Resonant magnetic response of TiO2 microspheres at terahertz frequencies
CHUNG SEU, U-Chan
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de recherches Paul Pascal [CRPP]
< Reduce
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de recherches Paul Pascal [CRPP]
Language
en
Article de revue
This item was published in
Applied Physics Letters. 2012, vol. 100, n° 6, p. 061117
American Institute of Physics
English 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 ...Read more >
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.Read less <
English Keywords
Dielectric materials
Emission spectroscopy
Optical metamaterials
Terahertz spectroscopy
Finite-element analysis
Nanoparticle
Light scattering
Electromagnetic interactions
Laser micromachining
Transition metal oxides
Origin
Hal imported