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arXiv 1503.03835cond-mat.mes-hallphysics.optics
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等离子体增强拉曼散射的量子特性

Quantum Nature of Plasmon-Enhanced Raman Scattering

Patryk Kusch, Sebastian Heeg, Christian Lehmann, Niclas S. Müller, Sören Wasserroth, Antonios Oikonomou, Nick Clark, Aravind Vijayaraghavan, Stephanie Reich

摘要:

我们报告等离子体增强拉曼散射在石墨烯耦合到一个单一的等离子体热点测量作为激光能量的函数。的G峰的增强曲线显示出强烈的增强(高达$10^5$)和窄共振(30毫电子伏),这是由金纳米二聚体的局部表面等离子体引起的。我们观察到的缺陷模式的散射在一个无缺陷的石墨烯晶格中的等离子体共振的演变。我们提出了等离子体增强拉曼散射的量子理论,其中等离子体形成的激发过程的一个组成部分。散射通道之间的量子干涉解释了实验观察到的共振轮廓,特别是,显着差异的增强因子为传入和传出的共振和缺陷型模式的外观。

英文摘要:

We report plasmon-enhanced Raman scattering in graphene coupled to a single plasmonic hotspot measured as a function of laser energy. The enhancement profiles of the G peak show strong enhancement (up to $10^5$) and narrow resonances (30 meV) that are induced by the localized surface plasmon of a gold nanodimer. We observe the evolution of defect-mode scattering in a defect-free graphene lattice in resonance with the plasmon. We propose a quantum theory of plasmon-enhanced Raman scattering, where the plasmon forms an integral part of the excitation process. Quantum interferences between scattering channels explain the experimentally observed resonance profiles, in particular, the marked difference in enhancement factors for incoming and outgoing resonance and the appearance of the defect-type modes.

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