Design and characterization of a novel spiral photonic crystal fiber nanowire for visible range applications

In this paper, we have proposed a novel nanophotonic device for nonlinear applications in the visible range. The proposed device is a photonic crystal fiber nanowire composed of highly transparent silica with a germania doped silica as core material. Numerical analysis has confirmed that the proposed nonlinear device has a maximum Raman gain coefficient of 1324 W^-1km^-1 with a nonlinearity parameter of 1144 W^-1km^-1. Again, the ultra-flattened dispersion slope of -0.0038 ps/nm²-km obtained at wavelength ≈ 584 nm has also validated the efficiency of dispersion control mechanism of the newly proposed spiral photonic crystal fiber structure for nonlinear applications. Later, tunability of Raman effective area and Raman interaction length has been investigated for the proposed nanowire based device in the flat dispersion region.