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  Antenna-coupled spintronic terahertz emitters driven by a 1550 nm femtosecond laser oscillator

Nandi, U., Abdelaziz, M. S., Jaiswal, S., Jakob, G., Gückstock, O., Rouzegar, S. M., et al. (2019). Antenna-coupled spintronic terahertz emitters driven by a 1550 nm femtosecond laser oscillator. Applied Physics Letters, 115(02): 022405. doi:10.1063/1.5089421.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0004-41EF-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000D-3709-C
Genre: Journal Article

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 Creators:
Nandi, U.1, Author
Abdelaziz, M. S.1, Author
Jaiswal, S.2, Author
Jakob, G.2, Author
Gückstock, Oliver3, 4, Author           
Rouzegar, Seyed Mohammedreza3, 4, Author           
Seifert, Tom3, 4, Author           
Kläui, M.2, Author
Kampfrath, Tobias3, 4, Author           
Preu, S.1, Author
Affiliations:
1Department of Electrical Engineering and Information Technology, TU Darmstadt, 64283 Darmstadt, Germany, ou_persistent22              
2Institute of Physics, Johannes Gutenberg University, Mainz, 55099 Mainz, Germany, ou_persistent22              
3Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
4Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany, ou_persistent22              

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 Abstract: We demonstrate antenna-coupled spintronic terahertz (THz) emitters excited by 1550 nm, 90 fs laser pulses. Antennas are employed to optimize THz outcoupling and frequency coverage of ferromagnetic/nonmagnetic metallic spintronic structures. We directly compare the antenna-coupled devices to those without antennas. Using a 200 μm H-dipole antenna and an ErAs:InGaAs photoconductive receiver, we obtain a 2.42-fold larger THz peak-peak signal, a bandwidth of 4.5 THz, and an increase in the peak dynamic range (DNR) from 53 dB to 65 dB. A 25 μm slotline antenna offered 5 dB larger peak DNR and a bandwidth of 5 THz. For all measurements, we use a comparatively low laser power of 45 mW from a commercial fiber-coupled system that is frequently employed in table-top THz time-domain systems.

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Language(s): eng - English
 Dates: 2019-062019-07-092019-07
 Publication Status: Issued
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.5089421
 Degree: -

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Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: 5 Volume / Issue: 115 (02) Sequence Number: 022405 Start / End Page: - Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223