Plasmonic response of a random metasurface based on gold nano-islands in attenuated total reflectance configuration

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2023-10-05 DOI:10.1117/12.2677728

J. P. Cuanalo, Irving Gazga, I. Cosme-Bolanos, N. Korneev, Rebeca Lugo, Rubén Ramos, S. Mansurova

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Abstract

In this work, we investigate the plasmonic response of a random metasurface based on gold nano-islands (AuNI) in an attenuated total reflectance (ATR) configuration. AuNI structures were obtained by thermal annealing of an ultrathin gold film deposited on a glass substrate. The samples exhibited a wide range of sizes and particle densities, varying the nominal gold thickness. For p polarization, a well-defined localized surface plasmon resonance (LSPR) dip was observed in all samples, while for s polarization, only AuNI with the smallest radii showed this dip. Some samples exhibited nearly zero reflection at the resonance wavelength. The highest sensitivity among all tested samples was achieved in these samples, providing potential for optimizing LSPR transducers in sensing applications. Notably, the resonance wavelength exhibited a nonlinear dependence on the refractive index in sensitivity measurements displaying a blue shift.

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衰减全反射结构下基于金纳米岛的随机超表面的等离子体响应

在这项工作中，我们研究了基于金纳米岛(AuNI)的随机超表面在衰减全反射(ATR)配置下的等离子体响应。通过在玻璃衬底上沉积超薄金膜的热退火获得了aui结构。样品的尺寸和颗粒密度范围很广，标称金的厚度也有所不同。对于p极化，在所有样品中都观察到一个明确的局部表面等离子体共振(LSPR)倾角，而对于s极化，只有半径最小的AuNI有这种倾角。有些样品在共振波长处的反射几乎为零。在所有测试样品中，这些样品的灵敏度最高，为优化传感应用中的LSPR传感器提供了潜力。值得注意的是，共振波长表现出非线性依赖于折射率在灵敏度测量显示蓝移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)

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