MODIFIED ABSORPTION FEATURES OF TITANIA-ERBIUM INCORPORATED PLASMONIC TELLURITE GLASS SYSTEM

2015 ◽  
Vol 76 (13) ◽  
Author(s):  
Nur Nabihah Yusof ◽  
Sib Krishna Ghoshal ◽  
Ramli Ariffin ◽  
Mohd Rahim Sahar
Keyword(s):  
Electric Field ◽  
Tellurite Glass ◽  
Strong Electric Field ◽  
Emission Cross Section ◽  
Glass Network ◽  
Concentration Quenching ◽  
Glass System ◽  
Suitable Alternative ◽  
Tio2 Nps ◽  
Enhanced Absorption

Achieving efficient lasing glass materials with enhanced absorption and emission cross-section by reducing the Rare Earth (RE) concentration quenching is a challenging issue. Metal nanoparticles (NPs) together with RE ions in the glass matrix are thought as a suitable alternative to overcome the limitations of concentration quenching and weak absorption of inorganic glasses. We prepare a series of Titania-Erbium doped Tellurite glass system with the form (69-x)TeO2-20ZnO-10Na2O-1Er2O3-(x)TiO2, where  0 ≤ x≤ 1.0 mol% via melt-quenching method with optimum erbium contents and varying TiO2 NPs concentrations. The NPs concentration dependent modifications in the absorption characteristics are scrutinized. Glasses are characterized via UV-Vis-NIR and XRD measurements. XRD pattern verifies the amorphous nature of prepared samples. The incorporation of TiO2 NPs is demonstrated to enhance the absorption intensity significantly. This augmentation is attributed to the effect of Surface Plasmon Resonance (SPR) mediated strong local electric field that is swallowed by neighboring Er3+ ions. The observed modification in optical energy band gap and Urbach energy are ascribed to the strong electric field around NPs that interact with the ligand of glass network to transform weak bond into defects. This observation is useful for the development of plasmonic nanoglass materials applicable for photonic devices.

Absorption and Raman Spectra of Dy3+ Doped Tellurite Glass: Combined Effects of Silver and Titanium Nanoparticles

2017 ◽  
Vol 268 ◽  
pp. 111-116
Author(s):  
Mohd Syamsul Affendy bin Mohd Saidi ◽  
Sib Krishna Ghoshal ◽  
Ramli Arifin ◽  
Mohamad Khairil bin Roslan
Keyword(s):  
Electric Field ◽  
Raman Spectra ◽  
Tellurite Glass ◽  
Rare Earth Ions ◽  
Glass System ◽  
Noble Metal Nanoparticles ◽  
Spectroscopic Techniques ◽  
Combined Effects ◽  
Absorption Bands ◽  
Absorption Properties

Obtaining enhanced up-conversion efficiency in rare earth ions doped inorganic glass by means of noble metal nanoparticles (NPs) embedment remains challenging. For the first time, we report the combined effects of silver (Ag) and titania (TiO2) NPs embedment on the structural and absorption characteristics of dysprosium (Dy3+) doped tellurite glass. Transparent and thermally stable glass samples were prepared using conventional melt quenching method and characterized via spectroscopic techniques. The production of the strong electric field in the proximity of Dy3+ ion due to the localized surface plasmon (LSP) of embedded metallic NPs was found to improve the glass absorption properties. The effects of bimetallic NPs in changing the structure and absorption properties were found to be better than singly included metallic NP (either Ag or TiO2). This improvement in the absorption behavior was attributed to the combined LSP resonance (LSPR) effects of Ag and TiO2 NPs which transferred strong local electric field into the Dy3+ ions positioned in their vicinity. The UV-Vis-NIR spectra revealed six absorption bands centerted at 1690, 1283, 1097, 904, 800 and 755 nm which were allocated to the transition from 6H15/2 ground state to various excited states (6H11/2, 6F11/2, 6F9/2, 6F7/2, 6F5/2 and 6F3/2) of Dy3+ ion. Furthermore, the Raman spectra of such bimetallic NPs included glass system exhibited Raman peak shift accompanied by intensity variations when compared to the glass system with only one type of NPs incorporation. This enhancement in the Raman signal was ascribed to the LSPR mediated mechansim. The synthesized glass comporition was asserted to be prospective for devices.

scholarly journals Effect of Neodymium Nanoparticles on Elastic Properties of Zinc-Tellurite Glass System

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Abdulbaset A. Abdulla Awshah ◽  
Halimah Mohamed Kamari ◽  
Chan Kar Tim ◽  
Nurisya Mohd Shah ◽  
S. H. Alazoumi ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Tellurite Glass ◽  
Glass Network ◽  
Softening Temperature ◽  
Xrd Analysis ◽  
Glass System ◽  
Amorphous Nature ◽  
Nanoparticles Concentration ◽  
Quenching Method ◽  
The Impact

