The influence of different film thickness on grating coupling coefficient and transmittance has been analyzed based on a four-layer structure model of grating and matrix transformation, in which the optimum thickness of coating [(In2O3)9(SnO2)1][indium tin oxide (ITO)] is found, and the influence of environmental refractive index and wavelength for the effective refractive index of cladding mode is simulated in theory, respectively. A structure of long-period fiber grating (LPFG) coated with ITO of high-index nanothin film by the pulsed laser deposition technology is reported. The difference of refractive index sensitivity of LPFG with ITO coating or not is analyzed in experiment. The refractive index sensitivity of LPFG with ITO coating or not is −298 and −150 nm / RIU, respectively.
ZnSe:Co thin films were grown on quartz substrates at various ambient pressure by pulsed laser deposition. The propagation of plasma plume, the structure and optical propert ies of films at pressure of 1Pa to 10Pa had been investigated. With the ambient pressure increased, the angle of divergence and propagation distance of plasma plume changed, the crystal structure of films investigated by XRD showed that the crystal quality of films was promoted. The optical band gap and refractive index were analyzed by the transmission spectra. The optical band gap first decrease then increase with increasing deposition pressure, which may be associated with the quantum confinement effect. The refract ive index increased with increasing deposition pressure, which may be due to the promotion of the film density. The dispersion parameters, E0, Ed, the static refract ive index (n0) and static dielectric constant (ε0) were calculated according to the single oscillator model.
ZnO has attracted much attention because of its high-energy gap and exciton binding energy at room temperature. Compared to ZnO thin films, ZnGaO thin films are more resistive to oxidation and have smaller deformation of lattice. In this study, the high purity ZnSe and Ga2O3 powders were weighted at a molar ratio of 18:1. Se was oxidized to Se2O3 and separated from the mixture powders by using conventional solid state reaction method in air, and the ZnGaO ceramic target was prepared. We fabricated the ZnGaO films on silica glass by pulsed laser deposition (PLD) method under different oxygen pressure at room temperature. The as-grown films were tested by X-ray diffraction and atomic force microscope (AFM) to diagnose the crystal structure and surface morphology. Moreover, we obtained the optical transmittance of ZnGaO film and found that the electrical conductivity capacity varied with the increase of oxygen pressure.
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