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Efficient biosensing through 1D silver nanostructured devices using plasmonic effect

机译：使用等离子体效应高效通过1D银纳米结构装置的生物传感器

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The current work explores the excitation of surface plasmon polaritons (SPPs) on a one dimensional (1D) silver nano-grating device, simulated on glass substrate, which can sense a very small change in the refractive index of an analyte adjacent to it. The most recent modeling technique finite element analysis is applied in this work by using a COMSOL RF module. The models of 1D grating devices of different slit widths with fixed periodicity and film thickness are simulated. The data is collected and then used to study higher refractive index unit per nanometer (RIU/nm) as well as the effect of the widths of the slits on the RIU. A number of investigations are done by the simulated data, like a dip in the transmission spectra of p-polarized light. This dip is due to SPP resonance with the variation of slit width. Furthermore, the most fascinating part of the research is the COMSOL modeling that provides an opportunity to look into factors affecting higher RIU/nm, while visualizing the cross-sectional view of the grating device and strong electric field enhancement at the surface of the metallic device. When the slit width is almost equal to half of the periodicity of the grating device, SPP resonance increases and it is at maximum for the slit width equal to two-thirds of the periodicity, because the coupling efficiency is at maximum.
机译：目前的工作探讨了在玻璃基板上模拟的一维（1D）银纳米光栅装置上的表面等离子体（SPP）的激发，这可以感测与其相邻的分析物的折射率的非常小的变化。通过使用COMSOL RF模块，在这项工作中应用了最新的建模技术有限元分析。模拟具有固定周期性和膜厚度的不同狭缝宽度的1D光栅装置的模型。收集数据，然后用于研究每个纳米（RIU / NM）的较高折射率单元以及狭缝在RIU上的宽度的效果。通过模拟数据完成许多调查，例如在P偏振光的透射光谱中的倾角。该倾角是由于SPP谐振，狭缝宽度的变化。此外，该研究中最令人迷人的部分是COMSOL建模，提供了一种机会，用于调查影响更高的RIU / NM的因素，同时可视化光栅装置的横截面图和金属装置表面的强电场增强。当狭缝宽度几乎等于光栅装置的周期性的一半时，SPP谐振增加，并且最大限度地，狭缝宽度等于周期性的三分之二，因为耦合效率最大。

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