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Proceedings Paper

Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths
Author(s): René Beigang; Evangelos Th. Papaioannou; Laura Scheuer; Sascha Keller; Garik Torosyan; Marco Rahm; Dominik Sokoluk; Miezel Talara; Yoshinori Oda; Hideaki Kitahara; Jessica Afalla; Valynn Katrine Mag-usara; Masahiko Tani
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Paper Abstract

Recent studies in spintronics have highlighted ultrathin magnetic metallic multilayers as a novel and very promising class of broadband terahertz radiation sources. Such spintronic multilayers consist of ferromagnetic (FM) and non-magnetic (NM) thin films. When triggered by ultrafast laser pulses, they generate pulsed THz radiation due to the inverse spin-Hall effect – a mechanism that converts optically driven spin currents from the magnetized FM layer into transient transverse charge currents in the NM layer, resulting in THz emission. As THz emitters, FM/NM multilayers have been intensively investigated so far only at 800-nm excitation wavelength using femtosecond Ti:sapphire lasers. In this work, we demonstrate that an optimized spintronic bilayer structure of 2-nm Fe and 3-nm Pt grown on 500 μm MgO substrate is just as effective as a THz radiation source when excited either at λ = 400 nm, λ = 800 nm or at λ = 1550 nm by ultrafast laser pulses (pulse width ~100 fs, repetition rate ~100 MHz). Even at low incident power levels, the Fe/Pt spintronic emitter exhibits efficient generation of THz radiation at all three excitation wavelengths. The efficient THz emitter operation at 1550 nm facilitates the integration of such spintronic emitters in THz systems driven by relatively low cost and compact fs fiber lasers without the need for frequency conversion.

Paper Details

Date Published: 1 March 2019
PDF: 7 pages
Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 109170O (1 March 2019); doi: 10.1117/12.2514564
Show Author Affiliations
René Beigang, Technische Univ. Kaiserslautern (Germany)
Evangelos Th. Papaioannou, Technische Univ. Kaiserslautern (Germany)
Laura Scheuer, Technische Univ. Kaiserslautern (Germany)
Sascha Keller, Technische Univ. Kaiserslautern (Germany)
Garik Torosyan, Photonik-Zentrum Kaiserslautern e.V. (Germany)
Marco Rahm, Technische Univ. Kaiserslautern (Germany)
Dominik Sokoluk, Technische Univ. Kaiserslautern (Germany)
Miezel Talara, Univ. of Fukui (Japan)
Yoshinori Oda, Univ. of Fukui (Japan)
Hideaki Kitahara, Univ. of Fukui (Japan)
Jessica Afalla, Univ. of Fukui (Japan)
Valynn Katrine Mag-usara, Univ. of Fukui (Japan)
Masahiko Tani, Univ. of Fukui (Japan)

Published in SPIE Proceedings Vol. 10917:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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