Journal
APPLIED PHYSICS LETTERS
Volume 115, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5089421
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [290319996/TRR173, 318612841, 278381540/PR1413/3-1, SFB/TRR227]
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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 mu m 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 mu m 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. Published under license by AIP Publishing.
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