Chalcogenide glasses: a review of their preparation, properties and applications

Seddon, Angela B.

doi:10.1016/0022-3093(94)00686-5

Cited by 416 publications

(175 citation statements)

References 34 publications

Supporting

Mentioning

171

Contrasting

Unclassified

Order By: Relevance

“…As could be seen, the addition of Ga 2 Se 3 resulted in higher characteristic temperatures when compared with other conventional chalcogenide glasses [13]. A change in Tg as low as 46°C was registered between samples with low and high content of selenium (20 and 70 mol% Ga 2 Se 3 ).…”

Section: Resultsmentioning

confidence: 71%

Ga-La-S-Se glass for visible and thermal imaging

Ravagli

Craig

Lincoln

et al. 2017

Advanced Optical Technologies

View full text Add to dashboard Cite

Chalcogenide glasses are emerging as important enabling materials for low-cost infrared imaging by virtue of their transparency in the key short-wave infrared (SWIR) to long-wave infrared (LWIR) bands and the ability to be mass produced and molded into near-net shape lenses. In this paper, we introduce a new family of chalcogenide glasses, which offer visible as well as infrared transmission and improved thermal and mechanical properties. These glasses are based on Ga 2 S 3 -La 2 S 3 with added Ga 2 Se 3 -up to complete the substitution of Ga 2 S 3 for Ga 2 Se 3 . The samples are prepared via the melt-quench method in an argon-purged atmosphere. All the studied compositions showed a lower glass transition temperature and an extended transmission window. Particularly, the LWIR transmission was extended from about 9 μm for gallium lanthanum sulfide (Ga-La-S) glass to about 15 μm for Se-added Ga-La-S retaining visible transmission from around 463 nm. The thermal and mechanical properties were investigated to prove the suitability of these novel materials for the production of optical components such as visible to LWIR lenses. Their suitability for drawing into optical fibers is also discussed.

show abstract

Section: Resultsmentioning

confidence: 71%

Ga-La-S-Se glass for visible and thermal imaging

Ravagli

Craig

Lincoln

et al. 2017

Advanced Optical Technologies

View full text Add to dashboard Cite

show abstract

“…The As-Te glasses have been studied for various applications based on their promising properties [1][2][3][4][5][6]. The effect of thermal annealing on the optical properties of chalcogenide glasses has been studied and interpreted according to the density of states model in amorphous materials proposed by Mott et al [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of annealing temperature on the structural and optical properties of As₃₀Te₇₀ thin films

Abd‐Elnaiem

Mohamed

Hassan

et al. 2017

Materials Science-Poland

View full text Add to dashboard Cite

Chalcogenide glasses have attracted much attention largely due to their interesting physical and chemical properties. Though few published articles exist on the As-Te system, little is known about the optical properties of eutectic or near eutectic composition of As-Te system upon heat treatment. Therefore, this paper reports the effects of annealing temperature on the structural and optical parameters of As 30 Te 70 thin films. The bulk and thin films of 150 nm thick As 30 Te 70 chalcogenide glasses were prepared by melt-quenching and thermal evaporation techniques, respectively. The glass transition and crystallization reactions of the bulk samples were investigated using differential scanning calorimetry (DSC). The influence of annealing temperature on the transformation of the crystal structure was studied by X-ray diffraction (XRD), while the surface morphology of the annealed samples was examined using scanning electron microscope (SEM). The optical band gap, refractive index and extinction coefficient were also calculated. The DSC scans showed that the melting temperature remains constant at 636.56 K. In addition, other characteristic temperatures such as the glass transition temperature, the onset crystallization temperature, and the crystallization peak temperature increase with increasing the heating rate. The crystalline phases for the as-prepared and annealed films consist of orthorhombic As, hexagonal Te, and monoclinic As 2 Te 3 phases. Furthermore, the average crystallite size, strain, and dislocation density depend on the annealing temperature. The optical absorption results revealed that the investigated films have a direct transition, and their optical energy gap decreases from 1.82 eV to 1.49 eV as the annealing temperature increases up to 433 K. However, the refractive index, extinction coefficient, dielectric constant and the ratio of free carrier concentration to its effective mass, increase with increasing the annealing temperature.

show abstract

“…9,10 Apart from this, ChG also exhibits unique light-induced effects of fundamental interest like photoexpansion, 11 photofluidity, 12 which makes them versatile platforms for optoelectronics, waveguide writing, patterning, and nanofabrication. [13][14][15] In ChG, Kolomiets et al 16 and Matsuda et al 17 have demonstrated the transient change in photocurrent. Notably, Yumasheve et al showed that these light-induced effects can be attributed to the excitation of electron-hole pairs and thereby enhancing the concentration of localized trap states in the gap.…”

mentioning

confidence: 99%

Ultrafast defect dynamics: A new approach to all optical broadband switching employing amorphous selenium thin films

et al. 2015

View full text Add to dashboard Cite

Optical switches offer higher switching speeds than electronics, however, in most cases utilizing the interband transitions of the active medium for switching. As a result, the signal suffers heavy losses. In this article, we demonstrate a simple and yet efficient ultrafast broadband all-optical switching on ps timescale in the sub-bandgap region of the a-Se thin film, where the intrinsic absorption is very weak. The optical switching is attributed to short-lived transient defects that form localized states in the bandgap and possess a large electron-phonon coupling. We model these processes through first principles simulation that are in agreement with the experiments.

show abstract

Chalcogenide glasses: a review of their preparation, properties and applications

Cited by 416 publications

References 34 publications

Ga-La-S-Se glass for visible and thermal imaging

Ga-La-S-Se glass for visible and thermal imaging

Influence of annealing temperature on the structural and optical properties of As₃₀Te₇₀ thin films

Ultrafast defect dynamics: A new approach to all optical broadband switching employing amorphous selenium thin films

Contact Info

Product

Resources

About

Chalcogenide glasses: a review of their preparation, properties and applications

Cited by 416 publications

References 34 publications

Ga-La-S-Se glass for visible and thermal imaging

Ga-La-S-Se glass for visible and thermal imaging

Influence of annealing temperature on the structural and optical properties of As30Te70 thin films

Ultrafast defect dynamics: A new approach to all optical broadband switching employing amorphous selenium thin films

Contact Info

Product

Resources

About

Influence of annealing temperature on the structural and optical properties of As₃₀Te₇₀ thin films