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首页> 外文期刊>Plasmonics >Tunable Plasmonic Resonances in the Hexagonal Nanoarrays of Annular Aperture for Biosensing
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Tunable Plasmonic Resonances in the Hexagonal Nanoarrays of Annular Aperture for Biosensing

机译：环形孔六角形纳米阵列中的可调谐等离子体共振，用于生物传感

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摘要

In this paper, we demonstrate a nanostructure sensor based on hexagonal arrays of annular aperture operating in the near-infrared wavelength range. The strong coupling interaction between propagating surface plasmons (PSP) mode and localized surface plasmons (LSP) mode in the designed structure generates two sharp spectral features under normal incidence. The mode coupling strongly enhances the electromagnetic fields and increases the interaction volume of the analyte and optical field. A high refractive index sensitivity of 623 nm/RIU is demonstrated in a wide refractive index range of 1.33 to 1.40. Due to the excitation of sharp spectral feature, as narrow as 7 nm, high figure of merits of 93 was obtained in the refractive index range, which is nearly 10 times larger than that from hole arrays and disk arrays. Furthermore, sharp spectral feature in the designed structure provides more error margin for structure parameters, which is advantageous for experimental realization of systems without requiring challenging fabrication resolution. The sensor is promising for biosensing applications with high sensitivity and low limit of detection.
机译：在本文中，我们演示了一种基于在近红外波长范围内运行的环形孔径的六边形阵列的纳米结构传感器。在设计的结构中，传播的表面等离子体激元（PSP）模式与局部表面等离子体激元（LSP）模式之间的强耦合相互作用在法向入射下产生两个尖锐的光谱特征。模耦合极大地增强了电磁场，并增加了分析物与光场的相互作用量。在1.33至1.40的宽折射率范围内，证明了623 nm / RIU的高折射率灵敏度。由于激发了窄至7 nm的尖锐光谱特征，在折射率范围内获得了93的高品质因数，几乎是孔阵列和圆盘阵列的10倍。此外，在设计的结构中清晰的光谱特征为结构参数提供了更多的误差容限，这有利于系统的实验实现而无需挑战制造分辨率。该传感器具有高灵敏度和低检测限，有望用于生物传感应用。

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