Xu Yanming, Xu Haojie, Zhu Pengfei, Xu Jinlong, Huang Yantang, Sun Zhihua, Li Fushan, Zhu Shining, Zhou Lin
College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108, China.
National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.
Sci Adv. 2025 May 23;11(21):eadt9952. doi: 10.1126/sciadv.adt9952.
Broadband photodetection, especially for the high-intensity pulsed lasers, has garnered increasing interest in photophysics and applied sciences driven by the development of pulsed lasers. However, direct broadband photodetection of high-intensity pulsed lasers, with precisely capturing their spatiotemporal properties, has been hampered by low saturation intensity or damage threshold of traditional optoelectronic materials. Here, we demonstrate that strategic enhancement of excitonic effects in two-dimensional (2D) layered hybrid perovskite can enable robust high-order multiphoton absorption (MPA) optoelectronics with achieving strong four-photon absorption (4PA) and five-photon absorption (5PA) nonlinearities as well as efficient electronic properties simultaneously. This effectively overcomes the limitations of mainstream photodetectors. Our approach facilitates direct photodetection and high-precision imaging of high-intensity femtosecond lasers (21.5 GW/cm) across a broad wavelength range of 800 to 2300 nanometer. These results offer valuable insights into advancing high-order nonlinearity-based optoelectronics and provide practical solutions for direct measurement tools of intensive lasers, filling the blank of high-precision characterization of intense-field laser phenomena.
宽带光探测，特别是对于高强度脉冲激光器而言，在脉冲激光器发展的推动下，已在光物理和应用科学领域引起了越来越多的关注。然而，传统光电子材料的低饱和强度或损伤阈值阻碍了对高强度脉冲激光器进行直接宽带光探测并精确捕获其时空特性。在此，我们证明，在二维（2D）层状杂化钙钛矿中策略性地增强激子效应，可以实现强大的高阶多光子吸收（MPA）光电子学，同时实现强四光子吸收（4PA）和五光子吸收（5PA）非线性以及高效的电子特性。这有效地克服了主流光电探测器的局限性。我们的方法有助于在800至2300纳米的宽波长范围内对高强度飞秒激光器（21.5 GW/cm）进行直接光探测和高精度成像。这些结果为推进基于高阶非线性的光电子学提供了有价值的见解，并为强激光的直接测量工具提供了实际解决方案，填补了强场激光现象高精度表征的空白。
