0000000000277532

AUTHOR

Samuel M. Hornett

showing 2 related works from this author

Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer

2018

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.

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 - Optics
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The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies

2017

The ultrafast dynamics and conductivity of photoexcited graphene can be explained using solely electronic effects.

Materials SciencePhysics::OpticsFOS: Physical sciences02 engineering and technology01 natural sciences7. Clean energylaw.inventionCondensed Matter::Materials ScienceElectrical resistivity and conductivitylawMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesPhysics::Atomic and Molecular ClustersPhysics::Chemical Physics010306 general physicsComputer Science::DatabasesResearch ArticlesPhysicsMultidisciplinaryCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsScatteringGraphenePhotoconductivitygraphene ultrafast carrier dynamicSciAdv r-articlesFermi energyPhysik (inkl. Astronomie)Condensed Matter Physics021001 nanoscience & nanotechnologyBoltzmann equation3. Good healthPhotoexcitationMultiple exciton generation0210 nano-technologyResearch ArticleScience Advances
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