Terahertz response of acoustically driven optical phonons

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:	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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