1.Department of Electronic and Communication Engineering， North China Electric Power University， Baoding 071003， China;2.Hebei Key Laboratory of Power Internet of Things Technology， North China Electric Power University， Baoding 071003， China;3.Baoding Key Laboratory of Optical fiber sensing and optical communication Technology， North China Electric Power University， Baoding 071003， China;4.School of Electrical and Electronic Engineering， North China Electric Power University， Baoding 071003， China
Supported by the National Natural Science Foundation of China （ 61775057， 62171185）， the Natural Science Foundation of Hebei Province， China （ E2020502010， E2019502177）， the Fundamental Research Funds for the Central Universities （ 2019MS085， 2021MS072），S & T Program of Hebei （SZX2020034）.
A novel photonic crystal fiber with high birefringence and low confinement loss is designed， which can be used for chemical sensing . The effects of air holes parameters on optical properties of optical fiber are systematically investigated. The results reveal that the relative sensitivities of the fiber with the optimal structure for water， ethanol and benzene at the wavelength of 1.55 μm are 56.3%， 59.9% and 62.5%， respectively. Compared with the existing PCFs， they are improved by 1.05-6.25 times， 1.05-4.99 times and 1.03-4.63 times， respectively. Besides， it has excellent transmission characteristics. Therefore， the proposed photonic crystal fiber has advantages in chemical sensing and biomedicine filed.
ZHAO Li-Juan, ZHAO Hai-Ying, XU Zhi-Niu, LIANG Ruo-Yu. Design of a diagonally symmetrical photonic crystal fiber for chemical sensing[J]. Journal of Infrared and Millimeter Waves,2022,41(1):232~241Copy