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 (Ti3C2Tx) 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 Ti3C2Tx MXene flakes can be varied under optical pumping due to the saturable absorption properties. Numerical simulations indicate that the observed nonlinear response of Ti3C2Tx MXene flakes enables dynamically tunable random lasing. Thus, pumping the Ti3C2Tx 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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使用胶体碳化钛 MXene 动态控制随机激光

通过可剪裁和动态可调谐材料和可重构组合物控制激光特性可以增强随机激光器的性能，适用于广泛的应用。在这里，实验显示嵌入罗丹明 101 增益介质中的随机分散的弱散射单层碳化钛 (Ti3C2Tx) MXene 薄片胶体为随机激光提供反馈。此外，与之前报道的散射体的光学特性是静态的随机激光系统相比，由于可饱和的吸收特性，Ti3C2Tx MXene 薄片的相对介电常数可以在光泵浦下发生变化。数值模拟表明，观察到的 Ti3C2Tx MXene 薄片的非线性响应能够实现动态可调的随机激光。因此，用第二个光源泵浦 Ti3C2Tx MXene 薄片降低了获得随机激光所需的增益阈值。此外，使用数值模拟表明，对第二个泵的强度的控制能够调整随机激光模式的场分布。考虑到 MXenes 家族的多样性，提议的 MXene 胶体超材料设计开辟了一条新的途径来高级控制光子应用的激光特性。