Optical characterization of a chalcogenide glass nanophotonic device

In this paper, we have proposed a nonlinear photonic device and characterized linear and nonlinear optical properties from 1.5 μm to 5 μm using full vector finite element method. A sub-wavelength photonic wire inside a silica glass photonic crystal structure with an average index contrast ≈ 1.4 is found to maintain tight optical confinement at the peak operating wavelength. We have obtained a highly anomalous dispersion region starting from 1.76 μm to a maximum of 4.6 μm. A method to tune the upper zero GVD wavelength has been explored. Again, high anomalous dispersion of pure silica at longer wavelengths has been investigated for the first time. A nonlinearity parameter within the order of 10⁵ W^-1 Km^-1 also confirms low power mid-IR supercontinuum generation for a pumping wavelength in the short-wavelength infrared band.