论文标题
纳米纳米颗粒连接腔的动量分辨的表面增强了拉曼散射
Momentum-resolved surface enhanced Raman scattering from a nanowire-nanoparticle junction cavity
论文作者
论文摘要
本文中，我们报告了位于单个纳米纳米粒子连接腔内分子的定向SER的实验证据。发射局限于垂直于腔轴的狭窄范围的波形范围。除此之外，分子激发了使用泄漏辐射傅立叶显微镜成像的纳米线的多个纳米线模式。我们进一步将发射波传代表作为输出极化的函数。电线的激发指导模式显示出有趣的极化标志。使用基于有限元方法的数值模拟来证实所有结果。从本质上讲，我们在间隙腔增强的拉曼散射与其排放方向之间提供了重要的联系。结果可能与理解纳米级的腔电动力学以及分子耦合到一个维度和零维等离激元纳米结构之间的极小间隙相关。
Herein we report experimental evidence of directional SERS from molecules situated inside a single nanowire-nanoparticle junction cavity. The emission was confined to a narrow range of wavevectors perpendicular to the axis of the cavity. In addition to this, the molecules excite multiple guided modes of the nanowire which were imaged using leakage radiation Fourier microscopy. We further characterize the emission wavevectors as a function of output polarization. The excited guided modes of the wire show interesting polarization signatures. All the results were corroborated using finite element method based numerical simulations. Essentially, we provide an important connection between gap-cavity enhanced Raman scattering and its directionality of emission. The results may be of relevance in understanding the cavity electrodynamics at the nanoscale and molecular coupling to extremely small gaps between a one dimensional and a zero-dimensional plasmonic nanostructure.
