Design and numerical analysis of large negative dispersion and ultra-high nonlinearity CS_2 filled LCPCF

Through filling CS _2 into the core, a liquid-core photonic crystal fiber(LCPCF) with a fully circular air hole structure was designed. The finite element method(FEM) and numerical analysis are combined to simulate the structure and optimize the parameters of the fiber. When λ =1550 nm ,the geometric optimal parameters are Λ =0.75 m, d _1/Λ =0.86 , d _2/Λ =0.96 , and d _3/Λ =0.20 . Meanwhile, the LCPCF can achieve a large negative dispersion of -2697.06 ps/nm/km and a high nonlinearity of 50677.77 W ^-1 km ^-1 . The numerical aperture and light acceptance are 0.674 and 65.37