The aim of this work is to determine the effect of neodymium nanoparticles concentration on the elastic properties of zinc-tellurite glass. A series of neodymium nanoparticles doped zinc-tellurite glass systems (NdNPsZT) of composition [(TeO2)0.70(ZnO)0.30]1-x(Nd2O3 NPs)(x), x=0.01, 0.02, 0.03, 0.04, and 0.05, were synthesized by using conventional melt-quenching method. The amorphous nature of the glass system was confirmed by using XRD analysis. The density of the glass system was determined by Archimedes method. The elastic properties were calculated from the measured density and ultrasonic velocity at 5 MHz frequency. The experimental results showed that the elastic properties rely upon the composition of the glass systems and the impact of neodymium nanoparticles (Nd2O3 NPs) within the glass network. The increase in ultrasonic velocities is due to the increase in rigidity and change in structural units of the glass system. The softening temperature and the microhardness increased with the increase in Nd3+ ions concentration from 0.1 to 0.2 mol and decreased when the Nd3+ ions concentration increased from 0.2 to 0.5 mol. Poisson’s ratio and Debye’s temperature decreased with the increase in the Nd3+ ions concentration from 0.1 to 0.2 mol and increased when the Nd3+ ions concentration was increased from 0.2 to 0.5 mol.

Effect of Neodymium Ions on Density and Elastic Properties of Zinc Tellurite Glass Systems

2017 ◽  
Vol 268 ◽  
pp. 28-32 ◽  
Author(s):  
A.A. Abdulbaset ◽  
Mohamed Kamari Halimah ◽  
M.N. Azlan
Keyword(s):  
Elastic Properties ◽  
Tellurite Glass ◽  
Glass Network ◽  
Shear Velocity ◽  
Xrd Analysis ◽  
Glass System ◽  
Ion Concentration ◽  
Waveguide Lasers ◽  
Neodymium Concentration ◽  
Quenching Method

The aim of this work is to determine the effect of Nd3+ ion concentration on the elastic properties of zinc-tellurite glass for the development of waveguide lasers. A series of Neodymium doped zinc-tellurite (NZT) glass system of composition [(TeO2) 0.70 (ZnO) 0.30] (1-x) Nd2O3 (x), x =0, 0.01, 0.02, 0.03, 0.04 and 0.05, were synthesized by using conventional melt-quenching method. XRD analysis confirmed the amorphous nature of the glass; the FTIR confirmed the presence of TeO3 and TeO4 in the glass network. The density of the glass system increases with increase in neodymium concentration. The longitudinal ultrasonic velocity decreases from 3737.01 to 3045.23 ± 10 ms−1, and the shear velocity decreases from 1959.31 to 1887.81 ± 10 ms−1. The experimental results have shown that the elastic properties depend on the composition of the glass systems and the effect of neodymium (Nd2O3) within the glass network.

scholarly journals Axion assisted Schwinger effect

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Valerie Domcke ◽  
Yohei Ema ◽  
Kyohei Mukaida
Keyword(s):  
Electric Field ◽  
Production Rate ◽  
Strong Electric Field ◽  
Background Field ◽  
Chiral Anomaly ◽  
Fermion Mass ◽  
Anomaly Equation ◽  
Electric And Magnetic Fields ◽  
Schwinger Effect ◽  
Momentum Transverse

Abstract We point out an enhancement of the pair production rate of charged fermions in a strong electric field in the presence of time dependent classical axion-like background field, which we call axion assisted Schwinger effect. While the standard Schwinger production rate is proportional to $$ \exp \left(-\pi \left({m}^2+{p}_T^2\right)/E\right) $$ exp − π m 2 + p T 2 / E , with m and pT denoting the fermion mass and its momentum transverse to the electric field E, the axion assisted Schwinger effect can be enhanced at large momenta to exp(−πm2/E). The origin of this enhancement is a coupling between the fermion spin and its momentum, induced by the axion velocity. As a non-trivial validation of our result, we show its invariance under field redefinitions associated with a chiral rotation and successfully reproduce the chiral anomaly equation in the presence of helical electric and magnetic fields. We comment on implications of this result for axion cosmology, focussing on axion inflation and axion dark matter detection.

Effects of additives on the thermal stability of silver tellurite glass system

2022 ◽  
Vol 165 ◽  
pp. 108683
Author(s):  
Hyun Woo Kang ◽  
Jung-Hoon Choi ◽  
Ki Rak Lee ◽  
Hwan-Seo Park
Keyword(s):  
Thermal Stability ◽  
Tellurite Glass ◽  
Glass System ◽  
Thermal Stability Of

Observation of the Avalanche of Runaway Electrons in Air in a Strong Electric Field

2012 ◽  
Vol 109 (8) ◽  
Author(s):  
A. V. Gurevich ◽  
G. A. Mesyats ◽  
K. P. Zybin ◽  
M. I. Yalandin ◽  
A. G. Reutova ◽  
...  
Keyword(s):  
Electric Field ◽  
Strong Electric Field ◽  
Runaway Electrons
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