Bài báo khoa học

In this research, we used the full-vectorial finite difference method for comparing the linear and nonlinear characteristics in the square lattice of solid-core PCFs using different substrates (Ge20Sb5Se75 and As2S3). It has been demonstrated that most of the optimized As2S3- PCFs are superior in dispersion properties due to possessing near-zero flattened dispersion curves in the case of all-normal dispersion and anomalous dispersion with two zero-dispersion wavelengths (ZDWs). Particularly, the Ge20Sb5Se75-PCF with one ZDW is designed to achieve an ultra-flat dispersion in the wavelength range of 5-9 μm. It is also shown that all As2S3 glass PCFs provide much lower confinement loss compared to fibers based on Ge20Sb5Se75 of the same structure. The light intensity in the cores of the latter is large and hence, the nonlinear effects become more obvious. The proposed PCFs have high potential in mid-infrared supercontinuum generation.