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Experimental study of 3D magneto-photonic crystals made of silica inverse opals doped by magnetic nanoparticles

Abstract : For telecommunication systems the isolator is the only element, which has not been integrated yet, because of the high temperature (~700 °C) annealing process which is required for the crystallization of magnetic materials. Due to the non-reciprocal behavior of the magneto-optical effects, this device assures that the transmitted light passes in one direction, but it blocks the backward propagation into the laser and avoids damage risk or instabilities. To overcome this compatibility problem and increase the magneto-optical effect, a composite material arranged as 3D photonic crystal has been elaborated by impregnating polystyrene direct opals with magnetic nanoparticles(CoFe2O4) doped metallic precursor solution using low temperature sol-gel process. Firstly, we have shown by calculation, that the use of a dilute magnetic material with a relatively low refractive index in a 1D photonic crystal can increase the merit factor compared to a single magnetic monolayer. To obtain a sufficient Faraday rotation, the volume fiaction of magnetic nanoparticles had to be increased. We managed to reach 40%, whereas this rate was only a few percent at the beginning of this work. The main result of this thesis is that the Faraday rotation of the realized magneto-photonic crystals showed an enhancement at the edges of the photonic band gap comparing to the single monolayer
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https://tel.archives-ouvertes.fr/tel-00700481
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Submitted on : Wednesday, May 23, 2012 - 11:44:30 AM
Last modification on : Wednesday, November 20, 2019 - 2:59:13 AM
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  • HAL Id : tel-00700481, version 1

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Renata Kékesi. Experimental study of 3D magneto-photonic crystals made of silica inverse opals doped by magnetic nanoparticles. Other. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. English. ⟨NNT : 2011STET4014⟩. ⟨tel-00700481⟩

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