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Resonant magnetic response of TiO2 microspheres at terahertz frequencies

Abstract : Spray-drying technique is used to fabricate spherical microparticles out of dissolved TiO2 nanoparticles. We show both experimentally and through numerical calculations that the microspheres support a Mie resonance, leading to an effective magnetic response. For this purpose, nearly single layers of microspheres were prepared and characterized by time-domain terahertz spectroscopy. We developed an experimental approach allowing simultaneous measurement of complex transmittance and reflectance of a thin layer, which in turn enables evaluation of its effective dielectric permittivity and effective magnetic permeability. Numerical finite-element-method calculations of the electromagnetic response show that the prepared microparticles are suitable for preparing a metamaterial with negative effective magnetic permeability.
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Contributor : Bernadette Bergeret <>
Submitted on : Monday, February 13, 2012 - 10:25:59 AM
Last modification on : Wednesday, May 27, 2020 - 2:30:07 PM

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H. Nemec, C. Kadlec, F. Kadlec, P. Kuzel, Riad Yahiaoui, et al.. Resonant magnetic response of TiO2 microspheres at terahertz frequencies. Applied Physics Letters, American Institute of Physics, 2012, 100 (6), pp.061117 (1-4). ⟨10.1063/1.3683540⟩. ⟨hal-00669368⟩



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