Enhancing Surface Plasmon Detection Using Template-Stripped Gold Nanoslit Arrays on Plastic Films
Enhancing Surface Plasmon Detection Using Template-Stripped Gold Nanoslit Arrays on Plastic Films
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DOI：
10.1021/nn3001142
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发表时间：
2012-04-01
期刊：
影响因子：
17.1
通讯作者：
Wei, Pei-Kuen
中科院分区：
文献类型：
--
作者：
Lee, Kuang-Li;Chen, Pei-Wen;Wei, Pei-Kuen
基于纳米结构的传感器能够在生物医学应用中进行灵敏和无标签的检测。然而，高通量和低成本的制造技术是需要解决的主要问题。在这项研究中，基于芯片的纳米结构用于强度敏感检测，并使用热退火辅助模板剥离方法进行测试。在塑料薄膜上制备了周期为500 cm、缝宽为30 ~ 165 nm的大面积均匀纳米狭缝阵列。在这些金纳米结构中，横向磁极化波在透射光谱中产生了尖锐的不对称法诺共振。半最大带宽下的全宽度随着狭缝宽度的减小而减小。最窄带宽小于10 nm。与采用电子束光刻技术的玻璃基板上的纳米狭缝阵列相比，该芯片具有更高的光强灵敏度，最高可达10367%/RIU（折射率单位），并达到高达55的品质值。模板剥离纳米结构具有较高的强度灵敏度，这主要归功于其光滑的金表面和更大的塑料薄膜颗粒尺寸，从而减少了表面等离子体传播损失。
Nanostructure-based sensors are capable of sensitive and label-free detection for biomedical applications. However, high-throughput and low-cost fabrication techniques are the main Issues which should be addressed. In this study, chip-based nanostructures for intensity-sensitive detection were fabricated and tested using a thermal-annealing-assisted template-stripping method. Large-area uniform nanoslit arrays with a 500 cm period and various slit widths, from 30 to 165 nm, were made on plastic films. A transverse magnetic-polarized wave In these gold nanostructures generated sharp and asymmetric Fano resonances In transmission spectra. The full width at half-maximum bandwidth decreased with the decrease of the slit width. The narrowest bandwidth was smaller than 10 nm. Compared to nanoslit arrays on glass substrates using electron-beam lithography, the proposed chip has a higher intensity sensitivity up to 10367%/RIU (refractive index unit) and reaches a figure of merit up to 55. The higher intensity sensitivity for the template-stripped nanostructure is attributed to a smoother gold surface and larger grain sizes on the plastic film, which reduces the surface plasmon propagation loss.