0000000000886835

AUTHOR

Sascha Preu

showing 2 related works from this author

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

2019

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 comme…

Materials sciencePhysics and Astronomy (miscellaneous)Terahertz radiation02 engineering and technology01 natural sciences530law.inventionlawantenna-coupled spintronic terahertz emitterslaser oscillator0103 physical sciencesLaser power scaling010302 applied physicsSpintronicsbusiness.industryDynamic rangePhotoconductivityBandwidth (signal processing)500 Naturwissenschaften und Mathematik::530 Physik::530 Physik021001 nanoscience & nanotechnologyLaserFemtosecondOptoelectronicsterahertz emitters0210 nano-technologybusiness
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Effect of DC Electric Field on the Emitted THz Signal of Antenna-Coupled Spintronic Emitters

2019

We study the impact of an external electric DC field on antenna-coupled spintronic THz emitters driven by a 90 fs, 1550 nm laser oscillator. Simultaneous application of external electric and magnetic field shows a quadratic decrease in peak-peak THz pulse with increase in the bias voltage. We ascribe this decrease to Joule heating caused by the DC current flowing through the spintronic material.

Materials scienceSpintronicsbusiness.industryTerahertz radiationBiasing02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesMagnetic fieldMagnetizationElectric field0103 physical sciencesOptoelectronicsAntenna (radio)010306 general physics0210 nano-technologyJoule heatingbusiness2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
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