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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Polarization Selection Rules for Surface-Enhanced Raman Scattering from Anisotropic Microstructured Surfaces
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Polarization Selection Rules for Surface-Enhanced Raman Scattering from Anisotropic Microstructured Surfaces

机译：各向异性微结构化表面的表面增强拉曼散射的极化选择规则

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摘要

From a study of the polarization dependence of the surface-enhanced Raman (SERS) modes of a probe molecule (pyridine) adsorbed on a locally anisotropic, metallic surface, we show that the polarization asymmetry associated with the in-plane (ring stretching) vibrational modes is consistently correlated with the morphological anisotropy, while the out-of-plane (ring deformation) modes are almost insensitive to it. As a direct application of this "polarization selection rule" for SERS, we further show that the polarization asymmetry of the in-plane vibrational modes provides a quantitative estimate of the degree of local structural anisotropics in the system. Such mesoscale, locally ordered, anisotropic structures occur naturally in a wide variety of aggregated and self-assembled systems. As a model system for this study, we have used metal nanorod arrays, whose tips can be made to form two-dimensional clusters that exhibit anisotropy at mesoscopic length scales.
机译：通过对吸附在局部各向异性金属表面上的探针分子（吡啶）的表面增强拉曼（SERS）模的偏振依赖性的研究，我们发现与平面内（环拉伸）振动相关的偏振不对称性模态与形态各向异性始终相关，而平面外（环形变形）模态几乎对它不敏感。作为对SERS的“极化选择规则”的直接应用，我们进一步表明，平面内振动模式的极化不对称性提供了系统中局部结构各向异性程度的定量估计。这种中尺度，局部有序的各向异性结构自然存在于各种聚集和自组装系统中。作为这项研究的模型系统，我们使用了金属纳米棒阵列，可以制作其尖端以形成二维簇，这些簇在介观的长度尺度上表现出各向异性。

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