scholarly journals Linear Optical Properties of Zinc Borotellurite Glass Doped with Lanthanum Oxide Nanoparticles for Optoelectronic and Photonic Application

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Faznny Mohd Fudzi ◽  
Halimah Mohamed Kamari ◽  
Amirah Abd Latif ◽  
Azlan Muhammad Noorazlan
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Fibers ◽  
Lanthanum Oxide ◽  
Materials Science ◽  
Molar Fraction ◽  
Fiber Material ◽  
Optical Parameter ◽  
Oxide Nanoparticles ◽  
Nonbridging Oxygen

Enhancing the optical properties of glasses for the sake of optical application in various fields is an ongoing challenge in materials science and technology. Thus, the optical properties of zinc borotellurite glass doped with lanthanum oxide nanoparticles (La2O3 NPs) with the chemical composition of {[(TeO2)0.7(B2O3)0.3]0.7(ZnO)0.3}1−x (La2O3 NPs)x, where x = 0.01, 0.02, 0.03, 0.04, and 0.05 molar fraction, have been investigated. Characterization techniques such as x-ray diffraction, Fourier Transform Infrared Spectroscopy, and Ultraviolet-Visible Spectroscopy are employed to yield the structural properties and optical parameter of the glass. The amorphous nature of the fabricated glasses is confirmed with the presence of a broad hump via XRD diffraction pattern. The decreasing amount of high polarizable nonbridging oxygen as the concentration of La2O3 NPs increases has contributed to the increasing trend of energy band gap in the range of 2.70 to 3.52 eV and decreasing value of refractive index between 2.34 and 2.48. The fabricated glasses that have a higher refractive index than the widely used fiber material, pure silica glass, indicate that zinc borotellurite glass doped with lanthanum nanoparticles is a promising material to be applied as optical fibers.

scholarly journals Synthesis and Optical Characterization of Zinc Borotellurite Glass Doped with Lanthanum Nanoparticles

2017 ◽  
Vol 268 ◽  
pp. 23-27
Author(s):  
M.F. Faznny ◽  
Mohamed Kamari Halimah ◽  
Amirah Abdul Latif ◽  
Shahrim Mustafa Iskandar
Keyword(s):  
Refractive Index ◽  
Molar Fraction ◽  
Optical Parameter ◽  
Nonbridging Oxygen ◽  
Energy Band Gap ◽  
Absorption Bands ◽  
Increasing Trend ◽  
Ftir Technique ◽  
Quenching Method

A glass series with chemical composition of {[(TeO2)0.7(B2O3)0.3]0.7(ZnO)0.3}1-x (La NPs)x where x = 0.01, 0.02, 0.03, 0.04 and 0.05 molar fraction was synthesized through conventional melt-quenching method. The fabricated glasses were characterized by using UV-Vis and FTIR technique in the range of 220 to 800 nm and 280 to 2000 cm-1 respectively. Various absorption bands that were recorded in FTIR spectra indicates the presence of TeO4, BO3 and BO4 unit. In this research, indirect energy band gap showed an increasing trend while refractive index values decreases as amount of La NPs increases due to the decrement of high polarizability nonbridging oxygen number in the glass system. Other optical parameter that also take part in governing the value of refractive index such as electronic polarizability was also determined.

Preparation and Characterization of Ophthalmic Lens Materials Containing Titanium Silicon Oxide and Silver Nanoparticles

2015 ◽  
Vol 15 (10) ◽  
pp. 8016-8022 ◽  
Author(s):  
Jung-Won No ◽  
Dong-Hyun Kim ◽  
Min-Jae Lee ◽  
Duck-Hyun Kim ◽  
Tae-Hun Kim ◽  
...  
Keyword(s):  
Contact Angle ◽  
Silver Nanoparticles ◽  
Refractive Index ◽  
Optical Properties ◽  
Silicon Oxide ◽  
Saline Solution ◽  
Oxide Nanoparticles ◽  
Silicon Oxide Nanoparticles ◽  
Titanium Silicon

