Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

To explore the capabilities of metallic spintronic thin-film stacks as a source of intense and broadband terahertz electromagnetic fields, we excite a W/CoFeB/Pt trilayer on a large-area glass substrate (diameter of 7.5 cm) by a femtosecond laser pulse (energy 5.5 mJ, duration 40 fs, wavelength 800 nm). After focusing, the emitted terahertz pulse is measured to have a duration of 300 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 amplitude maximum).