Abstract:Zinc oxide films were deposited on glass substrates by RF reactive magnetron sputtering and post-annealed in vacuum at 100, 200, and 300 8C. Structural and optical properties of films were obtained using X-ray diffraction and UV-visible spectroscopy. Optical parameters were extracted from transmittance curves using the single-oscillator Drude-Lorentz model. The evolution of the optical and structural properties of films with the annealing process was investigated. The films crystallized into the hexagonal würz… Show more
“…This result reveals that all the obtained films are of pure phase composition and have a preferential c-axis growth orientation. 22 And with the increase in SGP, the relative intensity of (002) peak increased initially and then decreased, in which that of the films deposited under the SGP of 1.0 Pa was the strongest. 4 XRD patterns for the zinc oxide films deposited under different SGPs…”
Oxygen-deficient zinc oxide thin films were deposited by radio frequency magnetron sputtering with a sintered zinc oxide ceramic target under an atmosphere of manipulated sputtering gas pressure (SGP). Under the designed deposition conditions, all the prepared films were of hexagonal würtzite structure with c-axis as the preferential growth orientation. With increasing SGP, the film thickness, deposition rate, grain size and atomic ratio of O to Zn in the films initially increased and then decreased. Interestingly, when the SGP was low, the main defects in the films were oxygen vacancies; when it was high, the dominant defects were interstitial zinc; but when it was in a moderate value, the film composition might be relatively close to the stoichiometric ZnO, possessing the least number of defects. As a result, the electrical resistivity of the films first increased and then dropped down as the SGP increased.
“…This result reveals that all the obtained films are of pure phase composition and have a preferential c-axis growth orientation. 22 And with the increase in SGP, the relative intensity of (002) peak increased initially and then decreased, in which that of the films deposited under the SGP of 1.0 Pa was the strongest. 4 XRD patterns for the zinc oxide films deposited under different SGPs…”
Oxygen-deficient zinc oxide thin films were deposited by radio frequency magnetron sputtering with a sintered zinc oxide ceramic target under an atmosphere of manipulated sputtering gas pressure (SGP). Under the designed deposition conditions, all the prepared films were of hexagonal würtzite structure with c-axis as the preferential growth orientation. With increasing SGP, the film thickness, deposition rate, grain size and atomic ratio of O to Zn in the films initially increased and then decreased. Interestingly, when the SGP was low, the main defects in the films were oxygen vacancies; when it was high, the dominant defects were interstitial zinc; but when it was in a moderate value, the film composition might be relatively close to the stoichiometric ZnO, possessing the least number of defects. As a result, the electrical resistivity of the films first increased and then dropped down as the SGP increased.
“…For regions λ > λ ps , an almost constant transmittance or transparent zone is expected. A drop in the transmittance is expected in the IR region at the onset of vibrational modes in the lattice [19,20].…”
“…Applying the singleoscillator model developed by Wemple and Domenico, ε ∞ (dielectric constant, real part, at high-frequency values, for electronic transitions) and ε 0 (static constant, real part, at low-frequency values, related to the lattice contribution) were extracted [19]. A detailed procedure about how to use these models has been published by us elsewhere [20].…”
In this work, a set of titanium nitrides thin-films was synthesized with the technique of reactive RF and DC magnetron-sputtering. To demonstrate the versatility and effectiveness of the deposition technique, thin films were deposited onto different fiber structures varying the deposition parameters for optical applications as saturable absorbers in passively q-switched fiber lasers and as lossy mode resonance fiber refractometers. After deposition, optical and electronical properties of samples were characterized by UV–Vis and XPS spectroscopies, respectively. Samples presented coexisting phases of Ti nitride and oxide, where the nitride phase was non-stoichiometric metallic-rich, with a band gap in the range of Eg = 3.4–3.7 eV. For all samples, glass substrates were used as templates, and on top of them, optical fibers were mounted to be covered with their respective titanium compounds.
“…At the onset of the absorption edge, the optical band gap ( E g ) can be obtained through Tauc curves. Details about this method have been described [41]. In these curves, a graph of (αE) 2 (eV 2 cm −2 ) versus E (eV) is constructed.…”
Section: Deposition Of Azo Films On Fibers and Coating Characterizmentioning
confidence: 99%
“…Concerning the values of E g found for the samples, no meaningful difference existed among them. In an earlier work, values of E g ~3.2 eV were obtained for RF-grown ZnO films using the same equipment used to grow the current AZO films [41]. For AZO films prepared with RF and DC sputtering techniques, authors report that values of E g showed variations dependent on the deposition conditions.…”
Section: Deposition Of Azo Films On Fibers and Coating Characterizmentioning
In this work, we demonstrated lossy mode resonance (LMR) generation in optical fiber structures based on multimode fibers coated with aluminum-doped zinc oxide (AZO) films. AZO thin films were deposited by using radio frequency magnetron sputtering. In order to exhibit the usefulness of the LMR effect for sensing applications in optical fiber based systems, the deposition conditions of the AZO film coatings were set to obtain the second LMR order within the 1.55 µm wavelength range. An optical transmission configuration setup was used to investigate the LMR effect on fiber structures based on the use of no-core and cladding-removed multimode fibers coated with AZO films synthesized from metallic sputtering targets with different proportions of Zn:Al, 92:8% and 98:2%, at atomic concentrations. The optical and electrical/chemical features of the AZO films were characterized with UV–vis and XPS spectroscopy, respectively. The optical response of the proposed sensing configuration to refractive index (RI) variations was experimentally demonstrated. For the best approach, the sensitivity of wavelength displacement to RI variations on the liquid surrounding media was found to be 1214.7 nm/RIU.
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