Antenna-coupled spintronic terahertz emitters driven by a 1550 nm femtosecond laser oscillator
| Autor: | U. Nandi, Samridh Jaiswal, Tom Seifert, Seyed Mohammedreza Rouzegar, Oliver Gueckstock, Tobias Kampfrath, M. S. Abdelaziz, Gerhard Jakob, Sascha Preu, Mathias Kläui |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Terahertz radiation 02 engineering and technology 01 natural sciences law.invention law antenna-coupled spintronic terahertz emitters laser oscillator 0103 physical sciences Laser power scaling 010302 applied physics Spintronics business.industry Dynamic range Photoconductivity Bandwidth (signal processing) 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik 021001 nanoscience & nanotechnology Laser Femtosecond Optoelectronics terahertz emitters 0210 nano-technology business |
| Zdroj: | Applied Physics Letters |
| Popis: | 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.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. |
| Databáze: | OpenAIRE |
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