In the framework of optical telecommunication systems, many functions are integrated on the same substrate.
Nevertheless, one of the most important, such as isolation, is achieved using discrete components. It is based on
magnetic materials which are always difficult to integrate with classical technologies. This is due to the annealing
temperature of magnetic materials. In this paper we present another way for the realisation of such components. We use
a dip coating process to report a magnetic nanoparticles doped silica layer on ion-exchanged glass waveguide. The
advantages of this method is discussed and we demonstrate its compatibility with ion-exchanged technology. By varying
the refractive index of the layer, we can adjust the interaction between the waveguide and the magneto-optical layer.
This paper presents a magnetooptical way to reduce the modal birefringence of planar waveguides, which is a critical point for applications. Indeed, composite material, made of Cobalt ferrite (CoFe2O4) nanoparticles embedded in a silica/zirconia matrix by the sol-gel method, are used to develop a phase matched magnetooptic planar waveguides. Such thin composite films coated on a pyrex slide using the dip-coating technique were studied. They were submitted to a UV-treatment, under an applied magnetic field. Two techniques were used to characterize these thin films: M-lines spectroscopy and Ellipsometry. Results show the dependence of the modal birefringence ΔN value as well as the TE-TM phase mismatch on the magnetic field orientation (in plane or out of plane) applied during the UV exposure phase. They prove that a phase match is achieved on a waveguide having a 1,5 refractive index and 1,8 μm of thickness, at 820 nm.
Interpretations of these results, due to a linear permanent anisotropy led by the nanoparticles orientation in the film, are given.
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