Phonon Spectroscopy with Chirped Shear and Compressive Acoustic Pulses

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Abstract

Picosecond duration compressive and shear phonon wave packets injected into (311) GaAs slabs transform after propagation through ∼1 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 subterahertz phonon spectroscopy. Temporal gating of the chirped phonon pulse allows the selection of a narrow band phonon spectrum with a central frequency up to 0.4 THz for longitudinal and 0.2 THz for transverse phonons.

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Poyser, C. L., York, W. B., Srikanthreddy, D., Glavin, B. A., Linnik, T. L., Campion, R. P., … Kent, A. J. (2017). Phonon Spectroscopy with Chirped Shear and Compressive Acoustic Pulses. Physical Review Letters, 119(25). https://doi.org/10.1103/PhysRevLett.119.255502

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