Theory of Multiple Scattering Enhanced Single Particle Plasmonic Sensing
Theory of Multiple Scattering Enhanced Single Particle Plasmonic Sensing
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DOI：
10.1021/acsphotonics.1c00725
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发表时间：
2021-07-19
期刊：
影响因子：
7
通讯作者：
Foreman, Matthew R.
中科院分区：
文献类型：
--
作者：
Berk, Joel;Foreman, Matthew R.
增加小颗粒散射光的方法可以帮助提高许多传感技术的灵敏度。在这里，我们研究了当粒子被添加到随机散射环境中时，多次散射在扰动散射信号中所起的作用。引入了三种增强因子，它们描述了不同类型的多重散射轨迹对场扰动的影响，并在表面等离子激元散射的背景下对它们的平均幅度进行了数值研究。我们证明了存在一个最佳的散射体密度，在该密度下灵敏度增强是最大的，其因子约为10(2)。研究了增强因子与散射体性质的关系。
Methods to increase the light scattered from small particles can help improve the sensitivity of many sensing techniques. Here, we investigate the role multiple scattering plays in perturbing the scattered signal when a particle is added to a random scattering environment. Three enhancement factors, parametrizing the effect of different classes of multiple scattering trajectories on the field perturbation, are introduced and their mean amplitudes explored numerically in the context of surface plasmon polariton scattering. We demonstrate that there exists an optimum scatterer density at which the sensitivity enhancement is maximized, with factors on the order of 10(2) achievable. Dependence of the enhancement factors on scatterer properties are also studied.