Spatio-Spectral Characterization of Multipolar Plasmonic Modes of Au Nanorods via Tip-Enhanced Raman Scattering,The Journal of Physical Chemistry Letters

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Spatio-Spectral Characterization of Multipolar Plasmonic Modes of Au Nanorods via Tip-Enhanced Raman Scattering
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-03-25 , DOI: 10.1021/acs.jpclett.0c00485
Ashish Bhattarai ₁ , Brian T. O’Callahan ₂ , Chih-Feng Wang ₁ , ShanYi Wang ₁ , Patrick Z. El-Khoury ₁

Affiliation

Tip-enhanced Raman (TER) spectral images of 4-thiobenzonitrile-coated Au nanorods map the spatial profiles and trace the resonances of dipolar and multipolar plasmonic modes that are characteristic of the imaged particles. For any particular rod, we observe sequential transitions between high-order modes at low frequency shifts and lower-order modes at higher frequencies. We also notice that higher-order modes (up to m = 4) are generally observed for long rods as compared to their shorter analogues, where longitudinal dipolar resonances (m = 1) are observable. In effect, this work adds a new dimension to local optical field mapping via TERS, which we have previously explored. Not only can the magnitudes, vector components, local/nonlocal characters of local optical fields be imaged through molecular TERS, but spatially varying local optical resonances are also direct observables.

中文翻译：

通过尖端增强拉曼散射的金纳米棒的多极等离子体模式的时空光谱表征。

4-硫代苄腈涂层金纳米棒的尖端增强拉曼（TER）光谱图像绘制了空间轮廓，并描绘了成像颗粒所特有的偶极和多极等离子体模式的共振。对于任何特定的杆，我们观察到低频移动时高阶模态和高频下低阶模态之间的顺序过渡。我们也注意到较高阶模式（最多米= 4）为长棒通常观察相比，其更短的类似物，其中纵向偶极共振（米= 1）是可观察的。实际上，这项工作为我们以前探索过的通过TERS的局部光场映射增加了新的维度。不仅可以通过分子TERS成像局部光学场的大小，矢量分量，局部/非局部特征，而且空间变化的局部光学共振也可以直接观察到。

更新日期：2020-04-24

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