Hydrogel ophthalmic lenses containing fluorine-substituted aniline group, titanium silicon oxide nanoparticles, and silver nanoparticles were copolymerized, and the physical and optical properties of the hydrogel lenses were measured. To produce the hydrophilic ophthalmic lenses, the additives were added to the mixture containing HEMA, NVP, MA, EGDMA, and AIBN. The cast mold method was used for the manufacture of the hydrogel ophthalmic lenses, and the produced lenses were completely soaked in a 0.9% NaCl normal saline solution for 24 hours for hydration. The physical properties of the produced macromolecule showed that the water content was 32.5–37.6%, the refractive index was 1.450–1.464, the UV-B transmittance was 0.5–35.2%, and the contact angle was between 56 and 69°. Also, the addition of aniline, titanium silicon oxide, and silver nanoparticles allowed the ophthalmic lenses to block UV. These results show that the produced macromolecule can be used as hydrophilic lenses for ophthalmologic purposes that can block UV.

Reliability Assessment of Optical Fibers and Fiber Gratings

1998 ◽  
Vol 531 ◽  
Author(s):  
Sriraman Kannan ◽  
Paul Lemaire
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Fibers ◽  
Reliability Assessment ◽  
Refractive Index Modulation ◽  
Thermal Decay ◽  
Fiber Gratings ◽  
Energy Diagram ◽  
Index Modulation ◽  
General Method

AbstractThe topic of reliability of UV-induced fiber gratings is reviewed. Approaches to assess and predict changes in optical properties of fiber gratings due to thermal decay of refractive index modulation are presented and compared. The mastercurve/demarcation energy diagram approach is shown to be a powerful and general method for the purpose. The process of thermal stabilization to obtain gratings with superior stability is delineated. It is shown that the mastercurve approach could be used to analyze other reliability problems such as in predicting hydrogen-induced losses in fibers.

scholarly journals Optical Properties of Materials for Solar Energy Based on Cadmium Chalcogenides Thin Films

2019 ◽  
Vol 20 (4) ◽  
pp. 367-371 ◽  
Author(s):  
R.Yu. Petrus ◽  
H.A. Ilchuk ◽  
A.I. Kashuba ◽  
I.V. Semkiv ◽  
E.O. Zmiiovska ◽  
...  
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
High Frequency ◽  
Optical Constants ◽  
Optical Parameter ◽  
Constant Density ◽  
Dispersion Energy ◽  
Cadmium Chalcogenides ◽  
Single Oscillator

The optical constants and thickness of cadmium chalcogenides (CdX, X= S, Se and Te) thin films prepared by quasi close-space sublimation and high-frequency magnetron sputtering method are determined. The optical constants and the band gap of the films under study have been determined. Optical properties (refractive index n(λ), extinction coefficient k(λ) and dielectric functions ε(λ)) of thin films and thickness d can be determined from the transmission spectrum. The dispersion of the refractive index was explained using a single oscillator model. Single oscillator energy and dispersion energy are obtained from fitting. The material optical parameter such as normalized integrated transmission, zero and high-frequency dielectric constant, density of state effective mass ratio was also calculated.

FP-LMTO study of structural, electronic, thermodynamic and optical properties of MgxCd1−x Se alloys

2014 ◽  
Vol 32 (4) ◽  
pp. 719-728 ◽  
Author(s):  
D. Bensaid ◽  
M. Ameri ◽  
M. El Hanani ◽  
Y. Azaz ◽  
D. Bendouma ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Density Functional ◽  
Molar Fraction ◽  
Dielectric Constants ◽  
Ternary Alloys ◽  
Wide Range ◽  
Direct Band ◽  
Extraordinary Refractive Index

AbstractStructural, electronic and optical properties of MgxCd1−x Se (0 ≤ x ≤ 1) are calculated for the first time using density functional theory. Our results show that these properties are strongly dependent on molar fraction of particular components — x. The bond between Cd and Se is partially covalent and the covalent nature of the bond decreases as the concentration of Mg increases from 0 % to 100 %. It is found that MgxCd1−x Se has a direct band gap in the entire range of x and the band gap of the alloy increases from 0.43 to 2.46 eV with the increase in Mg concentration. Frequency dependent dielectric constants ɛ1(ω), ɛ2(ω) refractive index n(ω) are also calculated and discussed in detail. The peak value of refractive indices shifts to higher energy regions with the increase in Mg. The larger value of the extraordinary refractive index confirms that the material is a positive birefringence crystal. The present comprehensive theoretical study of the optoelectronic properties of the material predicts that it can be effectively used in optoelectronic applications in the wide range of spectra: IR, visible and UV. In addition, we have also predicted the heat capacities (CV), the entropy (S), the internal energy (U) and the Helmholtz free energy (F) of MgxCd1−x Se ternary alloys.

