On-Chip Generation of Ultrafast Current Pulses by Nanolayered Spintronic Terahertz Emitters
journal contributionposted on 06.07.2021, 23:43 by Wolfgang Hoppe, Jonathan Weber, Saban Tirpanci, Oliver Gueckstock, Tobias Kampfrath, Georg Woltersdorf
We generate ultrafast current pulses by optical means with the aid of the inverse spin Hall effect. In ferromagnet/normal metal bilayer structures, intense spin current pulses are generated by optical pumping with intense femtosecond laser pulses. Subsequently, the spin current pulses are converted into a charge current pulse via the inverse spin Hall effect and launched into waveguide structures. The electrical signals are detected using a sampling oscilloscope. We propose to use these nanolayered emitters to act as on-chip THz sources and robust ultrafast photodetectors, which can be combined with metallic waveguide structures. In doing so, the on-chip control of THz fields becomes possible on the nanometer scale.