Xu Yanming, Wang Fan, Xu Jinlong, Lv Xinjie, Zhao Gang, Sun Zhihua, Xie Zhenda, Zhu Shining
Opt Express. 2024 Jan 29;32(3):4334-4345. doi: 10.1364/OE.509180.
Integrated on-chip femtosecond (fs) laser optoelectronic system, with photodetector as a critical component for light-electrical signal conversion, is a long-sought-after goal for a wide range of frontier applications. However, the high laser peak intensity and complicated nanophotonic waveguide structure of on-chip fs laser are beyond the detectability and integrability of conventional photodetectors. Therefore, flexible photodetector with the response on intense fs laser is in urgent needs. Herein, we demonstrate the first (to our knowledge) two-photon absorption (TPA) flexible photodetector based on the strong TPA nonlinearity of layered hybrid perovskite (IA)(MA)PbBr, exhibiting efficient sub-bandgap response on the infrared fs laser at 700-1000 nm. High saturation intensity up to ∼3.8 MW/cm is achieved. The device also shows superior current stability even after bending for 1000 cycles. This work may pave the new way for the application of flexible optoelectronics specialized in integrated fs-laser detection.
集成片上飞秒（fs）激光光电系统，其中光电探测器作为光 - 电信号转换的关键组件，是众多前沿应用长期追求的目标。然而，片上飞秒激光的高激光峰值强度和复杂的纳米光子波导结构超出了传统光电探测器的可探测性和可集成性。因此，迫切需要对强飞秒激光有响应的柔性光电探测器。在此，我们展示了首个（据我们所知）基于层状混合钙钛矿（IA）（MA）PbBr的强双光子吸收（TPA）非线性的双光子吸收柔性光电探测器，其在700 - 1000 nm的红外飞秒激光上表现出高效的亚带隙响应。实现了高达约3.8 MW/cm的高饱和强度。该器件即使在弯曲1000次循环后仍显示出优异的电流稳定性。这项工作可能为专门用于集成飞秒激光检测的柔性光电子学应用开辟新途径。
