科学研究

国际太赫兹科教协同平台面向世界科学前沿和国家重大需求，针对太赫兹领域缺乏高效率辐射源、核心器件和系统集成技术等国际公认科学难题与技术挑战，开展高功率强场太赫兹光源理论与技术、新材料与新结构太赫兹器件、太赫兹纳米和近场光学、太赫兹系统集成技术及应用等研究，以项目为载体，用高水平科学研究结合高层次国际学术交流，培养高质量太赫兹卓越人才，推动高协同转移转化，打造国际太赫兹科学研究圣地、人才培养基地、成果转化高低。

北航国际太赫兹团队的研究领域为强场太赫兹光学，主要面向强场太赫兹电磁脉冲在电子加速、物态调控、生物医疗、无损检测等方面的应用需求，聚焦超短超强飞秒激光泵浦铌酸锂等固体材料，开展高性能太赫兹强场光源及其应用研究。在铌酸锂太赫兹强源、新材料和新结构太赫兹器件、强场太赫兹应用系统等方面取得了一些原创成果。

研究成果总结

（1）揭示了超短超强飞秒激光泵浦大尺寸铌酸锂晶体，通过倾斜波前技术产生太赫兹辐射效率低的瓶颈问题，提出了克服太赫兹效率饱和的协同补偿效率线性化新机制，率先在国际上连续突破了1.4mJ和13.9mJ铌酸锂太赫兹强源（国际最高值为0.4mJ），将太赫兹单脉冲能量提升了两个数量级。

13.9mJ铌酸锂THz强源光路及输出能量和效率曲线

（2）开展了二维磁性材料与拓扑绝缘体异质结产生太赫兹辐射的研究，实现了超快太赫兹自旋流的室温产生和探测；提出了基于反铁磁-铁磁异质结交换偏置效应的无外磁驱动自旋太赫兹辐射新方法，克服了大口径自旋太赫兹辐射由于外部磁化不均匀引起的光束质量差的难题，获得了无外磁驱动的四英寸自旋太赫兹强场发射器。

二维磁性材料与拓扑绝缘体异质结的太赫兹产生与探测

无外磁场驱动的4英寸铁磁-反铁磁强场太赫兹发射器

（3）研制了强场太赫兹光源泵浦的多光谱探测实验系统，率先提出了将强场太赫兹脉冲耦合进入纳米超表面缝隙中，实现了上千倍的近场局域场增强的新范式，为发展更先进的强场太赫兹物态调控与表征奠定了实验基础。

自主研制的铌酸锂太赫兹强源泵浦-多光谱探测集成系统

部分代表性文章：

[1] Xiaojun Wu*, Deyin Kong#, Sibo Hao#, Yushan Zeng#, Xieqiu Yu, Baolong Zhang, Mingcong Dai, Shaojie Liu, Jiaqi Wang, Zejun Ren, Sai Chen, Jianhua Sang, Kang Wang, Dongdong Zhang, Zhongkai Liu, Jiayan Gui, Xiaojun Yang, Yi Xu, Yuxin Leng, Yutong Li, Liwei Song*, Ye Tian*, and Ruxin Li, Generation of 13.9-mJ Terahertz Radiation from Lithium Niobate Materials, Advanced Materials 35, 2208947 (2023) (https://doi-org-s.vpn.buaa.edu.cn:8118/10.1002/adma.202208947)

[2] Xiaojun Wu*, Hanchen Wang#, Haijiang Liu#, Yizhan Wang#, Xinhou Chen, Peng Chen, Peiyan Li, Xiufeng Han, Jungang Miao, Haiming Yu, Caihua Wan,* Jimin Zhao*, and Sai Chen*, Antiferromagnetic–Ferromagnetic Heterostructure-Based Field-Free Terahertz Emitters, Advanced Materials 34, 2204373 (2022) (https://doi.org/10.1002/adma.202204373)

