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Proceedings Paper

Nano-composite magnetic material embedded on TiO2 pillars to realize magneto-optical resonant guided mode gratings
Author(s): B. Varghese; E. Gamet; D. Jamon; S. Neveu; L. Berthod; O. Shavdina; S. Reynaud; I. Verrier; C. Veillas; F. Royer
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Paper 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.

Paper Details

Date Published: 1 March 2016
PDF: 9 pages
Proc. SPIE 9750, Integrated Optics: Devices, Materials, and Technologies XX, 97500X (1 March 2016); doi: 10.1117/12.2209089
Show Author Affiliations
B. Varghese, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
E. Gamet, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
D. Jamon, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
S. Neveu, Lab. PHENIX, CNRS, Univ. Pierre et Marie Curie (France)
L. Berthod, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
O. Shavdina, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
S. Reynaud, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
I. Verrier, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
C. Veillas, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
F. Royer, Lab. Hubert Curien, CNRS, Univ. de Lyon (France)


Published in SPIE Proceedings Vol. 9750:
Integrated Optics: Devices, Materials, and Technologies XX
Jean-Emmanuel Broquin; Gualtiero Nunzi Conti, Editor(s)

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