The FET OPEN project s-NEBULA (a FR-DE-SE-CZ partnership led by THALES) explores a novel approach to THz generation exploiting ultrafast spin-orbit interaction (SO) at the interface of magnetic/non-magnetic metallic thin films.
The advantage of such a spintronic emitter is multifold. Besides being compact and operated at room-temperature (RT), as it exploits the ultrafast electron relaxation times in metals and is not hindered by phonon absorption, it can be ultrabroadband and potentially polarization tunable by controlling magnetization in the ferromagnetic layer. Presently, there isn’t a single solid-state THz emitter that is capable of delivering such a performance. Up till now only pulsed THz spintronic emitters have been demonstrated.
This PhD project will explore the possibility of obtaining a tunable spintronic RT continuous-wave (CW) emission of THz radiation by photomixing two intense laser lines on a FM/NM multilayer.
The PhD candidate will be involved in demonstrating the possibility of creating continuous-wave THz emission using spintronic effects. Such a demonstration would be a world first. In a second step it will be explored how the polarization of the CW signal can be rapidly modulated by reorienting the magnetization direction in the ferromagnetic layers using rapid magnetoelastic effects (coupling magnetization to strain or acoustic waves).
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