Marinaro Giovanni, Das Gobind, Giugni Andrea, Allione Marco, Torre Bruno, Candeloro Patrizio, Kosel Jurgen, Di Fabrizio Enzo
Division of Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Structural Molecular Imaging Light Enhanced Spectroscopies Laboratory, Physical Science and Engineering, Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Materials (Basel). 2018 May 17;11(5):827. doi: 10.3390/ma11050827.
In this paper, we propose the use of a standing nanowires array, constituted by plasmonic active gold wires grown on iron disks, and partially immersed in a supporting alumina matrix, for surface-enhanced Raman spectroscopy applications. The galvanic process was used to fabricate nanowires in pores of anodized alumina template, making this device cost-effective. This fabrication method allows for the selection of size, diameter, and spatial arrangement of nanowires. The proposed device, thanks to a detailed design analysis, demonstrates a broadband plasmonic enhancement effect useful for many standard excitation wavelengths in the visible and NIR. The trigonal pores arrangement gives an efficiency weakly dependent on polarization. The devices, tested with 633 and 830 nm laser lines, show a significant Raman enhancement factor, up to around 6 × 10⁴, with respect to the flat gold surface, used as a reference for the measurements of the investigated molecules.
在本文中，我们提出使用一种由生长在铁盘上的等离子体活性金线构成的纳米线阵列，该阵列部分浸入支撑性氧化铝基质中，用于表面增强拉曼光谱应用。采用电偶工艺在阳极氧化铝模板的孔中制造纳米线，使该器件具有成本效益。这种制造方法允许选择纳米线的尺寸、直径和空间排列。通过详细的设计分析，所提出的器件展示了一种宽带等离子体增强效应，对可见光和近红外波段的许多标准激发波长都很有用。三角形孔排列使得效率对偏振的依赖性较弱。用633和830 nm激光线测试的这些器件，相对于用作所研究分子测量参考的平坦金表面，显示出显著的拉曼增强因子，高达约6×10⁴ 。
