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Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization

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Mosley, C. D. W., Failla, Michele, Prabhakaran, D. and Lloyd-Hughes, James (2017) Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization. Scientific Reports, 7 . 12337. ISSN 2045-2322.

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Official URL: http://doi.org/10.1038/s41598-017-12568-0

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Abstract

We introduce a polarization-resolved terahertz time-domain spectrometer with a broadband (0.3-2.5THz), rotatable THz polarization state, and which exhibits minimal change in the electric field amplitude and polarization state upon rotation. This was achieved by rotating an interdigitated photoconductive emitter, and by detecting the orthogonal components of the generated THz pulse via electro-optic sampling. The high precision (<0.1°) and accuracy (<1.0°) of this approach is beneficial for the study of anisotropic materials without rotating the sample, which can be impractical, for instance for samples held in a cryostat. The versatility of this method was demonstrated by studying the anisotropic THz optical properties of uniaxial and biaxial oxide crystals. For uniaxial ZnO and LaAlO3, which have minimal THz absorption across the measurement bandwidth, the orientations of the eigenmodes of propagation were conveniently identified as the orientation angles that produced a transmitted THz pulse with zero ellipticity, and the birefringence was quantified. In CuO, a multiferroic with improper ferroelectricity, the anisotropic THz absorption created by an electromagnon was investigated, mapping its selection rule precisely. For this biaxial crystal, which has phonon and electromagnon absorption, the polarization eigenvectors exhibited chromatic dispersion, as a result of the monoclinic crystal structure and the frequency-dependent complex refractive index.

Item Type: Journal Article
Alternative Title:
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Terahertz spectroscopy, Refraction, Double, Anisotropy
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
Official Date: 26 October 2017
Dates:
DateEvent
26 October 2017Available
6 September 2017Accepted
Volume: 7
Article Number: 12337
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 7 September 2017
Date of first compliant Open Access: 2 October 2017
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDEngineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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