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Near-Infrared Surface-Enhanced Raman Scattering on Silver-Coated Porous Silicon Photonic Crystals

机译:涂银多孔硅光子晶体上的近红外表面增强拉曼散射

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摘要

Surface-enhanced Raman scattering (SERS) with near-infrared (NIR) excitation offers a safe way for the detection and study of fragile biomolecules. In this work, we present the possibility of using silver-coated porous silicon photonic crystals as SERS substrates for near-infrared (1064 nm) excitation. Due to the deep penetration of NIR light inside silicon, the fabrication of photonic crystals was necessary to quench the band gap photoluminescence of silicon crystal, which acts as mechanical support for the porous layer. Optimal parameters of the immersion plating process that gave maximum enhancement were found and the activity of SERS substrates was tested using rhodamine 6G and crystal violet dye molecules, yielding significant SERS enhancement for off-resonant conditions. To our knowledge, this is the first time that the 1064 nm NIR laser excitation is used for obtaining the SERS effect on porous silicon as a substrate.
机译:具有近红外(NIR)激发的表面增强拉曼散射(SERS)为检测和研究易碎生物分子提供了一种安全的方法。在这项工作中,我们提出了使用镀银的多孔硅光子晶体作为SERS衬底进行近红外(1064 nm)激发的可能性。由于近红外光在硅内部的深入渗透,因此有必要制造光子晶体来淬灭硅晶体的带隙光致发光,从而为多孔层提供机械支撑。发现浸镀工艺的最佳参数可以最大程度地增强效果,并使用罗丹明6G和结晶紫染料分子对SERS底物的活性进行了测试,从而在非共振条件下产生了显着的SERS增强。据我们所知,这是第一次使用1064 nm NIR激光激发来获得对作为衬底的多孔硅的SERS效应。

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