Laser terahertz (THz) emission spectroscopy has broken the diffraction limit of THz frequencies and offers multifaceted spectroscopic and imaging capabilities for understanding the light–matter interaction in various quantum and energy materials. However, this advanced technique has not yet been applied in the recently extensively studied spintronic THz emission process, in which the material surface morphology may play an important role. Here, we conduct THz emission microscopy on 5.4-nm thick Pt/CoFeB/W heterostructures and obtain twice enhanced THz by tightly focusing the pumping laser, delicately choosing the radiation location on nanofilms and coating gold nanorods. Through THz emission mapping, the material surface morphology and its modification have a strong correlation with THz emission performance from spintronic emitters. Our proposed femtosecond fiber laser driven spintronic THz emission microscopy can provide exciting possibilities for studying surface morphology sensitive THz emission materials and microdomain ultrafast dynamics for low-dimensional small samples via further coupling optical microscopy.
Skip Nav Destination
Article navigation
16 May 2022
Research Article|
May 16 2022
Laser terahertz emission microscopy of nanostructured spintronic emitters
Special Collection:
Ultrafast and Terahertz Spintronics
Peiyan Li;
Peiyan Li
1
School of Electronic and Information Engineering, Beihang University
, Beijing 100191, China
Search for other works by this author on:
Shaojie Liu;
Shaojie Liu
2
School of Cyber Science and Technology, Beihang University
, Beijing 100191, China
Search for other works by this author on:
Zheng Liu;
Zheng Liu
3
Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology
, Shanghai 200093, China
Search for other works by this author on:
Min Li
;
Min Li
3
Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology
, Shanghai 200093, China
Search for other works by this author on:
Hao Xu;
Hao Xu
4
National Institute of Metrology
, Beijing 100029, China
Search for other works by this author on:
Yong Xu;
Yong Xu
5
Beijing Advanced Innovation Center for Big Data and Brain Computing, School of Microelectronics, Beihang University
, Beijing 100191, China
6
Hefei Innovation Research Institute, Beihang University
, Hefei 230012, China
Search for other works by this author on:
Heping Zeng;
Heping Zeng
a)
3
Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology
, Shanghai 200093, China
7
State Key Laboratory of Precision Spectroscopy, East China Normal University
, Shanghai 200062, China
8
Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University
, Chongqing 401120, China
a)Authors to whom correspondence should be addressed: hpzeng@phy.ecnu.edu.cn and xiaojunwu@buaa.edu.cn
Search for other works by this author on:
Xiaojun Wu
Xiaojun Wu
a)
1
School of Electronic and Information Engineering, Beihang University
, Beijing 100191, China
2
School of Cyber Science and Technology, Beihang University
, Beijing 100191, China
a)Authors to whom correspondence should be addressed: hpzeng@phy.ecnu.edu.cn and xiaojunwu@buaa.edu.cn
Search for other works by this author on:
a)Authors to whom correspondence should be addressed: hpzeng@phy.ecnu.edu.cn and xiaojunwu@buaa.edu.cn
Note: This paper is part of the APL Special Collection on Ultrafast and Terahertz Spintronics.
Appl. Phys. Lett. 120, 201102 (2022)
Article history
Received:
November 30 2021
Accepted:
May 05 2022
Citation
Peiyan Li, Shaojie Liu, Zheng Liu, Min Li, Hao Xu, Yong Xu, Heping Zeng, Xiaojun Wu; Laser terahertz emission microscopy of nanostructured spintronic emitters. Appl. Phys. Lett. 16 May 2022; 120 (20): 201102. https://doi.org/10.1063/5.0080397
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00