Highly nonlinear liquid-filled photonic crystal fibers

In this paper, we theoretically studied optical properties of hollow-core photonic crystal fibers when the core filled with highly nonlinear liquids. Using finite difference time domain (FDTD) method, we designed carbon-disulfide-filled fibers with nonlinear coefficients larger than 7500 W^-1.Km^-1, adjustable flattened dispersion with variation between ± 0.9 ps/(nm.km) and nearly-zero confinement loss of 0.007 dB/km and total loss lower than 0.3 dB/m over C-band. The proposed fibers can have important applications in all-optical nonlinear processes (such as wavelength conversion based on four-wave mixing and also slow light generation) which need high nonlinearity, flattened dispersion and respectable amount of loss.