Temporal superoscillations of subterahertz coherent acoustic phonons

Brehm, S.; Akimov, A. V.; Campion, R. P.; Kent, A. J.

Abstract

We observe coherent acoustic phonon superoscillations at subterahertz frequencies. The superoscillations result from the interference of optically excited coherent longitudinal acoustic phonon modes in a GaAs/AlGaAs superlattice. The superoscillations are seen in local temporal regions and their frequency is up to 60% larger than the highest-frequency excited and detected phonon mode. Such superoscillatory phonon pulses may potentially be used for high-resolution acoustic measurement in strong scattering media.

• Journal Article Type: Article
• Acceptance Date: Feb 28, 2020
• Online Publication Date: Apr 6, 2020
• Publication Date: Apr 6, 2020
• Deposit Date: Oct 13, 2020
• Publicly Available Date: Oct 13, 2020
• Journal: Physical Review Research
• Electronic ISSN: 2643-1564
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 2
• Issue: 2
• Article Number: 023009
• DOI: https://doi.org/10.1103/physrevresearch.2.023009
• Public URL: https://nottingham-repository.worktribe.com/output/4279361
• Publisher URL: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.023009