A novel mid-infrared Ge₂₀Sb₁₅Se₆₅ chalcogenide-based single-polarization single-mode (SPSM) photonic crystal fiber (PCF) with rectangular latticed circular air holes is proposed. The properties of SPSM bandwidth, confinement loss, and nonlinearity are analyzed in the 3 μm~8 μm mid-infrared region using the finite -difference time-domain (FDTD) method. The influences of different geometrical parameters on the properties of SPSM-PCF are analyzed. All numerical computational results reveal that for the optimized geometrical parameters, the proposed PCF can deliver a SPSM region of more than 2.3814 μm with high nonlinearity of 3,705 w⁻¹ km⁻¹. Therefore, such a SPSM-PCF will become an excellent candidate for mid-infrared photonic.

提出了一种新型的具有矩形格子状圆形气孔的中红外Ge ₂₀ Sb ₁₅ Se ₆₅硫族化物基单偏振单模（SPSM）光子晶体光纤（PCF）。利用时域有限差分法（FDTD）分析了3μm〜8μm中红外区域的SPSM带宽，约束损耗和非线性。分析了不同几何参数对SPSM-PCF性能的影响。所有数值计算结果表明，对于优化的几何参数，所提出的PCF可以提供大于2.3814μm的SPSM区域，并具有3,705 w ^-1  km ^-1的高非线性。因此，这种SPSM-PCF将成为中红外光子的极佳候选者。