribution. For a normal distribution of free-electron NPs, and within the simple nonlocal Hydrodynamic Drude Model (HDM), both the nonlocal blueshift and the plasmon linewidth are shown to be considerably affected by ensemble averaging. Size-variance effects tend however to conceal nonlocality to a lesser extent when the homogeneous size-dependent broadening of individual NPs is taken into account, either through a local size-dependent damping (SDD) model or through the Generalized Nonlocal Optical Response (GNOR) theory. The role of ensemble averaging is further explored in realistic distributions of noble-metal NPs, as encountered in experiments, while an analytical expression to evaluate the importance of inhomogeneous broadening through measurable quantities is developed. Our findings are independent of the specific nonclassical theory used, thus providing important insight into a large range of experiments on nanoscale and quantum plasmonics.

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