Numerical analysis of a highly nonlinear microstructured optical fiber with air-holes arranged in spirals

Abstract

• A spiral shape photonic crystal fiber deposition has been designed for nonlinear applications. • Numerical simulation proves that the proposed work gives the extremely high nonlinear coefficient. • It simultaneously offers a desirable optical property of numerical aperture. • The outcome indicates that the proposed PCF is few times more effective than the earlier reported fiber. • A strong candidate in supercontinuum generation and biomedical imaging applications. A spiral shape photonic crystal fiber (S-PCF) deposition with silicon nanocrystal has been designed for nonlinear applications. Full vector finite element method (FV-FEM) based commercially available software COMSOL Multiphysics® version 4.2 has been used here to investigate some essential optical characteristics. Numerical simulation proves that the proposed work gives the extremely high nonlinear coefficient of 2.28 × 10 5 W −1 km −1 and 2.56 × 10 5 W −1 km −1 for the X and Y polarization respectively, at wavelength λ = 1.00 µm. Moreover, it simultaneously offers a desirable optical property of numerical aperture (NA) of 0.54 and 0.56 at the same electromagnetic (EM) wave. The outcome indicates that the proposed PCF is approximately a few times more effective than the earlier reported fiber designs. The proposed PCF designed with circular shape holes and geometrical rhythms which remains enormously convenient in fabrication. This PCF structure provides a way to get the high nonlinearity with NA at the same time, which can find extensive applications in the optical signal processing as well as medical imaging.