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首页> 外文期刊>Conference Papers in Science >Near-Field Hot Spots in Gold Nanoplasmonic Templates and Their Use for Surface Enhanced Raman Scattering Sensing Application
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Near-Field Hot Spots in Gold Nanoplasmonic Templates and Their Use for Surface Enhanced Raman Scattering Sensing Application

机译：金纳米等离子体模板中的近场热点及其在表面增强拉曼散射传感中的应用

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Finite difference time domain (FDTD) method is adapted to investigate near-field enhancement effects on plasmonic structures (patterned in gold film) such as concentric rings with small separation, square, and rectangle. The near-fields effect on surface enhanced Raman scattering (SERS) is typically studied on square and rectangular structures. These metal structures are fabricated by laser interference lithography. Raman active molecules (Rhodamine 6G in PMMA (polymethyl methacrylate)) are spread onto patterned structure by spin coating, and Renishaw inVia Raman spectrometer was used to study SERS. Typical SERS enhancement of the order of 105is seen for square and rectangular structures. It is observed that the corner points and edges of square and rectangular structures are most sensitive to concentrate near fields. In the case of concentric rings, huge near fields are seen to exist at the gap between the metal rings. Concentric rings are proposed to be very effective structure for SERS sensing applications such as molecular identification and biological mapping.
机译：有限差分时域（FDTD）方法适用于研究对等离激元结构（在金膜中形成图案）的近场增强效应，例如具有小间距，正方形和矩形的同心环。通常在正方形和矩形结构上研究表面增强拉曼散射（SERS）的近场效应。这些金属结构是通过激光干涉光刻法制造的。通过旋涂将拉曼活性分子（PMMA中的若丹明6G（聚甲基丙烯酸甲酯））散布到有图案的结构上，然后使用雷尼绍inVia拉曼光谱仪研究SERS。对于正方形和矩形结构，可以看到典型的SERS增强105级。可以看出，正方形和矩形结构的拐角点和边缘对集中在场附近最为敏感。对于同心环，可以看到在金属环之间的间隙处存在巨大的近场。提出同心环对于SERS传感应用（例如分子鉴定和生物学作图）是非常有效的结构。

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