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

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Gückstock,  Oliver
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin;

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Rouzegar,  Seyed Mohammedreza
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin;

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Seifert,  Tom
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin;

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Kampfrath,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin;

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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0004-41EF-6
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.