Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters

Shunjia Wang; Wentao Qin; Tongyang Guan; Jingyu Liu; Qingnan Cai; Sheng Zhang; Lei Zhou; Yan Zhang; Yizheng Wu; Zhensheng Tao

doi:10.1186/s43593-024-00069-3

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Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters

光：快讯（英文） 2024年4卷

RESEARCH ARTICLE | Updated：2024-09-25

- Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters
- Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters
- Affiliations：
  
  State Key Laboratory of Surface Physics and Department of Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE), Fudan University, Shanghai 200433, China
  Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Advanced Innovation Center for Imaging Theory and Technology, Department of Physics, Capital Normal University, Beijing 100048, China
  Shanghai Key Laboratory of Metasurfaces for Light Manipulation, Shanghai 200433, China
- Author bio：
  
  *Yan Zhangyzhang@cnu.edu.cn
  Yizheng Wuwuyizheng@fudan.edu.cn
  Zhensheng Taozhenshengtao@fudan.edu.cn
- Funds：
  
  National Key Research and Development Program of China(2022YFA1404700);National Key Research and Development Program of China(2021YFA1400200);National Natural Science Foundation of China(12274091);National Natural Science Foundation of China(12221004);Shanghai Municipal Science and Technology Basic Research Project(22JC1400200);National Natural Science Foundation of China(121774271);National Natural Science Foundation of China(62192771);National Key Research Program of China(2022YFA1403300);National Natural Science Foundation of China(11974079;12274083);Shanghai Municipal Science and Technology Major Project(2019SHZDZX01);Shanghai Municipal Science and Technology(23dz2260100)
- DOI：10.1186/s43593-024-00069-3
  中图分类号：
- 收稿日期：2024-01-12，
  
  修回日期：2024-04-02，
  
  录用日期：2024-05-31，
  
  网络出版日期：2024-07-08，
  
  纸质出版日期：2024-12
- Accepted：
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Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters[J]. 光：快讯（英文）, 2024,4.

Shunjia Wang, Wentao Qin, Tongyang Guan, et al. Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters[J]. Elight, 2024, 4.
Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters[J]. 光：快讯（英文）, 2024,4. DOI： 10.1186/s43593-024-00069-3.

Shunjia Wang, Wentao Qin, Tongyang Guan, et al. Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters[J]. Elight, 2024, 4. DOI： 10.1186/s43593-024-00069-3.

摘要

Abstract

Structured light

particularly in the terahertz frequency range

holds considerable potential for a diverse range of applications. However

the generation and control of structured terahertz radiation pose major challenges. In this work

we demonstrate a novel programmable spintronic emitter that can flexibly generate a variety of structured terahertz waves. This is achieved through the precise and high-resolution programming of the magnetization pattern on the emitter’s surface

utilizing laser-assisted local field cooling of an exchange-biased ferromagnetic heterostructure. Moreover

we outline a generic design strategy for realizing specific complex structured terahertz fields in the far field. Our device successfully demonstrates the generation of terahertz waves with diverse structured polarization states

including spatially separated circular polarizations

azimuthal or radial polarization states

and a full Poincaré beam. This innovation opens a new avenue for designing and generating structured terahertz radiations

with potential applications in terahertz microscopy

communication

quantum information

and light-matter interactions.

关键词

Keywords

references

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