Chinese Optics Letters, 2024, 22 (1): 013202, Published Online: Jan. 19, 2024  

Efficient terahertz generation from van der Waals α-In2Se3

Author Affiliations
1 Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, China
2 Hunan Key Laboratory of Extreme Matter and Applications (XMAL), Changsha 410073, China
3 Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China
4 Guangxi Key Laboratory of Automatic Detecting Technology and Instrument, Guilin University of Electronic Technology, Guilin 541004, China
Abstract
Two-dimensional (2D) van der Waals materials have attracted tremendous attention due to their versatile physical properties and flexible manipulation approaches. Among the various types of van der Waals materials, α-In2Se3 is remarkable for its intrinsic 2D ferroelectricity and high-performance opto-electronic properties. However, the study of the α-In2Se3 system in terahertz (THz) radiation is scarce, although it is promising for electrically controlled THz field manipulation. We investigate the α-In2Se3 in different thicknesses and report that the THz generation efficiency induced by femtosecond laser pulses can be largely improved by reducing the thickness from the bulk. Furthermore, we reveal the surge current in thin film coupled with THz emission exhibits a different Auger recombination mode, which is helpful in understanding the mechanism and provides insights into the design of 2D highly efficient THz devices.

Shijie Duan, Ming Yang, Suyuan Zhou, Longhui Zhang, Jinsen Han, Xu Sun, Guang Wang, Changqin Liu, Dongdong Kang, Xiaowei Wang, Jiahao Chen, Jiayu Dai. Efficient terahertz generation from van der Waals α-In2Se3[J]. Chinese Optics Letters, 2024, 22(1): 013202.

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