Abstract
In this paper, we design a silicon-core photonic crystal fiber (PCF) composed of MgF2 background material to generate supercontinuum spectra in the near- and mid-infrared wavelength ranges. The linear properties of the PCF, including effective index, group velocity dispersion, loss, and effective area, as well as the nonlinear parameter, are calculated for several core radii. We show that by choosing the PCF's optimal geometric dimensions using the particle swarm optimization algorithm, high flatness and near-zero dispersion profile at the desired wavelength can be achieved. Numerical results reveal that by pumping 50 femtosecond optical pulses with a peak power of 1 kW centered at the wavelength of 2460 nm into the proposed optimized PCF, a spectrum with a spectral bandwidth of 2670 nm in the near- and mid-infrared wavelength ranges at 10-mm long PCF can be generated. Such a broad spectrum has many applications, especially in the production of highly sensitive optical sensors applicable in the medical, security, and petrochemical industries.
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