Heterostructures comprising two-dimensional (2D) materials have attracted increasing attention in recent years due to their unique properties. Here, a 2D black phosphorous (BP)/MXene (Ti₃C₂) heterostructure is prepared by stacking BP and Ti₃C₂ using van der Waals forces. Ultraviolet–visible absorption spectra proved the excellent stability of the heterostructure in water and air. In addition, strong nonlinear properties (high modulation depth with small saturation intensity) are demonstrated through Z-scan measurements, indicating that the BP/Ti₃C₂ heterostructure has excellent potential as an optical switch. To illustrate the applicability of the BP/Ti₃C₂ heterostructure ultrafast photonics, its performance as a saturable absorber in an Er-doped mode-locked fiber laser is demonstrated, resulting in a 735 fs pulse duration at a center wavelength of 1559.8 nm. Furthermore, harmonic mode-locking was also achieved by increasing the pump power, yielding a peak repetition rate of 588 MHz. These results reveal that 2D BP/Ti₃C₂ heterostructures have significant potential application in ultrafast photonics.

近年来，包含二维（2D）材料的异质结构因其独特的性能而受到越来越多的关注。在此，通过使用范德华力堆叠BP和Ti ₃ C ₂来制备2D黑色磷（BP）/ MXene （ Ti ₃ C ₂）异质结构。紫外可见吸收光谱证明了水和空气中异质结构的出色稳定性。此外，通过Z扫描测量证明了强大的非线性特性（高调制深度，饱和强度很小），表明BP / Ti ₃ C ₂异质结构具有作为光开关的出色潜力。为了说明BP / Ti的适用性证明了₃ C ₂异质结构超快光子，其在掺Er锁模光纤激光器中作为可饱和吸收体的性能，在1559.8 nm的中心波长处产生了735 fs的脉冲持续时间。此外，还可以通过增加泵浦功率来实现谐波锁模，从而产生588 MHz的峰值重复频率。这些结果表明，二维BP / Ti ₃ C ₂异质结构在超快光子学中具有重要的潜在应用。