Measurement of a phonon-polariton dispersion curve by varying the excitation wavelength

Knighton, Brittany E.; Dastrup, Blake S.; Johnson, Courtney E.; Johnson, Jeremy A.

doi:10.1103/physrevb.97.214307

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…In addition, these methods are only applicable to inversion-symmetry broken systems where the polaritons are simultaneously Raman active. Other methods extract the polariton wavevector by satisfying the phase-matching condition 23 , 24 , where a frequency sweep is necessary to map out the dispersion. Recent advances in the generation of stable terahertz (THz) laser pulses have opened new possibilities to directly measure the polariton dispersion by using time-domain THz spectroscopy (TDTS) 25 .…”

Section: Introductionmentioning

confidence: 99%

Time-of-flight detection of terahertz phonon-polariton

Luo,

Ilyas,

Hoegen

et al. 2024

Nat Commun

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A polariton is a fundamental quasiparticle that arises from strong light-matter interaction and as such has attracted wide scientific and practical interest. When light is strongly coupled to the crystal lattice, it gives rise to phonon-polaritons (PPs), which have been proven useful in the dynamical manipulation of quantum materials and the advancement of terahertz technologies. Yet, current detection and characterization methods of polaritons are still limited. Traditional techniques such as Raman or transient grating either rely on fine-tuning of external parameters or complex phase extraction techniques. To overcome these inherent limitations, we propose and demonstrate a technique based on a time-of-flight measurement of PPs. We resonantly launch broadband PPs with intense terahertz fields and measure the time-of-flight of each spectral component with time-resolved second harmonic generation. The time-of-flight information, combined with the PP attenuation, enables us to resolve the real and imaginary parts of the PP dispersion relation. We demonstrate this technique in the van der Waals magnets NiI2 and MnPS3 and reveal a hidden magnon-phonon interaction. We believe that this approach will unlock new opportunities for studying polaritons across diverse material systems and enhance our understanding of strong light-matter interaction.

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Section: Introductionmentioning

confidence: 99%

Time-of-flight detection of terahertz phonon-polariton

Luo,

Ilyas,

Hoegen

et al. 2024

Nat Commun

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Terahertz waveform considerations for nonlinearly driving lattice vibrations

Knighton

Hardy

Johnson

et al. 2019

Journal of Applied Physics

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High-field terahertz (THz) spectroscopy is applied to nonlinearly excite the E phonon-polariton vibrational coordinate in LiNbO3. We compare three THz sources to show that by optimizing the THz waveform, we can drive the atomic motion to large amplitudes and observe nonlinear effects. To maximize the atomic displacement, we show that the spectral amplitude at the resonant frequency of the mode (3.8 THz) is more important than the THz peak electric-field strength. Z-scan and simple 2-dimensional (2D) THz pulse-shaping measurements confirm this. In addition to the effects of an anharmonic potential energy surface that can describe the nonlinear behavior of the excited mode, we also consider a 2-photon absorption mechanism that may be a competing nonlinear excitation pathway. We consider the effects of each model on the observed responses in single-pulse power-dependent measurements, z-scan measurements, and simple 2D measurements, providing important guidance for future measurements to experimentally investigate nonlinear vibrational excitation in solid materials.

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Effect of metal nanoparticles on polariton dispersion in low dimensional systems

Pon¹,

Wilson²

2019

Mater. Res. Express

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Measurement of a phonon-polariton dispersion curve by varying the excitation wavelength

Cited by 4 publications

References 22 publications

Time-of-flight detection of terahertz phonon-polariton

Time-of-flight detection of terahertz phonon-polariton

Terahertz waveform considerations for nonlinearly driving lattice vibrations

Effect of metal nanoparticles on polariton dispersion in low dimensional systems

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