Far-infrared response of acoustically modulated transverse optical-phonon polaritons

Poolman, Rhys Huw, Muljarov, Egor A. ORCID: https://orcid.org/0000-0002-2878-4148 and Ivanov, Alexei 2011. Far-infrared response of acoustically modulated transverse optical-phonon polaritons. IET Optoelectronics 5 (3) , pp. 128-132. 10.1049/iet-opt.2010.0063

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Abstract

The authors propose a scheme to achieve strong modification of the light properties in the terahertz (THz) range and in particular up to 70% changes in the THz reflectivity of CuCl, TlCl and LiNbO3 crystals. This is realised by using transverse optical (TO) phonons as a mediator in the interaction between an acoustic wave (AW) and a THz light field, via the strong anharmonicities of the interatomic potential. Their numerical modeling of CuCl, TlCl and LiNbO3 crystals also predicts that these effects are tunable by applying various coherent AWs from sub-GHz to few GHz frequency. The length of the interaction between electromagnetic and acoustic fields is also greatly reduced compared to conventional acousto-optics. The modifications of the reflectivity spectrum are because of single and multiple intra-branch phonon transitions within the TO-phonon polariton dispersion branches.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	CuCl , LiNbO3 , THz light field , THz reflectivity , TlCl , acoustic fields , acoustic wave , acoustically modulated transverse optical-phonon polaritons , anharmonicity , electromagnetic fields , far-infrared response , interatomic potential , numerical modeling , phonon polariton dispersion branches , terahertz reflectivity
Publisher:	IEEE
ISSN:	1751-8768
Last Modified:	20 Oct 2022 10:00
URI:	https://orca.cardiff.ac.uk/id/eprint/33817

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