Spintronic Frequency Conversion of Terahertz and Extreme-Ultraviolet Light Pulses

Le résumé fourni par la source

Finding efficient ways to generate and manipulate spin currents on ultrafast time scales is one of the hot topics in spintronics. Near-infrared (NIR) femtosecond pulses have demonstrated their perfect performance in this regard when interacting with ferromagnet/heavy metal heterostructures. The generated spin-transfer current can be converted into a charge current in a non-magnetic heavy metal layer emitting terahertz (THz) waves. Here we present our results showing that similar processes can also be observed using electromagnetic pulses of spectral ranges far beyond previous reports. The results show that THz pulses irradiating the heterostructure can not only be efficiently down-converted by an optical rectification mechanism (OR), as in case of NIR, but also up-converted, resulting in THz second harmonic generation (SHG) [1]. In the case of extreme-ultraviolet (XUV) pumping, we show that the XUV pulse parameters are encoded in the parameters of the emitted THz pulse, allowing a robust single-shot monitoring technique for the arrival time, energy, and duration of the XUV pulse [2].

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.