Nano-composite magnetic material embedded on TiO2 pillars to realize magneto-optical resonant guided-mode gratings

B. Varghese; E. Gamet; D. Jamon; S. Neveu; L. Berthod; O. Shavdina; S. Reynaud; I. Verrier; C. Veillas; F. Royer

doi:10.1117/12.2209089

1 March 2016 Nano-composite magnetic material embedded on TiO₂ pillars to realize magneto-optical resonant guided mode gratings

B. Varghese, E. Gamet, D. Jamon, S. Neveu, L. Berthod, O. Shavdina, S. Reynaud, I. Verrier, C. Veillas, F. Royer

Author Affiliations +

Proceedings Volume 9750, Integrated Optics: Devices, Materials, and Technologies XX; 97500X (2016) https://doi.org/10.1117/12.2209089
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Periodic structuration of magnetic material is a way to enhance the magneto-optical behavior of optical devices like isolators. It is useful to reduce the footprint of such integrated devices or to improve their features. However, the structuration and/or integration of efficient magnetic materials on photonic platforms is still a difficult problem, because classical magneto-optical materials require an annealing temperature as high as 700°C. A novel wafer-scale approach is to incorporate that material into an already structured template through a single step deposition at low temperature. Using the dip-coating method, a magneto-optical thin film (~300nm) of CoFe₂O₄ nanoparticles in silica matrix prepared by sol-gel technique was coated on a 1D and 2D TiO₂ subwavelength gratings. Such gratings were realized by the patterning of TiO₂ films obtained by a sol-gel process. It was confirmed by Scanning Electron Microscope images that the magneto-optical composite completely occupies the voids of the 2D structuration showing a good compatibility between both materials. This composite shows a specific Faraday rotation of about 200°cm^-1 at 1,5μm for 1% of volume fraction of nanoparticles. Spectral studies of the transmission and the reflection of a 1D TiO₂ grating filled with the MO composite have evidenced the presence of a guided-mode optical resonance at 1,55μm. The position of this resonance was confirmed by numerical simulations, as well as its quite low efficiency. Based on simulations results, one can conclude that an increase of the grating depth is required to improve the efficiency of the resonance.

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B. Varghese, E. Gamet, D. Jamon, S. Neveu, L. Berthod, O. Shavdina, S. Reynaud, I. Verrier, C. Veillas, and F. Royer "Nano-composite magnetic material embedded on TiO₂ pillars to realize magneto-optical resonant guided mode gratings", Proc. SPIE 9750, Integrated Optics: Devices, Materials, and Technologies XX, 97500X (1 March 2016); https://doi.org/10.1117/12.2209089

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