TY - JOUR
T1 - Modification of terahertz emission spectrum using microfabricated spintronic emitters
AU - Wu, Weipeng
AU - Lendinez, Sergi
AU - Taghipour Kaffash, Mojtaba
AU - Schaller, Richard D.
AU - Wen, Haidan
AU - Jungfleisch, M. Benjamin
N1 - Funding Information:
This work was supported by the National Science Foundation (NSF) under Grant No. 1833000 and the University of Delaware Research Foundation (UDRF). Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. H.W. also acknowledges support from the Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-SC0012509.
Publisher Copyright:
© 2020 Author(s).
PY - 2020/9/14
Y1 - 2020/9/14
N2 - 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.
AB - 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.
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U2 - 10.1063/5.0013676
DO - 10.1063/5.0013676
M3 - Article
AN - SCOPUS:85092292426
VL - 128
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 10
M1 - 103902-1
ER -