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首页> 外文会议>Photonic and phononic properties of engineered nanostructures VII >Ultra-sensitive molecular detection using surface-enhanced Raman scattering on periodic metal-dielectric nanostructures
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Ultra-sensitive molecular detection using surface-enhanced Raman scattering on periodic metal-dielectric nanostructures

机译：使用周期性金属介电纳米结构上的表面增强拉曼散射进行超灵敏分子检测

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Surface-enhanced Raman scattering (SERS) is a powerful technique for trace chemical analysis and single molecule detection in the application of biochemical monitoring and food safety due to its ability to enhance the Raman scattering of molecules near the metallic surface or nanostructures. Here, we present a comprehensive study of the SERS enhancement by the periodically nanostructured surface, where the thin film of silver is deposited onto the surface, except the sidewall of posts, of 1-D lamellar gratings with varying pitch to forming metal-dielectric composite nanostructures. By enhancing the localized and surface-propagating mode in the vicinity of the concaves, the SERS signal can be improved by amplifying the intensity of electric field and increasing the optical path length of the incident light. Experimental investigations show that the enhancement factor can be manipulated by varying the polarization of incident light and the pitch size of gratings. To demonstrate the SERS effects of the proposed structures, thin layers of benzoic acid, which is commonly used as a food preservative, are deposited on the SERS substrates by spin-coating a solution of benzoic acid and dried at room temperature. A Confocal Raman microscope with a 532 nm laser source is used to illuminate light and measure the Raman spectrum of benzoic acid. We demonstrate the Raman signal of benzoic acid can be enhanced on the order of 102 on the SERS substrates.
机译：由于表面增强拉曼散射（SERS）能够增强金属表面或纳米结构附近分子的拉曼散射，因此是在生化监测和食品安全应用中进行痕量化学分析和单分子检测的一项强大技术。在这里，我们对周期性纳米结构表面对SERS的增强进行了全面研究，在该表面上，银薄膜沉积到具有不同节距的一维层状光栅的表面上（柱的侧壁除外），以形成金属-电介质复合材料纳米结构。通过增强凹部附近的局部和表面传播模式，可以通过放大电场强度和增加入射光的光路长度来改善SERS信号。实验研究表明，可以通过改变入射光的偏振和光栅的间距大小来控制增强因子。为了证明所提出结构的SERS效果，通常将旋涂食品的防腐剂苯甲酸薄层通过旋涂苯甲酸溶液沉积在SERS基材上，并在室温下干燥。使用具有532 nm激光源的共聚焦拉曼显微镜照射光并测量苯甲酸的拉曼光谱。我们证明了在SERS底物上苯甲酸的拉曼信号可以增强102的数量级。

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