194 research outputs found
Multimaterial disc-to-fiber approach to efficiently produce robust infrared fibers
A critical challenge in the fabrication of chalcogenide-glass infrared optical fibers is the need for first producing large volumes of high-purity glass-a formidable task, particularly in the case of multicomponent glasses. We describe here a procedure based on multimaterial coextrusion of a hybrid glass-polymer preform from which extended lengths of robust infrared fibers are readily drawn. Only similar to 2 g of glass is required to produce 46 m of step-index fiber with core diameters in the range 10-18 mu m. This process enables rapid prototyping of a variety of glasses for applications in the delivery of quantum cascade laser light, spectroscopy, sensing, and astronomy
The feasibility of Sn, In, or Al doped ZnSb thin film as candidates for phase change material
The potentials of Sn, In, or Al doped ZnSb thin film as candidates for phase change materials have been studied in this paper. It was found that the Zn-Sb bonds were broken by the addition of the dopants and homopolar Zn-Zn bonds and other heteropolar bonds, such as Sn-Sb, In-Sb, and Al-Sb, were subsequently formed. The existence of homopolar Sn-Sn and In-In bonds in
Znâ
âSbââSnââ and ZnââSbââInââ films, but no any Al-Al bonds in Znââ
SbââAlââ
film, was confirmed. All these three amorphous films crystallize with the appearance of crystalline rhombohedral Sb phase, and Znââ
Sbââ
Alââ
film even exhibits a second crystallization process where the crystalline AlSb phase is separated out. The Znââ
SbââAlââ
film exhibits a reversible phase change behavior with a larger Ea ( 4.7 eV), higher Tc (~ 245ᎌ C), better 10-yr data retention (~ 182ᎌ C), less incubation time (20 ns at 70 mW), and faster complete crystallization speed (45 ns at 70 mW). Moreover,
Znââ
SbââAlââ
film shows the smaller root-mean-square (1.654 nm) and less change of the thickness between amorphous and crystalline state (7.5%), which are in favor of improving the reliability of phase change memory.This work was financially supported by the Natural
Science Foundation of China (Grant Nos. 61306147,
61377061), the Public Project of Zhejiang Province (Grant
No.2014C31146), the Young Leaders of academic climbing
project of the Education Department of Zhejiang Province
(pd2013092), the Natural Science Foundation of Zhejiang
Province (Grant No. LQ15F040002), the Scientific Research
Foundation of Graduate School of Ningbo University, and sponsored by K. C. Wong Magna Fund in Ningbo
University
Formation and properties of chalcogenide glasses based on GeS2-âSb2S3-âAgI system
International audienceNovel glasses in GeS2-âSb2S3-âAgI system have been prepd. by melt-âquenching method. A large glass-âforming region was found in this novel system, in which almost 60 molâ% AgI has been incorporated. The basic physiochem. properties of glass samples were investigated. With the addn. of AgI, red shift of short-âwavelength absorption edge and distinct drop of the glass transition temp. (Tg) were obsd. In addn., a high Ag+ ion cond. of 6.37Ă10-â4 Sâ/cm at room temp. was obtained in 55(0.6GeS2-â0.4Sb2S3)â-â45AgI sample, indicating that these glasses have potential application as amorphous solid electrolytes
Glass formation and properties of Ge-Ga-Te-ZnI2 far infrared chalcohalide glasses
International audienceIn order to develop novel far infrared window material, a series of Ge-Ga-Te-ZnI2 chalcohalide glasses were prepared by traditional melt-quenching method and their glass-forming region was determined also. Here, some measurements including X-ray diffraction (XRD), differential thermal analysis (DTA), UV-Vis-NIR absorption spectrum, and infrared optical transmission spectra were carried out. The allowed indirect transition optical band gap was calculated according to the classical Tauc equation. The results show that with the addition of ZnI2, the glass-forming ability and thermal stability are improved gradually. With the contents of ZnI2 increased from 5 to 20 at.%, continued blue-shifting occurs in the cutting-off absorption edge of short-wavelength and the values of indirect optical band gaps were observed with ranges from 0.596 to 0.626 eV in these glasses. These GeTe4.3-GaTe3-ZnI2 glasses show wide optical transmission and the infrared cut-off wavelengths are larger than 25 ÎŒm, which implies that the Ge-Ga-Te-ZnI2 chalcogenide glasses possess the potential of far-IR optical window applications
Enhanced thermal stability and electrical behavior of Zn-doped Sb2Te films for phase change memory application
Zn-doped SbâTe films are proposed to present the feasibility for phase-change memory application. Zn atoms are found to significantly increase crystallization temperature of Zn x (SbâTe)1âx films and be almost linearly with the wide range of Zn-doping concentration from xâ=â0 to 29.67 at.%. Crystalline resistances are enhanced by Zn-doping, while keeping the large amorphous/crystalline resistance ratio almost constant at âŒ10â”. Especially, the Zn 26.07 (SbâTe)73.93 and Zn 29.67 (SbâTe)70.33 films exhibit a larger resistance change, faster crystallization speed, and better thermal stability due to the formation of amorphous Zn-Sb and Zn-Te phases as well as uniform distribution of SbâTe crystalline grains
Phase change behaviors of Zn-doped Ge2Sb2Te5 films
This work was financially supported by the Program for
New Century Excellent Talents in University (Grant No.
