Control of lasing properties through tailorable and dynamically tunable materials and reconfigurable compositions can augment the performance of random lasers for a wide range of applications. Here, a colloid of randomly dispersed weakly scattering single-layer titanium carbide (Ti₃C₂T_x) MXene flakes embedded within rhodamine 101 gain medium is experimentally shown to provide feedback for random lasing. Additionally, in contrast to previously reported random laser systems where the optical properties of scatterers are static, the relative permittivity of Ti₃C₂T_x MXene flakes can be varied under optical pumping due to the saturable absorption properties. Numerical simulations indicate that the observed nonlinear response of Ti₃C₂T_x MXene flakes enables dynamically tunable random lasing. Thus, pumping the Ti₃C₂T_x MXene flakes with a second optical source decreases the gain threshold required to obtain random lasing. Also, using numerical simulations, it is shown that the control over the intensity of the second pump enables tuning the field distribution of the random lasing modes. Considering the diversity of the MXenes family, the proposed MXene colloidal metamaterial design opens up a new avenue to advanced control of lasing properties for photonic applications.

中文翻译：

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胶体碳化钛MXene的动态控制随机激射

通过可定制和动态可调的材料以及可重新配置的成分来控制激光特性，可以提高随机激光器在各种应用中的性能。在此，实验显示了嵌入罗丹明101增益介质中的，随机分散的微分散的单层碳化钛（Ti ₃ C ₂ T _x）MXene薄片的胶体，可为随机激射提供反馈。另外，与先前报道的散射体的光学特性为静态的随机激光系统相反，Ti ₃ C ₂ T _x的相对介电常数由于可吸收的特性，MXene薄片在光泵浦下可以变化。数值模拟表明，观察到的Ti ₃ C ₂ T _x MXene薄片的非线性响应可实现动态可调的随机激射。因此，泵送Ti ₃ C ₂ T _x带有第二光源的MXene薄片降低了获得随机激光所需的增益阈值。而且，使用数值模拟表明，对第二泵浦的强度的控制使得能够调整随机激光模式的场分布。考虑到MXenes系列的多样性，拟议的MXene胶体超材料设计为光子应用的激光特性的高级控制开辟了一条新途径。