NEMEC, H.; KADLEC, C.; KADLEC, F.; KUZEL, P.; YAHIAOUI, Riad; CHUNG SEU, U-Chan; ELISSALDE, Catherine; MAGLIONE, Mario; MOUNAIX, Patrick

doi:10.1063/1.3683540

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NEMEC, H.
Institute of Physics

KADLEC, C.
Institute of Physics

KADLEC, F.
Institute of Physics

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Applied Physics Letters. 2012, vol. 100, n° 6, p. 061117

American Institute of Physics

Résumé en anglais

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.< Réduire

Mots clés en anglais

Dielectric materials

Emission spectroscopy

Optical metamaterials

Terahertz spectroscopy

Finite-element analysis

Nanoparticle

Light scattering

Electromagnetic interactions

Laser micromachining

Transition metal oxides

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Resonant magnetic response of TiO2 microspheres at terahertz frequencies

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