6533b835fe1ef96bd129ea7a

RESEARCH PRODUCT

Modulating the polarization of broadband terahertz pulses from a spintronic emitter at rates up to 10 kHz

Lukas NadvornikTom SeifertMartin BorchertGeorg WoltersdorfOliver GueckstockMathias KläuiGeorg SchmidtMartin WolfGerhard JakobTobias Kampfrath

subject

Materials science530 PhysicsSpatial light modulatorsTerahertz radiationPhysics::OpticsLow-noise modulation spectroscopy02 engineering and technologyNonlinear optical crystals01 natural sciencesspintronic terahertz emittersElectric field5390103 physical sciencesElectromagnetic pulse010302 applied physics500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne PhysikCondensed Matter::Otherbusiness.industryLinear polarizationNonlinear spectroscopyBroadband terahertz pulses530 Physik021001 nanoscience & nanotechnologyPolarization (waves)MagnetostaticsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsMagnetic fieldModulationOptoelectronics0210 nano-technologybusinessModulation spectroscopy

description

Reliable modulation of terahertz electromagnetic waveforms is important for many applications. Here, we rapidly modulate the direction of the electric field of linearly polarized terahertz electromagnetic pulses with 1–30 THz bandwidth by applying time-dependent magnetic fields to a spintronic terahertz emitter. Polarity modulation of the terahertz field with more than 99% contrast at a rate of 10 kHz is achieved using a harmonic magnetic field. By adding a static magnetic field, we modulate the direction of the terahertz field between angles of, for instance, −53° and 53° at kilohertz rates. We believe our approach makes spintronic terahertz emitters a promising source for low-noise modulation spectroscopy and polarization-sensitive techniques such as ellipsometry at 1–30 THz.

yearjournalcountryeditionlanguage
2021-07-16Optica
https://doi.org/10.1364/optica.430504