Optical Properties of La3+ NPs/Ag+ Co-Doped Zinc Borotellurite Glass

2019 ◽  
Vol 290 ◽  
pp. 3-8
Author(s):  
M.F. Faznny ◽  
Mohamed Kamari Halimah ◽  
Amirah Abdul Latif ◽  
Farah Diana Muhammad ◽  
Laoding Hasnimulyati
Keyword(s):  
Optical Properties ◽  
Molar Fraction ◽  
Fundamental Absorption Edge ◽  
Xrd Analysis ◽  
Nonbridging Oxygen ◽  
X Ray Diffraction ◽  
Prepared Glass ◽  
Amorphous Nature ◽  
Increasing Trend ◽  
Co Doped

Lanthanum and silver co-doped zinc borotellurite glasses having chemical composition of [{[(TeO2)0.7(B2O3)0.3]0.7(ZnO)0.3}0.96 (La NPs)0.04]1-x(Ag2O)x with 0.02 ≤ x ≤ 0.10 molar fraction were fabricated via melt-quenching technique. X-ray diffraction (XRD) analysis confirmed the amorphous nature of the samples through the presence of broad hump instead of sharp peaks. Optical properties of the samples were determined through ultraviolet-visible spectroscopy (UV-Vis) in the range of 220 to 800 nm. Fundamental absorption edge observed in the optical absorption spectra shifts to longer wavelength as the concentration of silver in the glass system increases. Decreasing trend for indirect energy band gap and increasing trend of Urbach energy values with the increment of Ag content suggest the contribution of Ag to the formation of nonbridging oxygen. Enhanced optical properties of the prepared glass hints the possible application of the glass material as optical fiber in photonic field.

Modification of optical properties of PC-PBT/Cr2O3 and PC-PBT/CdS nanocomposites by gamma irradiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20402
Author(s):  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Color Difference ◽  
Band Gap Energy ◽  
Polybutylene Terephthalate ◽  
Γ Irradiation ◽  
Gap Energy ◽  
Vis Spectroscopy ◽  
Oxygen Atoms

Nanocomposite (NCP) films of polycarbonate-polybutylene terephthalate (PC-PBT) blend as a host material to Cr2O3 and CdS nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Samples from the PC-PBT/Cr2O3 and PC-PBT/CdS NCPs were irradiated using different doses (20–110 kGy) of γ radiation. The induced modifications in the optical properties of the γ irradiated NCPs have been studied as a function of γ dose using UV Vis spectroscopy and CIE color difference method. Optical dielectric loss and Tauc's model were used to estimate the optical band gaps of the NCP films and to identify the types of electronic transition. The value of optical band gap energy of PC-PBT/Cr2O3 NCP was reduced from 3.23 to 3.06 upon γ irradiation up to 110 kGy, while it decreased from 4.26 to 4.14 eV for PC-PBT/CdS NCP, indicating the growth of disordered phase in both NCPs. This was accompanied by a rise in the refractive index for both the PC-PBT/Cr2O3 and PC-PBT/CdS NCP films, leading to an enhancement in their isotropic nature. The Cr2O3 NPs were found to be more effective in changing the band gap energy and refractive index due to the presence of excess oxygen atoms that help with the oxygen atoms of the carbonyl group in increasing the chance of covalent bonds formation between the NPs and the PC-PBT blend. Moreover, the color intensity, ΔE has been computed; results show that both the two synthesized NCPs have a response to color alteration by γ irradiation, but the PC-PBT/Cr2O3 has a more response since the values of ΔE achieved a significant color difference >5 which is an acceptable match in commercial reproduction on printing presses. According to the resulting enhancement in the optical characteristics of the developed NCPs, they can be a suitable candidate as activate materials in optoelectronic devices, or shielding sheets for solar cells.

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