Resonant magnetic response of TiO2 microspheres at terahertz frequencies

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...

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Bibliographic Details
Published in:Applied physics letters 2012-02, Vol.100 (6)
Main Authors: Němec, H., Kadlec, C., Kadlec, F., Kužel, P., Yahiaoui, R., Chung, U.-C., Elissalde, C., Maglione, M., Mounaix, P.
Format: Article
Language:English
Subjects:
Condensed Matter
Electromagnetism
Engineering Sciences
Magnetic permeability
Magnetic resonance
Materials Science
Mathematical analysis
Metamaterials
Microparticles
Microspheres
Physics
Terahertz frequencies
Titanium dioxide
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3683540