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Splitting of magnetic dipole modes in anisotropic TiO2 micro-spheres

Khromova, I; Kužel, P; Brener, I; Reno, JL; Chung Seu, U-C; Elissalde, C; Maglione, M; ... Mitrofanov, O; + view all (2016) Splitting of magnetic dipole modes in anisotropic TiO2 micro-spheres. Laser & Photonics Reviews , 10 (4) pp. 681-687. 10.1002/lpor.201600084. Green open access

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Abstract

Monocrystalline titanium dioxide (TiO2) micro-spheres support two orthogonal magnetic dipole modes at terahertz (THz) frequencies due to strong dielectric anisotropy. For the first time, we experimentally detected the splitting of the first Mie mode in spheres of radii inline imagem through near-field time-domain THz spectroscopy. By fitting the Fano lineshape model to the experimentally obtained spectra of the electric field detected by the sub-wavelength aperture probe, we found that the magnetic dipole resonances in TiO2 spheres have narrow linewidths of only tens of gigahertz. Anisotropic TiO2 micro-resonators can be used to enhance the interplay of magnetic and electric dipole resonances in the emerging THz all-dielectric metamaterial technology.

Type: Article
Title: Splitting of magnetic dipole modes in anisotropic TiO2 micro-spheres
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/lpor.201600084
Publisher version: http://dx.doi.org/10.1002/lpor.201600084
Language: English
Additional information: Copyright © 2016 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following Khromova, I; Kužel, P; Brener, I; Reno, JL; Chung Seu, U-C; Elissalde, C; Maglione, M; (2016) Splitting of magnetic dipole modes in anisotropic TiO 2 micro-spheres. Laser & Photonics Reviews , 10 (4) pp. 681-687 which has been published in final form at http://dx.doi.org/10.1002/lpor.201600084 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving, http://olabout.wiley.com/WileyCDA/Section/id-820227.html#terms
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1505821
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