Modification of terahertz emission spectrum using microfabricated spintronic emitters
Abstract
Terahertz (THz) radiation with sub-millimeter wavelength falls in the gap between optical and radio frequencies. Conventional THz emitters do not intertwine with spin degrees of freedom. However, it was recently shown that broadband THz radiation can be efficiently created also by exploiting spin-based effects on ultrafast time scales. Here, we demonstrate the generation and control of THz radiation from microstructured spintronic THz emitters based on the inverse spin-Hall effect. Using time-domain THz spectroscopy, we compare the THz spectra of different stripe patterns made of Fe/Pt bilayers with a spectrum obtained from an extended Fe/Pt bilayer film. It is found that the THz spectrum can be altered by a proper choice of the microstructure dimensions. The experimentally observed spectra are interpreted in terms of a simplified multi-slit interference model, which captures the main experimental features. Our results pave the way for an efficient control of THz light emitted from magnetic heterostructures. This is a crucial step forward for the design and realization of directional THz sources.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1658644
- Grant/Contract Number:
- AC02-06CH11357; SC0012509
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Name: Journal of Applied Physics Journal Volume: 128 Journal Issue: 10; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Wu, Weipeng, Lendinez, Sergi, Taghipour Kaffash, Mojtaba, Schaller, Richard D., Wen, Haidan, and Jungfleisch, M. Benjamin. Modification of terahertz emission spectrum using microfabricated spintronic emitters. United States: N. p., 2020.
Web. doi:10.1063/5.0013676.
Wu, Weipeng, Lendinez, Sergi, Taghipour Kaffash, Mojtaba, Schaller, Richard D., Wen, Haidan, & Jungfleisch, M. Benjamin. Modification of terahertz emission spectrum using microfabricated spintronic emitters. United States. https://doi.org/10.1063/5.0013676
Wu, Weipeng, Lendinez, Sergi, Taghipour Kaffash, Mojtaba, Schaller, Richard D., Wen, Haidan, and Jungfleisch, M. Benjamin. Tue .
"Modification of terahertz emission spectrum using microfabricated spintronic emitters". United States. https://doi.org/10.1063/5.0013676.
@article{osti_1658644,
title = {Modification of terahertz emission spectrum using microfabricated spintronic emitters},
author = {Wu, Weipeng and Lendinez, Sergi and Taghipour Kaffash, Mojtaba and Schaller, Richard D. and Wen, Haidan and Jungfleisch, M. Benjamin},
abstractNote = {Terahertz (THz) radiation with sub-millimeter wavelength falls in the gap between optical and radio frequencies. Conventional THz emitters do not intertwine with spin degrees of freedom. However, it was recently shown that broadband THz radiation can be efficiently created also by exploiting spin-based effects on ultrafast time scales. Here, we demonstrate the generation and control of THz radiation from microstructured spintronic THz emitters based on the inverse spin-Hall effect. Using time-domain THz spectroscopy, we compare the THz spectra of different stripe patterns made of Fe/Pt bilayers with a spectrum obtained from an extended Fe/Pt bilayer film. It is found that the THz spectrum can be altered by a proper choice of the microstructure dimensions. The experimentally observed spectra are interpreted in terms of a simplified multi-slit interference model, which captures the main experimental features. Our results pave the way for an efficient control of THz light emitted from magnetic heterostructures. This is a crucial step forward for the design and realization of directional THz sources.},
doi = {10.1063/5.0013676},
journal = {Journal of Applied Physics},
number = 10,
volume = 128,
place = {United States},
year = {Tue Sep 08 00:00:00 EDT 2020},
month = {Tue Sep 08 00:00:00 EDT 2020}
}
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