用于表面增强拉曼光谱的导模共振耦合等离子体活性二氧化硅纳米管
Guided-mode-resonance-coupled plasmonic-active SiO(2) nanotubes for surface enhanced Raman spectroscopy.
作者信息
Xu Xiaobin, Hasan Dihan, Wang Lei, Chakravarty Swapnajit, Chen Ray T, Fan D L, Wang Alan X
出版信息
Appl Phys Lett. 2012 May 7;100(19):191114-1911145. doi: 10.1063/1.4714710. Epub 2012 May 10.
Abstract
We demonstrate a surface enhanced Raman scattering (SERS) substrate by integrating plasmonic-active SiO(2) nanotubes into Si(3)N(4) gratings. First, the dielectric grating that is working under guided mode resonance (GMR) provides enhanced electric field for localized surface plasmon polaritons on the surface of metallic nanoparticles. Second, we use SiO(2) nanotubes with densely assembled silver nanoparticles to provide a large amount of "hot spots" without significantly damping the GMR mode of the grating. Experimental measurement on Rhodamine-6G shows a constant enhancement factor of 8 ∼ 10 in addition to the existing SERS effect across the entire surface of the SiO(2) nanotubes.
摘要
我们通过将具有等离子体活性的SiO₂纳米管集成到Si₃N₄光栅中来展示一种表面增强拉曼散射（SERS）基底。首先，在导模共振（GMR）下工作的介质光栅为金属纳米颗粒表面的局域表面等离子体激元提供增强电场。其次，我们使用带有密集组装银纳米颗粒的SiO₂纳米管来提供大量“热点”，而不会显著阻尼光栅的GMR模式。对罗丹明-6G的实验测量表明，除了在SiO₂纳米管整个表面上现有的SERS效应外，增强因子恒定为8 ∼ 10。
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