Huang Chen, Chen Fei, Zhang Ze, Tang Xin, Zhu Meng, Sun Junjie, Chen Yi, Zhang Xin, Yu Jinghua, Zhang Yiwen
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100039, China.
Sensors (Basel). 2024 Jun 29;24(13):4226. doi: 10.3390/s24134226.
Pulsed lasers alter the optical properties of semiconductors and affect the photoelectric function of the photodetectors significantly, resulting in transient changes known as bleaching. Bleaching has a profound impact on the control and interference of photodetector applications. Experiments using pump-probe techniques have made significant contributions to understanding ultrafast carrier dynamics. However, there are few theoretical studies to the best of our knowledge. Here, carrier dynamic models for semiconductors and photodetectors are established, respectively, employing the rectified carrier drift-diffusion model. The pulsed laser bleaching effect on seven types of semiconductors and photodetectors from visible to long-wave infrared is demonstrated. Additionally, a continuous bleaching method is provided, and the finite-difference time-domain (FDTD) method is used to solve carrier dynamic theory models. Laser parameters for continuous bleaching of semiconductors and photodetectors are calculated. The proposed bleaching model and achieved laser parameters for continuous bleaching are essential for several applications using semiconductor devices, such as infrared detection, biological imaging, and sensing.
脉冲激光会改变半导体的光学特性，并显著影响光电探测器的光电功能，从而导致被称为漂白的瞬态变化。漂白对光电探测器应用的控制和干扰有着深远的影响。使用泵浦-探测技术的实验对理解超快载流子动力学做出了重大贡献。然而，据我们所知，理论研究很少。在此，分别采用修正的载流子漂移-扩散模型建立了半导体和光电探测器的载流子动力学模型。展示了脉冲激光对从可见光到长波红外的七种半导体和光电探测器的漂白效应。此外，提供了一种连续漂白方法，并使用时域有限差分（FDTD）方法求解载流子动力学理论模型。计算了半导体和光电探测器连续漂白的激光参数。所提出的漂白模型和实现的连续漂白激光参数对于使用半导体器件的多种应用至关重要，例如红外探测、生物成像和传感。
