Study of vibrational spectroscopy, linear and nonlinear optical properties of borate-modified tellurium–silica–bismuthate glasses

Role of SiO2 in tailoring stability and nonlinear optical behaviour of gold nanoparticles in glass

“…All the glass samples show similar bands with subtle changes after the incorporation of AuNPs. Three bands centred at 420 cm −1 , 490 cm −1 and 570 cm −1 in the region 400-600 cm −1 appear due to stretching vibrations Bi-O-Bi linkage in BiO 6 units whereas the appearance of a strong band centred at 452 cm −1 in the same region can be attributed to the combination of Bi-O vibrations in BiO 6 and Si-O-Si bending vibration in SiO 4 tetrahedral units [34,38,39]. Another strong band centred at 694 cm −1 is assigned to bending vibrations of the B-O-B units borate network [40,41].…”

Effect of Graphene Additives on the Structure and Optical Parameters of Pure Sodium Borate Glass

“…To estimate the exact bandage Em which is required to obtain the mention optoelectronic parameters, the values of the direct bandgap E direct have been used to fit the measured absorption coefficient by the hydrogenic excitonic model (HEM) [35]. This model was suggested by Elliott et al [35][36] to describe the variation of the optical absorption coefficient (a cm-1) versus the photon energy according to the following relations (4-7), where C0, and R are the absorption strength and excitonic binding energy, respectively. While Γ1, and Γc are the linewidth of m=1 state and the linewidth of the continuum state, respectively.…”