Ultrabroadband single-cycle terahertz pulses with peak fields of 300 kV cm(-1) from a metallic spintronic emitter

作者：Seifert T; Jaiswal S; Sajadi M; Jakob G; Winnerl S; Wolf M; Klaeui M; Kampfrath T^*

来源：Applied Physics Letters, 2017, 110(25): 252402.

DOI：10.1063/1.4986755

We explore the capabilities of metallic spintronic thin-film stacks as a source of intense and broadband terahertz electromagnetic fields. For this purpose, we excite a W/CoFeB/Pt trilayer (thickness of 5.6 nm) on a large-area glass substrate (diameter of 7.5 cm) by a femtosecond laser pulse (energy 5.5 mJ, duration 40 fs, and wavelength 800 nm). After focusing, the emitted terahertz pulse is measured to have a duration of 230 fs, a peak field of 300 kV cm(-1), and an energy of 5 nJ. In particular, the waveform exhibits a gapless spectrum extending from 1 to 10 THz at 10% of its amplitude maximum, thereby facilitating nonlinear control over matter in this difficult-to-reach frequency range on the sub-picosecond time scale. Published by AIP Publishing.

• 出版日期2017-6-19