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首页> 外文期刊>Optical fiber technology >Sensitivity increasing in plasmonic optical sensor with (Au-SiO_2) aperture arrays on a Bragg fiber endface
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Sensitivity increasing in plasmonic optical sensor with (Au-SiO_2) aperture arrays on a Bragg fiber endface

机译：布拉格光纤端面上具有（Au-SiO_2）孔径阵列的等离激元光学传感器的灵敏度提高

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摘要

In this paper, we theoretically demonstrate a sensitivity increasing in the plasmonic optical sensor (POS) with (Au-SiO2) aperture arrays on a core-cladding (C-C) cylindrical Bragg fiber endface based on the extraordinary optical transmission (EOT) property. Numerical investigations show that the design of C-C Bragg fiber significantly affects the sensitivity enhancement due to Fresnel reflection compared with C-C fiber by using a mode analysis approach. The essential parameters including the thickness of Au and SiO2, the refractive index (RI) as well as its width of a torus in the fiber cladding and the gap between two adjacent tori, which affect the EOT, are discussed and optimized. A high average sensitivity of 284 +/- 5 nm/RIU of the POS in the sensing range 1.30-1.42 with high linearity is achieved for the peak wavelength interrogation. It is demonstrated that a significant sensitivity increases in the proposed POS (the thickness is 100 nm, the RI is 1.5, the width is 20 nm and the gap is 50 nm) up to 219 arbitrary units (similar to 337%), which is clearly observed more than that of C-C fiber. The averaged figure of merit (FOM) of the proposed POS is calculated to be 5.2 RIU-1. Our findings hold potential applications in designing and optimizing a high-performance POS.
机译：在本文中，我们从理论上论证了基于非凡的光学传输（EOT）特性，在芯-覆层（C-C）圆柱形布拉格光纤端面上具有（Au-SiO2）孔径阵列的等离激元光学传感器（POS）可以提高灵敏度。数值研究表明，与使用C-C光纤的模式分析方法相比，C-C布拉格光纤的设计显着影响了菲涅耳反射引起的灵敏度提高。讨论并优化了影响Au的基本参数，包括Au和SiO2的厚度，折射率（RI）及其在光纤包层中的圆环的宽度以及两个相邻的Tori之间的间隙，这些均影响EOT。对于峰值波长询问，在高灵敏度范围内的POS范围1.30-1.42中实现了POS的284 +/- 5 nm / RIU的高平均灵敏度。结果表明，所提出的POS的灵敏度显着提高（厚度为100 nm，RI为1.5，宽度为20 nm，间隙为50 nm），最多可扩展到219个任意单位（约337％）。显然比CC光纤观察到的更多。提议的POS的平均品质因数（FOM）计算为5.2 RIU-1。我们的发现对设计和优化高性能POS具有潜在的应用价值。

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