Preparation and optical parameter characterization of two aldehyde derivative thin films for photonic applications by drop casting method
Raveendra MelavankiS. VaijayanthimalaBasappa Chanabasappa YallurVikas M. ShelarDiksha SinghKishor Kumar SadasivuniN. R. Patil
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Abstract In this study, thin films of polymer poly(methyl methacrylate) were prepared using a drop casting method. Two newly synthesized aldehyde derivatives, 2‐bromomalonaldehyde and 5,6‐dihydroimidazo[2,1‐b]thiazole‐2‐carbaldehyde, were used at different concentrations to dope the films. The prepared films were transparent and therefore studied for application in photonics. Optical characterization of the samples was carried out using different spectroscopy techniques. Absorption spectra for both samples were obtained using a UV–vis light spectrophotometer. Other significant optical parameters, such as refractive index, extinction coefficient, and band gap energies, were calculated from the absorption spectra. The effect of doping concentration on these parameters was studied. Emission spectra were obtained using a fluorescence spectrophotometer and the effect of doping was observed. Fourier transform infrared spectra of the doped films were obtained and compared with the pure compound to note changes in peak values and peak intensity. This present work studied the effect of doping on optical properties and examined the application of the samples for photonics.Keywords:
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Se90Cd10-xInx (x=2,4,6 &8) thin films have been deposited onto a chemically cleaned glass substrate by thermal evaporation technique under vacuum. The effects of different doping concentration of In have been investigated X-ray diffraction technique has been employed to investigate the structural characterization of the films. X-ray diffraction measurement indicates that the Se90Cd10-xInx films possess polycrystalline structure. Absorption spectra measured at normal incidence in the wavelength range 400-1100 nm have been analyzed for the optical characterization of the thin films under consideration. The optical constants (absorption coefficient (α), extinction coefficient (k)) and optical band gap Eg have been calculated. The absorption coefficient (α) is found to increase with photon energy. It has been found that extinction coefficient (K) decreases with increase in wavelength (λ). Optical band gap (Eg) has also been evaluated for the Se90Cd10-xInx thin films with different compositions. It has been found that optical band gap (Eg) increases with In incorporation in Se90Cd10-xInx alloys.
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The sprayed pyrolysis technique was carried out to prepare CuO thin films with different Mn-doping. Optical properties were calculated by recording the absorption spectra by UV-Visible spectrophotometer. The absorbance and absorption coefficient are increased with increasing Mn-doping in the CuO thin films. While the energy gap decreased from 2 eV before doping to 1.91 eV after 4% Mn-doping. In addition, extinction coefficient, and skin depth are decreased with increasing Mn-dopingin the CuO thin films.
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The optical properties of δ-Bi2O3 thin films were investigated using spectroscopic ellipsometry and optical absorption spectrum. δ-Bi2O3 thin films were grown on Si and quartz substrates under different oxygen flow ratios (OFR) by radio frequency reactive magnetron sputtering. The Tauc-Lorentz dispersion method was adopted to model the optical dispersion functions of the thin films. The optical bandgap was obtained by three different methods. It was found that refractive index and extinction coefficient decrease, and the optical bandgap has a slight blue shift with increasing the OFR. Factors influencing the optical constants and optical bandgap are discussed.
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