NCET-10-0976), the International Science & Technology
Cooperation Program of China (Grant No. 2011DFA12040),
the National Program on Key Basic Research Project (973
Program) (Grant No. 2012CB722703), the Natural Science
Foundation of China (Grant Nos. 61008041 and 60978058),
the Natural Science Foundation of Zhejiang Province, China
(Grant No. Y1090996), the Natural Science Foundation of
Ningbo City, China (Grant No. 2011A610092), the Program
for Innovative Research Team of Ningbo city (Grant No.
2009B21007), and sponsored by K. C. Wong Magna Fund in
Ningbo University
Third-order nonlinearity in GeâSbâSe glasses at mid-infrared wavelengths
International audienceThe optical properties of GeâSbâSe glasses have been extensively studied at telecom wavelengths in recent years. However, the understanding of nonlinearity in GeâSbâSe glasses at mid-infrared wavelengths still remains limited. In this work, a series of Ge20SbxSe80âx (x = 0, 5, 10) glasses were prepared by conventional meltâquenching method. The absorption spectra and the refractive index of glasses were recorded. The third order nonlinearity, n2, and nonlinear absorption coefficient were measured for GeâSbâSe glass samples at the wavelengths of 1550, 2000 and 2500 nm by Z-scan technique, respectively. With the increasing of Sb contents, the linear refractive index of glass increased. Among the three operating wavelengths, all the three glass samples have a highest n2 at 2000 nm. By using the figure of merit (FOM) to evaluate the studied three glasses, the Ge20Sb10Se70 glass shows the greatest potential for mid-IR all optical switching device
Preparation of Low-loss Ge15Ga10Te75 chalcogenide glass for far-IR optics applications
International audienceGe15Ga10Te75 (GGT) glass shows good transparency between 2 and 25Â ÎŒm wavelengths, good chemical and thermal stability to be drawn into fiber, which appears to be a good candidate for developing far-IR fiber-optics devices, although there are strong absorption peaks caused by impurities in the glass. With the aim of decreasing the content of impurities and micro-crystal particles in prepared \GGT\ glass samples, a rapid heating furnace and the fast distillation method based on vapor evaporation plus deposition under vacuum condition was adopted. Properties measurements including Differential Scanning Calorimeter (DSC), Vis-NIR and \IR\ transmitting spectra were performed on the prepared glass samples. Dependence of optical loss on the types of oxygenic getters and their contents and glass quenching temperature was also studied. All these results show that the average optical losses of distilled glass samples were greatly improved by the designated purification processes. Besides, the quality of the glass samples can be improved with the optimized quenching temperature. In all, the optical loss of the glass can be reduced effectively. Minimum optical losses of 0.042Â dB/mm at 9Â ÎŒm and 0.037Â dB/mm at 12Â ÎŒm are obtained after a right purification process, which are the lowest loss of the \GGT\ chalcogenide glass nowadays
Improved phase-change characteristics of Zn-doped amorphous SbâTeâ films for high-speed and low-power phase change memory
The superior performance of Zn-doped SbâTeâ films might be favorable for the application in phase change memory. It was found that Zn dopants were able to suppress phase separation and form single stable Sb2Te crystal grain, diminish the grain size, and enhance the amorphous thermal stability of SbâTeâ film. Especially, Zn 30.19(SbâTeâ)69.81 film has higher crystallization temperature (âŒ258â°C), larger crystallization activation energy (âŒ4.15âeV), better data retention (âŒ170.6â°C for 10âyr), wider band gap (âŒ0.73âeV), and higher crystalline resistance. The minimum times for crystallization of Zn 30.19(SbâTeâ)69.81 were revealed to be as short as âŒ10âns at a given proper laser power of 70âmW.This work was financially supported by the International
Science & Technology Cooperation Program of China
(Grant No. 2011DFA12040), the National Program on Key
Basic Research Project (973 Program) (Grant No.
2012CB722703), the Natural Science Foundation of China
(Grant Nos. 61008041 and 60978058), the CAS Special
Grant for Postgraduate Research, Innovation and Practice,
the Program for Innovative Research Team of Ningbo city
(Grant No. 2009B21007), and sponsored by K. C. Wong
Magna Fund in Ningbo University
Freely adjusted properties in GeâS based chalcogenide glasses with iodine incorporation
International audienceIn this study, we examined the function of halogen iodine acting as a glass network modifier in green chalcogenide glasses based on the GeâS system. We obtained a series of GeâSâI glasses and determined their glass-forming region. We then recorded the physical, thermal, and optical properties and studied the effect of halogen iodine on GeâSâI glasses. Results show that these glasses have relatively wide optical transmission window for infrared (IR) applications. The softening temperature of GeâSâI glasses varies from 210.54 °C to 321.63 °C, this temperature fits well with some kinds of high-temperature polymers, such as PES and PEI, the polymers serve as protective layers with high strength and flexibility, thus simplifying the fabrication processes of IR chalcogenide glass fiber. Finally, we performed a purification process to eliminate impurities and to improve optical spectr
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