As the research work in surface plasmon resonance (SPR)-based photonic crystal fiber (PCF) is getting tighter, a perfectly circular-shaped PCF with elliptical air holes is proposed where the performance parameters are improved significantly. The performances among our designed elliptical, circular, and rectangular air holes are compared, and the best result is achieved with the elliptical air holes. The technique used for the investigation is the finite element method, and for the simulation of data COMSOL Multiphysics 5.3a software is used. The method covers a wider range of the optical spectrum from 0.59 to 1.05 mu m. The highest confinement loss achieved through our design is 340 dB/cm. The wavelength sensitivity and amplitude sensitivity are 13,000nm/RIU and 1189.46 RIU-1, respectively. The sensor resolution is 7.69 x 10(-6) for our proposed design. The proposed sensor also achieved a maximum birefringence of 2.8 x 10(-3), which is, to our knowledge, the highest birefringence reported so far for a PCF-SPR sensor. This enables the fiber to be operated in a dual-polarized mode. The RI for the analyte ranges from 1.33 to 1.40. Based on all the characteristics, the proposed PCF structure can be used effectively for chemical and biomolecular sensing. (C) 2020 Optical Society of America
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机译：随着在表面等离子体共振（SPR）的研究工作中，基于光子晶体纤维（PCF）越来越紧，提出了具有椭圆形空气孔的完全圆形的PCF，其中性能参数显着提高。比较我们设计的椭圆形，圆形和矩形空气孔之间的性能，并且通过椭圆空气孔实现了最佳结果。用于调查的技术是有限元方法，并且对于数据的仿真，使用COMSOL MultihySics 5.3a软件。该方法涵盖从0.59至1.05μm的光谱范围的更宽范围。通过我们设计实现的最高限制损失是340 dB / cm。波长灵敏度和幅度灵敏度分别为13,000nm / RiU和1189.46 RIU-1。对于我们提出的设计，传感器分辨率为7.69 x 10（-6）。所提出的传感器还实现了2.8×10（-3）的最大双折射，这是我们的知识，到目前为止报告的PCF-SPR传感器的最高双折射。这使得光纤能够以双极化模式操作。分析物的RI范围为1.33至1.40。基于所有特性，所提出的PCF结构可有效用于化学和生物分子感测。 （c）2020美国光学学会
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