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Terahertz response of acoustically driven optical phonons

Poolman, Rhys Huw, Muljarov, Egor A. 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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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: 04 Jun 2017 01:59

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