Photonic crystal fiber (PCF) is widely used in sensing applications due to its structural flexibility, high birefringence, low confinement loss, and significant nonlinear effects. This study presents a novel design of a highly birefringent photonic crystal fiber with a core filled with carbon disulfide (CS₂). The simple structure of the fiber improves its manufacturability and performance by optimizing the number and shape of elliptical pores in the core. Using the finite element method (FEM) combined with perfectly matched layer (PML) boundary conditions, the birefringence, mode field area, and confinement loss were analyzed at different wavelengths. The results indicate that the newly designed fiber significantly outperforms existing liquid-sensing photonic crystal fibers, especially in the near-infrared region, making it a promising candidate for high-sensitivity applications.

Xuanjun He. Research of highly birefringent photonic crystal fibers based on elliptical core arrays. International Journal of Frontiers in Engineering Technology (2024), Vol. 6, Issue 5: 41-46. https://doi.org/10.25236/IJFET.2024.060506.

[1] ZHAO Lijuan, ZHAO Haiying, XU Zhiniu. Design of high sensitivity static pressure sensor based on Brillouin dynamic grating [J]. Journal of Photonics, 2021,50(02):29-44.

[2] Md. Faizul Huq Arif, Md. Jaminul Haque Biddut. A new structure of photonic crystal fiber with high sensitivity, high nonlinearity, high birefringence and low confinement loss for liquid analyte sensing applications [J]. Sensing and Bio-Sensing Research, 2017, 12(4): 8-14.

[3] LIU X Y, BIN Y, Li H S, et al. Highly sensitive sensor for simultaneous underwater measurement of salinity and temperature based on highly birefringent asymmetric photonic crystal fiber [J]. Results in Optics, 2023, 11:100406

[4] HOSSAIN M S, MOHAMMAD F. Theoretical Investigation of Mid Infrared Temperature Sensor Based on Sagnac Interferometer Using Chloroform Filled Photonic Crystal Fiber[J] IEEE sensors journal, 2021,21(21):24157-24165

[5] SUDHIR K, DILIP K. Lower index liquid chemical detection by using photonic crystal fiber sensor [J]. Materials Today: Proceedings, 2022, 64(1): 69-73.

[6] VAN B C, HAI T T, THAO N T, et al. Experimental study of supercontinuum generation in water-filledcladding photonic crystal fiber in visible and near-infrared region [J]. Optical and Quantum Electronics, 2023, 3(55):1-14.

[7] LI Yizhou, TAN Fang, LIU Runze, et al. Performance study of highly birefringent elliptical core-like rectangular arrangement photonic crystal fiber[J]. Journal of Changchun University of Science and Technology (Natural Science Edition), 2024,47(02):23-30.

[8] BRECHET F, JACQUES M, DOMINIQUE P, et al. Complete analysis of the characteristics of propagation into photonic crystal fibers, by the finite element method[J]. Optical Fiber Technology, 2000, 6:181-191.

[9] Wang G, An L .COMSOL Multiphysics Engineering Practice and Theoretical Simulation [M]. Beijing: Electronic Industry Press, 2012.

[10] Wang Chengcheng, Zhang Feng, Wu Genzhu . Asymptotic terahertz porous photonic crystal fiber mode characterization [J]. Laser Technology, 2019, 43(6):768-772.

[11] LIU Tiecheng, HU Jingpei, ZHU Linglin, et al. Experimental study of Sellmeier model characterizing the birefringence dispersion of hybrid liquid crystals[J]. China Laser, 2020, 47(08):155-160.

[12] Zhang R, Giessen H. Theoretical design of a liquid-core photonic crystal fiber for supercontinuum generation [J]. Opt. Express, 2006, 14:6800-6812.

[13] Rasoul Raei, Majid Ebnali-Heidari, Hamed Saghaei. Supercontinuum generation in organic liquid-liquid core-cladding photonic crystal fiber in visible and near-infrared regions[J]. J. Opt. Soc. Am. B, 2018, 35:323-330.