Chen Xiaoqing, Zhang Yu, Tian Ruijuan, Wu Xianghu, Luo Zhengdong, Liu Yan, Wang Xinran, Zhao Jianlin, Gan Xuetao
Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an710129, China.
Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi'an710071, China.
Nano Lett. 2023 Feb 8;23(3):1023-1029. doi: 10.1021/acs.nanolett.2c04472. Epub 2023 Jan 27.
With unique electronic and optical attributes and dangling-bond-free surface, two-dimensional (2D) materials have broadened the functionalities of photodetectors. Here, we report a quadratically nonlinear photodetector (QNPD) composed of a van der Waals (vdW) stacked GaSe/InSe heterostructure. Compared with the reported 2D material-based photodetectors, the extra second-harmonic generation (SHG) process in GaSe/InSe leads to the quadratically nonlinear function between photocurrent and optical intensity, extending the photodetection wavelength from 900 to 1750 nm. The QNPD is highly sensitive to the variation of optical intensity with improved spatial resolution. With the light-light interaction in SHG converted into electrical signal directly, we also demonstrate the QNPD as an autocorrelator for measuring ultrafast pulse widths and an optoelectronic mixer of two modulated pulses for signal processings. The simultaneous involvement of light-light interaction and photoelectric conversion in the vdW stacked QNPD promises its potential to simplify the optoelectronic systems.
二维（2D）材料具有独特的电子和光学特性以及无悬键表面，拓宽了光电探测器的功能。在此，我们报道了一种由范德华（vdW）堆叠的GaSe/InSe异质结构组成的二次非线性光电探测器（QNPD）。与已报道的基于二维材料的光电探测器相比，GaSe/InSe中额外的二次谐波产生（SHG）过程导致光电流与光强之间呈现二次非线性函数关系，将光探测波长从900 nm扩展到1750 nm。该QNPD对光强变化高度敏感，且空间分辨率有所提高。通过将SHG中的光 - 光相互作用直接转换为电信号，我们还展示了该QNPD可作为用于测量超快脉冲宽度的自相关器以及用于信号处理的两个调制脉冲的光电混频器。vdW堆叠的QNPD中光 - 光相互作用和光电转换的同时参与，有望简化光电子系统。
