Coherent phonon optics in a chip with an electrically controlled active device

Akimov, Andrey; Poyser, Caroline L.; Kent, Anthony J.; CAMPION, RICHARD

Abstract

Phonon optics concerns operations with high-frequency acoustic waves in solid media in a similar way to how traditional optics operates with the light beams (i.e. photons). Phonon optics experiments with coherent terahertz and sub-terahertz phonons promise a revolution in various technical applications related to high-frequency acoustics, imaging, and heat transport. Previously, phonon optics used passive methods for manipulations with propagating phonon beams that did not enable their external control. Here we fabricate a phononic chip, which includes a generator of coherent monochromatic phonons with frequency 378?GHz, a sensitive coherent phonon detector, and an active layer: a doped semiconductor superlattice, with electrical contacts, inserted into the phonon propagation path. In the experiments, we demonstrate the modulation of the coherent phonon flux by an external electrical bias applied to the active layer. Phonon optics using external control broadens the spectrum of prospective applications of phononics on the nanometer scale.

• Journal Article Type: Article
• Acceptance Date: Jan 6, 2015
• Publication Date: Feb 5, 2015
• Deposit Date: May 1, 2018
• Publicly Available Date: Feb 21, 2019
• Journal: Scientific Reports
• Print ISSN: 2045-2322
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Article Number: 8279
• DOI: https://doi.org/10.1038/srep08279
• Public URL: https://nottingham-repository.worktribe.com/output/1112144
• Publisher URL: https://www.nature.com/articles/srep08279
• PMID: 00034883