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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Polarized interference imaging of dense disordered plasmonic nanoparticle arrays for biosensor applications
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Polarized interference imaging of dense disordered plasmonic nanoparticle arrays for biosensor applications

机译：用于生物传感器应用的致密无序等离子体纳米颗粒阵列的偏振干涉成像

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摘要

We report on light scattering by dense short-range ordered gold and silver nanoparticle arrays with 25 nm diameter and 50 nm center separation produced by masked deposition through anodized aluminum oxide membranes. Local resonant regions are formed, which scatter light with polarization components perpendicular to the incident wave due to electromagnetic coupling between particles at random angles. The observed cross-polarized far-field images have a granular structure that morphs in response to environmental variations in the article near field. We quantify the changes in the recorded images by 2D correlation matrix calculation and demonstrate the application of this approach to biomolecular sensing by using various concentrations of cysteine solution as a model system. The presented method may potentially compete with colorimetric sensor techniques since the detection setup does not require any spectroscopic instruments.
机译：我们通过密集的短程有序金和银纳米粒子阵列的光散射进行了报告，该阵列具有通过阳极氧化铝膜进行掩膜沉积产生的25 nm直径和50 nm中心间隔。形成了局部谐振区域，该区域由于粒子之间以随机角度进行电磁耦合而散射了偏振分量垂直于入射波的光。观察到的交叉极化远场图像具有颗粒状结构，该结构会响应物品近场中的环境变化而变形。我们通过二维相关矩阵计算来量化所记录图像的变化，并通过使用各种浓度的半胱氨酸溶液作为模型系统来证明该方法在生物分子传感中的应用。由于检测设置不需要任何光谱仪器，因此提出的方法可能会与比色传感器技术竞争。

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