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首页> 外文期刊>Optics Letters >Femtosecond and nanosecond laser fabricated substrate for surface-enhanced Raman scattering
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Femtosecond and nanosecond laser fabricated substrate for surface-enhanced Raman scattering

机译：飞秒和纳秒激光制造的用于表面增强拉曼散射的衬底

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摘要

We report a simple and repeatable method for fabricating a large-area substrate for surface-enhanced Raman scattering. The substrate was processed by three steps: (i) femtosecond (fs) laser micromachining and roughening, (ii) thin-film coating, and (iii) nanosecond laser heating and melting. Numerous gold nanoparticles of various sizes were created on the surface of the silicon substrate. The 3D micro-anostructures generated by the fs laser provide greater surface areas with more nanoparticles leading to 2 orders of magnitude higher of the enhancement factor than in the case of a flat substrate. Using an He-Ne laser with a 632.8 nm excitation wavelength, the surface-enhanced Raman scattering enhancement factor for Rhodamine 6G was measured up to 2 X 10~(7).
机译：我们报告了一种简单且可重复的方法，用于制造用于表面增强拉曼散射的大面积基板。基板通过三个步骤进行处理：（i）飞秒（fs）激光微加工和粗糙化;（ii）薄膜涂层;以及（iii）纳秒激光加热和熔化。在硅衬底的表面上产生了许多各种大小的金纳米颗粒。由fs激光器产生的3D微米/纳米结构提供了更大的表面积和更多的纳米颗粒，从而导致增强因子比平坦基板高出2个数量级。使用激发波长为632.8 nm的He-Ne激光器，测量了若丹明6G的表面增强拉曼散射增强因子，直至2 X 10〜（7）。

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