Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization
We introduce a polarization-resolved terahertz time-domain spectrometer with a broadband (0.3-2.5 THz), 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 photocondu...
| Asıl Yazarlar: | , , , |
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| Materyal Türü: | Journal article |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
Springer Nature
2017
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| _version_ | 1826262476040175616 |
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| author | Mosley, C Failla, M Prabhakaran, D Lloyd-Hughes, J |
| author_facet | Mosley, C Failla, M Prabhakaran, D Lloyd-Hughes, J |
| author_sort | Mosley, C |
| collection | OXFORD |
| description | We introduce a polarization-resolved terahertz time-domain spectrometer with a broadband (0.3-2.5 THz), 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. |
| first_indexed | 2024-03-06T19:36:46Z |
| format | Journal article |
| id | oxford-uuid:1f50d78a-a85e-43b1-8fd8-a9dffe4ce56c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:36:46Z |
| publishDate | 2017 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:1f50d78a-a85e-43b1-8fd8-a9dffe4ce56c2022-03-26T11:21:09ZTerahertz spectroscopy of anisotropic materials using beams with rotatable polarizationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1f50d78a-a85e-43b1-8fd8-a9dffe4ce56cEnglishSymplectic Elements at OxfordSpringer Nature2017Mosley, CFailla, MPrabhakaran, DLloyd-Hughes, JWe introduce a polarization-resolved terahertz time-domain spectrometer with a broadband (0.3-2.5 THz), 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. |
| spellingShingle | Mosley, C Failla, M Prabhakaran, D Lloyd-Hughes, J Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| title | Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| title_full | Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| title_fullStr | Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| title_full_unstemmed | Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| title_short | Terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| title_sort | terahertz spectroscopy of anisotropic materials using beams with rotatable polarization |
| work_keys_str_mv | AT mosleyc terahertzspectroscopyofanisotropicmaterialsusingbeamswithrotatablepolarization AT faillam terahertzspectroscopyofanisotropicmaterialsusingbeamswithrotatablepolarization AT prabhakarand terahertzspectroscopyofanisotropicmaterialsusingbeamswithrotatablepolarization AT lloydhughesj terahertzspectroscopyofanisotropicmaterialsusingbeamswithrotatablepolarization |