A dual-diamond-ring photonic crystal fiber (PCF)-based sensor is proposed and analyzed herein for the detection of the concentration of alcohol in aqueous solution. Commercially available finite element method (FEM)-based simulation software (COMSOL Multiphysics^® version 4.3b) is utilized to conduct a rigorous numerical investigation. The sample is injected inside the fiber. Several crucial optical parameters such as the index difference, coupling length, transmission spectrum, peak wavelength shift, and sensitivity are studied while ensuring an anisotropic perfectly matched layer (A-PML) for X and Y polarization, respectively. The results indicate that the coupling length strongly depends on the concentration of the solution. Moreover, maximum sensitivities for the X and Y polarization of 6166 nm/RIU and 6000 nm/RIU, respectively, are found from the computational model. Based on this outstanding performance, it can be anticipated that practical implementation of such sensors would open a new horizon in the area of biomedical or clinical sensing.

中文翻译：

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基于双金刚石环PCF的传感器的设计与分析

本文提出了一种基于双金刚石环光子晶体光纤（PCF）的传感器，并对其进行了分析，以检测水溶液中酒精的浓度。可商购的有限元法（FEM）为基础的模拟软件（COMSOL Multiphysics的^®版本4.3B）被用来进行严格数值研究。样品被注入纤维内部。在确保X和Y的各向异性完美匹配层（A-PML）的同时，研究了几个关键的光学参数，例如折射率差，耦合长度，透射光谱，峰值波长偏移和灵敏度。极化。结果表明，偶联长度在很大程度上取决于溶液的浓度。此外，从计算模型中发现X和Y偏振的最大灵敏度分别为6166 nm / RIU和6000 nm / RIU。基于这种出色的性能，可以预见，这种传感器的实际应用将为生物医学或临床传感领域开辟新的视野。