0000000000194790
AUTHOR
P. Moretti
Ion implantation effects in BaTiO3 single crystals
Abstract Thermally controlled helium implantation has been used to produce planar waveguides in BaTiO3 without noticeable depoling effects in the samples. Profiles for the ordinary and extraordinary refractive index are deduced from optical mode measurements. No annealing procedure is required. We report the effects of different ion fluences and energies in the MeV range on the waveguide properties.
Proton implanted waveguides in LiNbO3, KNbO3and BaTiO3
Abstract By using a Van De Graaf accelerator, planar waveguides in LiNbO3, KNbO3, and BaTiO3 are fabricated (at 300 K) by thermally controlled proton implantation. The waveguide properties are investigated by dark line mode spectroscopy. The reconstructed profiles closely follow the ion concentration profiles as determined by simulation (TRIM).
Niobium implantation effects in BaTiO3 and SrTiO3
Abstract Single crystals of BaTiO3 and SrTiO3 have been implanted at room temperature with 150 keV Nb+ ions to doses ranging from 1014 to 1017 ions cm2. The structure and the oxidation state of the damaged layer have been investigated by Rutherford backscattering-ion channeling and electron spectroscopy, respectively. SrTiO3 is rendered amorphous at relatively low doses of 2 × 1015 ions cm−2, but the damage is efficiently annealed at 450°C for 1 2 h. For both materials, the oxidation state of niobium varies from + 5 to + 2 along the depth. Moreover, a considerable chemical shift (2.3 eV) is observed for barium in BaTiO3.