TiO 2 waveguides thin films prepared by sol-gel method on glass substrates with and without ZnO underlayer

J Mater Sci: Mater Electron

Bouabellou

et al. 2022

Self Cite

Mgx Zn 1−x O thin lms were deposited on glass substrate with x varied between 0.01 and 0.05 by spray pyrolysis at a temperature of 450 °C. The structural investigation showed that all thin lms had ZnO wurtzite structure with a preferred (002) orientation. The gap energy was calculated using Tauc's plot and it decreased over the Mg content by 0.07 eV. The charge carriers' density dropped by an order of 10 5 as Mg content increased whereas the resistivity and the mobility increased. SEM observations revealed a signi cant difference between undoped and doped thin lms. A 632.8 nm laser source prism coupler revealed 2 optical modes for every thin lm in each Transverse Electric and Transverse Magnetic mode, the birefringence of the Mg doped lms was positive. Both ordinary and extraordinary refractive indexes were found to decrease as the Mg content increased. Great intention has been paid to the relation between the refractive, charge carriers density and the optical band gap.

Section: M-lines Measurementsmentioning

confidence: 99%

Optoelectronic and birefringence properties of weakly Mg-doped ZnO thin films prepared by spray pyrolysis

Bouachiba

J Mater Sci: Mater Electron

Bouabellou

et al. 2022

Self Cite

“…The effective index was evaluated by m-lines spectroscopy using the Snell-Decartes equation of refraction [43]:…”

Section: M-lines Measurementsmentioning

confidence: 99%

Optical properties and complex refractive index of Co doped ZnO waveguide thin films elaborated by spray pyrolysis

DJAABOUBE

Bouachiba

et al. 2022

Preprint

CoxZn1-xO (x = 0.00, 0.04, 0.08 and 0.10) thin films were sprayed pyrolysis onto ordinary glass substrates. The micro Raman spectroscopy revealed the presence of wurtzite structure in all films. The UV-Vis investigation showed good optical transmittance in the visible region with the increase in the absorption bands related to internal Co+2 d-d transitions over Co concentration. The optical gap energy decreased by 0.34 eV as Co doping increased, contrary to Urbach energy which increased by 230 meV. The SEM observation indicated obvious modification in the morphology of the films. M-lines spectroscopy measured the ordinary refractive index which was found to increase by 0.0156 as the Co doping increased. Cobalt doping provoked the extinction of light coupling and propagation in the films manifested as an increase in full width at the half maximum of the guided peaks and a decrease in the reflected intensity. This was due to the increase in the extinction coefficient measured by UV-Vis spectroscopy.

“…All films had four guiding modes (TE0, TE1, TM0, and TM1) two for each optical polarization (Transverse Electric mode (TE) and Transverse Magnetic mode (TM)) as illustrated in Figure 9. Using the dispersion equations for TE and TM polarizations, the optogeometric parameters can be calculated [57][58][59]. The effective indices, the films thicknesses and the birefringence values are presented in Table 2.…”

Section: M-lines Measurementsmentioning

confidence: 99%

Optoelectronic and Birefringence Properties of Weakly Mg Doped ZnO Thin films Prepared By Spray Pyrolysis.

Bouachibaa¹,

Bouabellou

et al. 2021

Preprint

MgxZn1−xO thin films were deposited on glass substrate with x varied between 0.01 and 0.05 by spray pyrolysis at a temperature of 450 °C. The structural investigation showed that all thin films had ZnO wurtzite structure with a preferred (002) orientation. The gap energy was calculated using Tauc’s plot and it decreased over the Mg content by 0.07 eV. The charge carriers’ density dropped by an order of 105 as Mg content increased whereas the resistivity and the mobility increased. SEM observations revealed a significant difference between undoped and doped thin films. A 632.8 nm laser source prism coupler revealed 2 optical modes for every thin film in each Transverse Electric and Transverse Magnetic mode, the birefringence of the Mg doped films was positive. Both ordinary and extraordinary refractive indexes were found to decrease as the Mg content increased. Great intention has been paid to the relation between the refractive, charge carriers density and the optical band gap.