Poolman, Rhys Huw, Muljarov, Egor A.  ORCID: https://orcid.org/0000-0002-2878-4148 and Ivanov, Alexei
2010.
Terahertz response of acoustically driven optical phonons.
Physical Review. B, Condensed Matter and Materials Physics
81
(24)
, 245208.
10.1103/PhysRevB.81.245208
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Abstract
The manipulation of transverse-optical (TO)-phonon polaritons and the associated terahertz (THz) light field by means of an ultrasound acoustic wave is proposed and illustrated by calculating the TO-phonon-mediated THz response of acoustically pumped CuCl and TlCl crystals. We show the high-contrast acoustically induced change in the THz reflectivity and multiple THz Bragg replicas, which are associated with the far-infrared-active TO-phonon resonance driven by the ultrasonic wave. The effect, which stems from phonon anharmonicity and deals with the resonantly enhanced acousto-optical susceptibilities, refers to an operating acoustic intensity Iac∼1–100 kW/cm2 and frequency νac∼0.1–1 GHz. Due to the anomalously small interaction length between the acoustic and optical fields, possible applications of the effect are in THz spectroscopy and THz acousto-optic devices.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Additional Information: | 6 pp. |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| Last Modified: | 05 May 2023 23:38 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/7313 |
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