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<p>We numerically investigated the supercontinuum (SC) generation process in a chalcogenide Ge<sub>20</sub>Sb<sub>5</sub>Se<sub>75</sub> suspended core photonic crystal fiber (SCF) with air holes filled with carbon disulfide (CS<sub>2</sub>). The influence of the ratio of the bridge width to the core radius (w/r<sub>c</sub>) on the dispersion characteristics of SCF was investigated for both x- and y-polarized modes, and the results were compared with those of an unfilled SCF. By optimizing the SCF geometry, a flat normal dispersion profile was achieved and used for SC studies in the considered wavelength range. The results show that when pumping a light source at 2&#xa0;μm with an input pulse of 0.084&#xa0;nJ and a width of 120&#xa0;fs into a 10&#xa0;cm fiber length, a SC spectrum spanning from 1 to 3&#xa0;μm can be generated. The broad spectrum makes it highly suitable for mid-infrared applications such as bio-imaging, optical coherence tomography, and sensing.</p>

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Supercontinuum generation in suspended core photonic crystal fibers made of Ge20Sb5Se75 with CS2 infiltration

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Tham Hong Tran,
  • Ben Chu Van,
  • Nam Nguyen Trong,
  • Lanh Chu Van

摘要

We numerically investigated the supercontinuum (SC) generation process in a chalcogenide Ge20Sb5Se75 suspended core photonic crystal fiber (SCF) with air holes filled with carbon disulfide (CS2). The influence of the ratio of the bridge width to the core radius (w/rc) on the dispersion characteristics of SCF was investigated for both x- and y-polarized modes, and the results were compared with those of an unfilled SCF. By optimizing the SCF geometry, a flat normal dispersion profile was achieved and used for SC studies in the considered wavelength range. The results show that when pumping a light source at 2 μm with an input pulse of 0.084 nJ and a width of 120 fs into a 10 cm fiber length, a SC spectrum spanning from 1 to 3 μm can be generated. The broad spectrum makes it highly suitable for mid-infrared applications such as bio-imaging, optical coherence tomography, and sensing.