M. El Jouad

Influence of Roughness Surfaces on Third-Order Nonlinear-Optical Properties of Erbium-Doped Zinc Oxide Thin Films

ABSTRACT Zinc oxide (ZnO) and erbium-doped zinc oxide (ZnO:Er) thin films were deposited on heated glass substrates using the spray pyrolysis technique. Third-order nonlinear-optical properties of the thin films have been investigated using the third harmonic generation (THG) at wavelength of 1064 nm in picosecond regime. The dependence of third-order nonlinear susceptibility and transmission characteristics on the thin films roughness has been evaluated. Third-order nonlinear optical susceptibility (χ(3)) values of the studied materials were in the remarkable range of 10−2 esu. The morphologic properties of the deposited films have been analyzed using x-ray diffraction (XRD) and atomic force microscopy (AFM) and the luminescence properties by cathodoluminescence (CL). A correlation between optical properties and structural properties is given.

Cathodoluminescence Properties of Zno Thin Films

The industry has a great need for high performance materials to feature well defined. These needs have prompted the development of methods of study and control of gradually more sophisticated based on the radiation-matter interaction. To identify the properties of materials, we must make a spectral analysis on the emitted photon using a spectrometer combined with a detection system. The analysis of the photon can take place directly in the form of an electrical current, as well as the spectrum received by the measurement system is represented by a function I (λ).

Effect of roughness on third-order nonlinear-optical susceptibility of rare earth doped zinc oxide thin films

Zinc oxide (ZnO) and erbium doped zinc oxide (ZnO:Er) thin films, were deposited on heated glass substrates using spray pyrolysis technique. Third-order nonlinear-optical properties of ZnO and ZnO:Er have been investigated by the third harmonic generation (THG) method at the wavelength of 1064 nm using nanosecond Nd3+:YAG laser radiation. The dependence of third order nonlinear susceptibility and transmission characteristics on the thin film roughness has been measured. Third order nonlinear optical susceptibility ( chi(3)) values of the studied materials were in the remarkable range of 10-12 esu. The deposited films have been analyzed using X-ray diffraction (XRD) and atomic force microscopy (AFM).

Effect of substrate temperature on cathodoluminescence of ITO thin films prepared by spray pyrolysis

Highly conducting and transparent tin-doped indium oxide (ITO) thin films were deposited on glass substrates by spray pyrolysis. The characterisation of ITO thin films prepared under different deposition parameters is investigated. The transmission, resistivity and luminescence of the films were found to be strongly dependent on these parameters. The films prepared at the optimum conditions exhibit low resistivity and optical transmission larger than 90% in the visible region. ITO cathodoluminescence films prepared at 450degC and 500degC has been studied. These samples exhibit a strong luminescence peaks in visible region at 460 nm and 650 nm.

Investigation on the nonlinear optical properties and luminescence for thin films based on Sn doped In 2 O 3 prepared by the reactive chemical pulverization

Summary form only given. Nonlinear optical properties and photoluminescence behavior of Tin-doped indium oxide (In 2 O 3 :Sn) thin films layers were investigate in detail. On heated glass substrates, we deposited these layers at different temperatures 400°C, 450°C and 500°C and different doping agent percentage, by the so called Spray Pyrolysis Technique, the reactive chemical pulverization.

The effects of sprayed lithium and erbium Co-doped ZnO thin films on the structural and cathodoluminescent properties

Summary form only given. Lithium and Erbium co-doped Zinc oxide thin films have been successfully deposited on heated glass substrates using spray pyrolysis technique. This study is an investigation of the Li effect on the enhancement of Cathodoluminescent (CL) intensity on the Er-monodoped. Crystallinity, morphology and luminescence characteristics were investigated in detail, by X-Ray Diffraction (XRD); Scanning Electron Microscopy (SEM) and Cathodoluminescent (CL). The Li-Er co-doped ZnO films show higher intensity of blue and red emissions than the Er monodoped ZnO films. The behaviour of that enhancement is attributed to the modification of the local symmetry of the Er3+ ion, which increases the intra 4f transition of Er3+ ion. Li+ ions also can reduce the OH groups in specimen, which is the other reason for enhancing the visible intensities. The blue and red emissions have an important effect to improve the capacity of data storage.

Third order non linear optical properties of ZnO:Al thin films prepared by spray pyrolysis

In this study, Zinc oxide (ZnO) and Aluminium doped zinc oxide (ZnO:Al) thin films were deposited by reactive chemical pulverization spray pyrolysis technique on heated glass substrates at 450°C. X-ray diffraction (XRD), Scanning electron microscopy (SEM) and third harmonic generation (THG) are used to characterize their structure , morphology and nonlinear optical properties as a function of Al concentration (0, 3, 5, 7 at %). The intensity of third order non linear optical susceptibility increase by incorporation of aluminium. A strong value of susceptibility χ(3) was found for films with a good crystallinity.

Study of nonlinear-optical properties and roughness surface of ZnO:Zr thin films

Zinc oxide (ZnO) and zirconium doped zinc oxide (ZnO:Zr) thin films were deposited by reactive chemical pulverization spray pyrolysis technique on heated glass substrates at 450degC using zinc and zirconium chlorides as precursors. Effect of zirconium dopant and surface roughness on the nonlinear optical properties was investigated using atomic force microscopy (AFM) and third harmonic generation (THG).The best value of susceptibility chi(3) was obtained from the doped films with less roughness. A strong third order nonlinear optical susceptibility chi(3) = 20,49 times10-12 (esu) of the studied films was found for the 5% doped sample at 450degC.

Physico-chemical characterization and study of nonlinear optical properties of tin and fluoride doped indium oxide thin films deposed by spray pyrolysis

The thin films of undoped oxide indium and doped oxide indium by fluorine and tin were prepared by SPRAY pyrolysis. These layers were deposited on glass substrates from the Indium chloride (InCl3), tin chloride (SnCl2;2H2O) and ammonium fluoride (NH4F).The microstructure, morphological, optical transmittance and chemical composition of these layers were studied by the X ray diffraction (XRD), the scanning electron microscopy(SEM), atomic force microscopy (AFM) and microanalysis (EDX) respectively. A study of luminescence by cathodoluminescence technique and a study of nonlinear susceptibility of the third order by the third harmonic generation (THG) technique of these thin films were carried out. The aim of our study is the optimization of luminescence as well as the non-linear response to a possible application in optoelectronics as transparent conductive electrode or in microelectronics fields.