Side-Polished Optical Fiber Grating-Based Refractive Index Sensors Utilizing the Pure Surface Plasmon Polariton
Side-Polished Optical Fiber Grating-Based Refractive Index Sensors Utilizing the Pure Surface Plasmon Polariton
复制标题
利用纯表面等离子体激元的侧面抛光光纤光栅折射率传感器
DOI：
10.1109/jlt.2007.913585
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发表时间：
2008
影响因子：
4.7
通讯作者：
J. Meunier
中科院分区：
文献类型：
--
作者：
S. Tripathi;A. Kumar;E. Marin;J. Meunier
在本文中，我们提出了基于纯表面等离子体激元激发的金属涂层侧面抛光光纤光栅的环境折射率（ARI）传感特性。针对不同的金属和残余包层厚度，获得了作为 ARI 函数的谐振波长偏移以及类 TM 模式的固定最小透射率 (30%) 所需的光栅长度。研究发现，基于长周期光栅 (LPG) 的传感器对 ARI 变化的敏感度大约是基于光纤布拉格光栅 (FBG) 的传感器的 5-20 倍，并且在给定灵敏度下需要更短的光栅长度。此外，与基于 FBG 的设备不同，基于 LPG 的传感器被发现在金属厚度的最佳值处具有最大灵敏度，其原因也得到了解释。本文应该在敏感光纤生物/化学传感器的设计中得到应用。
In this paper, we present the ambient refractive index (ARI) sensing characteristics of metal-coated side-polished optical fiber gratings based on the excitation of the pure surface plasmon polariton. The resonance wavelength shift as a function of the ARI and the grating lengths required for a fixed minimum transmittivity (30%) for the TM-like mode are obtained for different metal and residual cladding thicknesses. It is found that a long-period grating (LPG)-based sensor is about 5-20 times more sensitive to the change in the ARI and requires much shorter grating lengths for a given sensitivity than the one based on fiber Bragg grating (FBG). Further, unlike a FBG-based device, an LPG-based sensor is found to have maximum sensitivity at an optimum value of metal thickness, the reason for which is also explained. This paper should find application in the design of sensitive fiber-optic bio/chemical sensors.