In the proposed work, a two-dimensional photonic crystal fiber (PCF) based on the surface plasmon resonance (SPR) refractive index sensor has been demonstrated and designed which is so much helpful to gain a better sensitivity response in urine observation. In order to detect the pregnancy, the simulation and analysis have been performed in both normal and pregnant urine with the effective refractive indices values of 1.335, 1.34, 1.342 and 1.343 within the range of working wavelength from 1.75 µm to 2 µm. From this testing sensor, the optical parameters of the dispersion relation, birefringence, coupling length, confinement loss, insertion loss, sensor length, crosstalk, sensitivity response, resonance wavelength, resolution, and sensitivity per line-width have been analyzed. Besides, Finite element method (FEM) is used for the numerical investigations. From this investigation, the highest value of sensitivity response, sensitivity per line-width, and the resolution of 68051.344 nm/RIU, 314 RIU⁻¹, and 9.39 × 10⁻⁶ RIU are gained. It is noted that the proposed sensor offers significant sensing performances for the polarized modes. The main goal of this investigation is to develop the concepts of optoelectronics and laser bio-sensor in the field of biological detection systems. As a result, this structure of optical biosensor will be applicable through the modified optical fiber in biological changes.

在提出的工作中，已经证明并设计了基于表面等离振子共振（SPR）折射率传感器的二维光子晶体光纤（PCF），它对在尿液观察中获得更好的灵敏度响应非常有帮助。为了检测怀孕，已经在正常和怀孕的尿液中进行了模拟和分析，其有效折射率值在1.75 µm至2 µm的工作波长范围内，分别为1.335、1.34、1.342和1.343。从该测试传感器分析了色散关系，双折射，耦合长度，限制损耗，插入损耗，传感器长度，串扰，灵敏度响应，共振波长，分辨率和每线宽灵敏度的光学参数。除了，有限元方法（FEM）用于数值研究。从这项调查中，灵敏度响应，每线宽灵敏度和分辨率为68051.344 nm / RIU，314 RIU的最大值^-1和9.39×10 ^-6 RIU被获得。注意，所提出的传感器为偏振模式提供了显着的感测性能。这项研究的主要目的是在生物检测系统领域开发光电和激光生物传感器的概念。结果，光学生物传感器的这种结构将可通过修饰的光纤应用于生物变化。