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., Akimov, A., & 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