Supercontinuum generation in C6H5NO2-core photonic crystal fibers with various air-hole size.

In this paper, we demonstrated the ability of a hexagonal photonic crystal fiber (PCF) with a hollow core infiltrated with nitrobenzene (C₆H₅NO₂) to generate a broad SC spectrum at low peak powers. Due to the non-uniformity of the air hole diameters, our new design allows for simultaneous optimization of features, resulting in near-flat, near-zero dispersion, a small effective mode area, and low attenuation for efficient spectral broadening. We selected two optimal structures from the simulation results to analyze the nonlinear properties and supercontinuum generation. The first fiber, #HF₁, with a lattice constant of 1.0 μ m and a filling factor of 0.45, operates in all-normal dispersion and produces spectral SC ranging from 0.81 μ m to 1.919 μ m with a pump wavelength of 1.56 μ m, a pulse duration of 90 fs, and peak power of 0.133 kW propagated in a 1 cm fiber length. The #HF₂ fiber (lattice constant of 2.0 μ m, filling factor of 0.3) has an extended SC spectrum from 0.792 μ m to 3.994 μ m, a pump wavelength of 1.55 μ m, a pulse width of 110 fs, a peak power of 0.273 kW propagated in a 15 cm fiber length. The proposed fiber may be a new-generation optical fiber suitable for low-peak power all-fiber optical systems to replace glass-core glass fiber. [ABSTRACT FROM AUTHOR]