Phonon spectroscopy with chirped shear and compressive acoustic pulses

Poyser, Caroline Louise and York, W.B. and Srikanthreddy, D. and Glavin, B.A. and Linnik, T.L. and Campion, R.P. and Akimov, A.V. and Kent, A.J. (2017) Phonon spectroscopy with chirped shear and compressive acoustic pulses. Physical Review Letters . ISSN 1079-7114 (In Press)

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Abstract

Picosecond duration compressive and shear phonon wavepackets 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 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 0:4 THz for longitudinal and 0:2 THz for transverse phonons.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Depositing User: Eprints, Support
Date Deposited: 17 Nov 2017 14:46
Last Modified: 18 Nov 2017 12:13
URI: http://eprints.nottingham.ac.uk/id/eprint/48213

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