Low birefringent magneto-optical waveguides fabricated via organic-inorganic sol-gel process

Abstract

Abstract. This paper is devoted to the study and the characterization of novel magneto-optical waveguides prepared via organic-inorganic sol-gel process. Thin silica/zirconia lms doped with magnetic nanoparticles were coated on glass substrate using dip-coating technique. After annealing, samples were UV-treated. Two dierent techniques were used to measure their properties: m-lines spectroscopy and free space ellipsometry. Results evidence low refractive index waveguides that combine a low modal birefringence (2 × 10 −4 ) with a Faraday rotation around 15• /cm (φ = 0.1%). The low birefringence is obtained with a soft UV treatement and a graded intrinsic anisotropy is evidenced for lms thicker than 5 µm. Therefore, we prove that the organic-inorganic sol-gel approach is very promising to realize magneto-optical waveguides with a nonreciprocal functionality such as TE-TM mode conversion.

Thermosensitive polymer-grafted iron oxide nanoparticles studied byin situdynamic light backscattering under magnetic hyperthermia

“…This angle proportional to the field intensity can be as high as 15°⋅cm -1 at 633 nm at high magnetic field (saturated moments) and changes in sign with the field direction. 28 Although we cannot exclude such direct influence of the magnetic field on the optical detection during in situ DLS measurement under RF magnetic field, we did not observe a variation of the backscattered intensity on any of the NPs used under a static magnetic field. This last control experiment was performed by inserting the sample holder of the remote head of the Cordouan VASCO Flex™ setup inside a 1000-turn coil producing a static magnetic field in the same direction as in the RF magnetic hyperthermia experiment, and with the same series of field intensities as for the magnetic hyperthermia experiments ( Figure S4).…”

Nonreciprocal TE–TM Mode Conversion Based on Photonic Crystal Fiber of Air Holes Filled With Magnetic Fluid Into a Terbium Gallium Garnet Fiber

“…Here, ΔN is determined by the geometrical birefringence ΔN geo and intrinsic birefringence ΔN i of the materials [23]. Their relationship can be expressed as…”

“…Thus, if the sample parameters are fixed, the optimization of the maximum rate of the mode conversion by applying H on the component with a direction parallel to the light beam z, where the magnitude depends on the kind of material, can help to reduce the modal birefringence [23]. Fig.…”

Magnetic nanoparticles-doped silica layer reported on ion-exchanged glass waveguide: towards integrated magneto-optical devices

“…Magneto-optical thin films are obtained by the sol-gel process, which is based on hydrolysis and condensation reactions of liquid precursor 16, 17 . The sol used in this study is composed of photopolymerizable organically modified silicon alkoxide, zirconium alkoxide or titanium isoproxide and methacylic acid.…”