Spintronic terahertz metasurface emission characterized by scanning near-field nanoscopy-Reference-Cited by-同舟云学术

Spintronic terahertz metasurface emission characterized by scanning near-field nanoscopy

Published:2024-03-13 Issue:8 Volume:13 Page:1493-1502
ISSN:2192-8614
Container-title:Nanophotonics
language:en
Short-container-title:

Author:

Dai Mingcong¹^ORCID,Cai Jiahua¹^ORCID,Ren Zejun¹,Zhang Mingxuan¹,Wang Jiaqi¹,Xiong Hongting¹,Ma Yihang¹,Wang Youwei¹,Zhou Sitong¹,Li Kuiju¹,Lv Zhentao¹,Wu Xiaojun²³⁴^ORCID

Affiliation:

1. School of Electronic and Information Engineering , 12633 Beihang University , Beijing , China

2. School of Electronic and Information Engineering, and School of Cyber Science and Technology , 12633 Beihang University , Beijing , China

3. Zhangjiang Laboratory , 100 Haike Road , Shanghai , China

4. Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , China

Abstract

Abstract 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.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Open Project Program of Wuhan National Laboratory for Optoelectronics

Publisher

Walter de Gruyter GmbH

Link

https://www.degruyter.com/document/doi/10.1515/nanoph-2023-0858/pdf

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