Spintronic terahertz metasurface emission characterized by scanning near-field nanoscopy

Dai Mingcong; Cai Jiahua; Ren Zejun; Zhang Mingxuan; Wang Jiaqi; Xiong Hongting; Ma Yihang; Wang Youwei; Zhou Sitong; Li Kuiju; Lv Zhentao; Wu Xiaojun

doi:10.1515/nanoph-2023-0858

Nanophotonics (Mar 2024)

Spintronic terahertz metasurface emission characterized by scanning near-field nanoscopy

Dai Mingcong,
Cai Jiahua,
Ren Zejun,
Zhang Mingxuan,
Wang Jiaqi,
Xiong Hongting,
Ma Yihang,
Wang Youwei,
Zhou Sitong,
Li Kuiju,
Lv Zhentao,
Wu Xiaojun

Affiliations

Dai Mingcong: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Cai Jiahua: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Ren Zejun: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Zhang Mingxuan: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Wang Jiaqi: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Xiong Hongting: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Ma Yihang: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Wang Youwei: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Zhou Sitong: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Li Kuiju: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Lv Zhentao: School of Electronic and Information Engineering, 12633Beihang University, Beijing, China
Wu Xiaojun: School of Electronic and Information Engineering, and School of Cyber Science and Technology, 12633Beihang University, Beijing, China

DOI: https://doi.org/10.1515/nanoph-2023-0858
Journal volume & issue: Vol. 13, no. 8
pp. 1493 – 1502

Abstract

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Understanding the ultrafast excitation, detection, transportation, and manipulation of nanoscale spin dynamics in the terahertz (THz) frequency range is critical to developing spintronic THz optoelectronic nanodevices. However, the diffraction limitation of the sub-millimeter waves – THz wavelengths – has impaired experimental investigation of spintronic THz nano-emission. Here, we present an approach to studying laser THz emission nanoscopy from W|CoFeB|Pt metasurfaces with ∼60-nm lateral spatial resolution. When comparing with statistic near-field THz time-domain spectroscopy with and without the heterostructures on fused silica substrates, we find that polarization- and phase-sensitive THz emission nanoscopy is more sensitive than the statistic THz scattering intensity nanoscopy. Our approach opens explorations of nanoscale ultrafast THz spintronic dynamics in optically excited metasurfaces.

Published in Nanophotonics

ISSN: 2192-8606 (Print); 2192-8614 (Online)
Publisher: De Gruyter
Country of publisher: Germany
LCC subjects: Science: Physics
Website: https://www.degruyter.com/journal/key/nanoph/html#submit

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