C. L. Poyser, W. B. York, D. Srikanthreddy, B. A. Glavin, T. L. Linnik, R. P. Campion, A. V. Akimov, and A. J. Kent
https://journals.aps.org/prl/accepted/0207dYadSf71666e44a71350956c6f0a0ce2b8d9d
Picosecond duration compressive and shear phonon wavepackets injected into (311) GaAs slabs transform after propagation through \sim1 mm into chirped acoustic pulses with a frequency increasing in time due to phonon dispersion. By probing the temporal optical response to coherent phonons in a near surface layer of the GaAs slab, we show that phonon chirping opens a transformational route for high-sensitivity terahertz and sub-terahertz phonon spectroscopy. Temporal gating of the chirped phonon pulse allows the selection of a narrow band phonon spectrum with a central frequency up to \SI{0.4}{\tera \hertz} for longitudinal and \SI{0.2}{\tera \hertz} for transverse phonons.
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