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Rigid metamaterials were prepared by embedding TiO2 microspheres into polyethylene. These structures exhibit a series of Mie resonances where the lowest one is associated with a strong dispersion in the effective permeability. Using THz spectroscopy, we confirmed the magnetic nature of the observed resonance.
We developed a new chemical procedure for the fabrication of TiO2 dielectric microspheres. We also proposed an elegant way to evaluate of the effective dielectric permittivity and magnetic permeability of single-layer films made of independent resonators. The resonant magnetic response of was observed in the THz range. Experimental results are in agreement with simulations.
We report on metamaterials which exhibit a tunable interval of negative effective permeability within 0.2-0.36 THz. They consist of a strontium titanate platelet, which shows a high and temperature tunable permittivity, with an array of laser engraved slits. The negative permeability then is due to a resonant confinement of the electromagnetic field within the rods. The range of negative permeability...
We present metamaterials for the terahertz range consisting of micromachined thin strontium titanate platelets. They display electromagnetic resonances with negative permeability around a frequency which is tunable as the intrinsic material permittivity depends upon temperature.
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