Department of Electrical and Computer Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA.
Nanotechnology. 2012 Dec 14;23(49):495201. doi: 10.1088/0957-4484/23/49/495201. Epub 2012 Nov 16.
We demonstrate strong electromagnetic field enhancement from nano-gaps embedded in silver gratings for visible wavelengths. These structures fabricated using a store-bought HD-DVD worth $10 and conventional micro-contact printing techniques have shown maximum fluorescence enhancement factors of up to 118 times when compared to a glass substrate under epi-fluorescent conditions. The novel fabrication procedure provides for the development of a cost-effective and facile plasmonic substrate for low-level chemical and biological detection. Electromagnetic field simulations were also performed that reveal the strong field confinement in the nano-gap region embedded in the silver grating, which is attributed to the combined effect of localized as well as propagating surface plasmons.
我们展示了嵌入在银光栅中的纳米间隙在可见光波长下产生的强电磁场增强。这些结构使用价值 10 美元的市售 HD-DVD 和常规微接触印刷技术制造，与荧光条件下的玻璃基板相比，在荧光增强因子方面最大可提高 118 倍。这种新颖的制造工艺为低成本、简便的等离子体基化学和生物检测提供了一种方法。我们还进行了电磁场模拟，结果表明在嵌入银光栅的纳米间隙区域存在强场限制，这归因于局域和传播表面等离子体的综合效应。
