6533b86cfe1ef96bd12c8219
RESEARCH PRODUCT
Ultrabroadband single-cycle terahertz pulses with peak fields of 300 kV cm-1 from a metallic spintronic emitter
Gerhard JakobMathias KläuiStephan WinnerlMohsen SajadiTom SeifertTobias KampfrathMartin WolfSamridh JaiswalSamridh Jaiswalsubject
Electromagnetic fieldMaterials sciencePhysics and Astronomy (miscellaneous)Terahertz radiationFOS: Physical sciences02 engineering and technology53001 natural scienceslaw.inventionlaw0103 physical sciencesCommon emitter010302 applied physicsCondensed Matter - Materials Sciencebusiness.industryMaterials Science (cond-mat.mtrl-sci)021001 nanoscience & nanotechnologyLaser3. Good healthPulse (physics)WavelengthAmplitudeFemtosecondOptoelectronics0210 nano-technologybusinessOptics (physics.optics)Physics - Opticsdescription
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 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 amplitude maximum, thereby facilitating nonlinear control over matter in this difficult-to-reach frequency range and on the sub-picosecond time scale.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-06-19 |