[3] Xieqiu Yu#, Yushan Zeng#, Liwei Song*, Deyin Kong, Sibo Hao, Jiayan Gui, Xiaojun Yang, Yixu, Xiaojun Wu*, Yuxin Leng, Yetian*, and Ruxin Li*, Megaelectronvolt electron acceleration driven by terahertz surface waves, Nature Photonics 17, 957 (2023) (https://doi.org/10.1038/s41566-023-01251-8)

[4] Baolong Zhang; Zhenzhe Ma; Jinglong Ma; Xiaojun Wu; Chen Ouyang; Deyin Kong; Tianshu Hong; Xuan Wang; Peidi Yang; Liming Chen; Yutong Li; Jie Zhang ; 1.4-mJ High Energy Terahertz Radiation from Lithium Niobates, Laser & Photonics Reviews 15, 2000295 (2021) (https://onlinelibrary.wiley.com/doi/10.1002/lpor.202000295)

[5] Xinhou Chen#, Hangtian Wang#, Haijiang Liu#, Chun Wang, Gaoshuai Wei, ChanFang, Hanchen Wang, Chunyan Geng, Shaojie Liu, Peiyan Li, Haiming Yu, Weisheng Zhao, Jungang Miao, Yutong Li, Li Wang, Tianxiao Nie*, JiminZhao*, and Xiaojun Wu*, Generation and Control of Terahertz Spin Currents in Topology-Induced 2D Ferromagnetic Fe3GeTe2|Bi2Te3 Heterostructures, Advanced Materials 34, 2106172 (2022) （https://doi.org/10.1002/adma.202106172）

[6] Baolong zhang; Yifei Li; Xiaojun Wu*; Xitan Xu; Yao Lu; Qiang Wu; Xuan Wang; Hongyi Lei; Jinglong Ma; Guoqian Liao; Yutong Li*, Enhanced terahertz phonon polariton in lithium niobate chip, Laser & Photonics Reviews 2300895 (2023) (https://doi.org/10.1002/lpor.202300895)

[7] Shixing Yuan, Liao Chen, Ziwei Wang, Wentao Deng, Zhibo Hou, Chi Zhang, Yu Yu, Xiaojun Wu,* and Xinliang Zhang,* On-chip terahertz isolator with ultrahigh isolation ratios, Nature Communications 12, 5570 (2021)

( https://doi.org/10.1038/s41467-021-25881-0)

[8] Jiahua Cai, Mingcong Dai, Sai Chen, Peng Chen, Jiaqi Wang, Hongting Xiong, Zejun Ren, Shaojie Liu, Zhongkai Liu, Caihua Wan, Ming Bai, and Xiaojun Wu*, Terahertz spin currents resolved with nanometer spatial resolution, Applied Physics Reviews 10, 041414 (2023) (https://doi.org/10.1063/5.0170207)

[9] Tian Dong, Shaoxian Li, Manukumara Manjappa, Peidi Yang, Jiangping Zhou, Deyin Kong, Baogang Quan, Xieyu Chen, Chen Ouyang, Fei Dai, Jiaguang Han, Chunmei Ouyang, Xueqian Zhang, Junjie Li, Yang Li, Jungang Miao, Yutong Li, Li Wang, Ranjan Singh,* Weili Zhang,* and Xiaojun Wu* Nonlinear THz-Nano Metasurfaces, Advanced Functional Materials 31, 2100463 (2021) (https://onlinelibrary.wiley.com/doi/10.1002/adfm.202100463)

[10] Haihui Zhao#, Xinhou Chen#, Chen Ouyang, Hangtian Wang, Deyin Kong, Peidi Yang, Baolong Zhang,Chun Wang, Gaoshuai Wei, Tianxiao Nie,* Weisheng Zhao,* Jungang Miao, Yutong Li, Li Wang,* and Xiaojun Wu,* Generation and manipulation of chiral terahertz waves in the three-dimensional topological insulator Bi2Te3, Advanced Photonics 2, 066003 (2020) (DOI:10.1117/1.ap.2.6.066003)