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提出了一种具有V形开口的三维纳米银圆管阵列结构,这种结构可被应用于折射率传感器中。利用时域有限差分法对V形开口纳米银圆管阵列的透射特性进行研究。结果表明:当入射光的电场偏振方向垂直于开口的方向时,在可见光和近红外波段的透射光谱上存在3个共振透射峰,分别对应着一个传导型表面等离子体共振(PSPR)模式和两个不同机理的局域表面等离子体共振(LSPR)模式。讨论了阵列周期、圆管直径、圆管高度和圆管顶部缝隙大小等参数对透射峰的波长以及半峰全宽(FWHM)的影响。通过调谐结构参数,优化V形开口纳米银圆管阵列的LSPR传感性能,得到最大高达13.2的品质因子。
A three-dimensional nano silver tube array structure with a V-shaped opening is proposed. This structure can be applied to a refractive index sensor. The time-domain finite difference method was used to study the transmission characteristics of V-shaped silver nanotube arrays. The results show that there are three resonant transmission peaks in the visible and near-infrared transmission spectrum when the polarization direction of the incident light is perpendicular to the opening, corresponding to a mode-guided surface plasmon resonance (PSPR) mode and two Different Localized Surface Plasmon Resonance (LSPR) Modes. The effects of parameters such as array period, tube diameter, tube height and tube top gap on the transmission peak wavelength and full width at half maximum (FWHM) were discussed. By tuning the structural parameters and optimizing the LSPR sensing performance of the V-shaped silver nanotube array, a quality factor of up to 13.2 was obtained.