Phonon spectroscopy with chirped shear and compressive acoustic pulses

Poyser, Caroline Louise; York, W.B.; Srikanthreddy, D.; Glavin, B.A.; Linnik, T.L.; Campion, R.P.; Akimov, A.V.; Kent, A.J.

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.

Citation

Poyser, C. L., York, W., Srikanthreddy, D., Glavin, B., Linnik, T., Campion, R., …Kent, A. (in press). Phonon spectroscopy with chirped shear and compressive acoustic pulses. Physical Review Letters, 119, Article 255502. https://doi.org/10.1103/PhysRevLett.119.255502

• Journal Article Type: Article
• Acceptance Date: Nov 7, 2017
• Online Publication Date: Dec 22, 2017
• Deposit Date: Nov 17, 2017
• Publicly Available Date: Dec 22, 2017
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 119
• Article Number: 255502
• DOI: https://doi.org/10.1103/PhysRevLett.119.255502
• Public URL: https://nottingham-repository.worktribe.com/output/901371
• Publisher URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.255502
• Contract Date: Nov 17, 2017