6533b7d6fe1ef96bd1265dca
RESEARCH PRODUCT
Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer
Samuel M. HornettGerhard JakobTom SeifertEuan HendryJacopo BertolottiRosamund I. HerapathMathias KläuiTobias Kampfrathsubject
Materials scienceTerahertz radiationFOS: Physical sciencesPhysics::Opticsterahertz emission02 engineering and technologyDielectricpump wavelength01 natural sciences530Condensed Matter::Materials Science0103 physical sciencesStimulated emissionCommon emitter010302 applied physicsSpintronicsbusiness.industry021001 nanoscience & nanotechnologyspintronic trilayerWavelengthTransmission (telecommunications)Physics::Accelerator PhysicsOptoelectronics0210 nano-technologybusinessIntensity (heat transfer)Optics (physics.optics)Physics - Opticsdescription
We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic Fe layer between adjacent nonmagnetic W and Pt layers. We find that the efficiency of THz generation is essentially at for excitation by 150 fs pulses with center wavelengths ranging from 900 to 1500 nm, demonstrating that the spin current does not depend strongly on the pump photon energy. We show that the inclusion of dielectric overlayers of TiO2 and SiO2, designed for a particular excitation wavelength, can enhance the terahertz emission by a factor of of up to two in field.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-08-02 |