The Development of Advanced Optical Fibers for Long-Wave Infrared Transmission

Lucas, Pierre; Boussard‐Plédel, Catherine; Wilhelm, Allison A.; Zhang, Xianghua; Houizot, Patrick; Maurugeon, Sébastien; Conseil, Clément; Bureau, Bruno

doi:10.3390/fib1030110

Cited by 17 publications

(7 citation statements)

References 33 publications

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“…range compared to the Ge-Se case. Focusing on compositions close to GeTe 4 , the inclusion of small amounts of Se, Ga or I was found to contribute to improved glass formation and stability against crystallization, thereby meeting the requirements of enhanced stability combined to exceptionally broad (up to 28 µm) IR windows[1,2,3]. It has to be reminded that, although somewhat similar in terms of the chemical compositions, this family of glasses is distinct from the phase change materials (PCM) glasses, for which the occurrence of…”

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confidence: 99%

First-principles study of the atomic structure of glassy Ga10Ge15Te75

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Ori

Boero

et al. 2018

Journal of Non-Crystalline Solids

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First-principles molecular dynamics have been employed to highlight the structural properties of glassy Ga 10 Ge 15 Te 75 (GGT), a promising disordered system for infrared applications. Our approach relies entirely on the predictive power of density functional theory, in combination with a careful choice of the exchangecorrelation functional and the account of van der Waals interactions. Glassy GGT can be viewed as a predominantly tetrahedral network, both with respect to Ge and Ga atoms. Te atoms are mostly twofold coordinated to all combinations of pairs of Ge, Ga or Te atoms. We find little evidence of intermediate range order in the partial structure factors.

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confidence: 99%

First-principles study of the atomic structure of glassy Ga10Ge15Te75

Chaker

Ori

Boero

et al. 2018

Journal of Non-Crystalline Solids

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“…Indeed, in this glass series, the compositions from TG-AgI10 to TG-AgI20 do not show any crystallization peak by thermal analysis, meaning that the simultaneous introduction of Ag and I in GeTe 4 -based glass plays a beneficial role on the glass thermal stability [2,46]. In addition, as a low band-gap amorphous semiconductor, the attenuation of Te-based glass fiber is shown to strongly depend on extrinsic impurity but also on intrinsic charge carrier populations [48]. Thus, a low free electron rate in (GeTe 4 ) 100-x (AgI) x glasses is beneficial to decrease fiber optical losses.…”

Section: Discussionmentioning

confidence: 82%

Electrical and optical investigations in Te–Ge–Ag and Te–Ge–AgI chalcogenide glasses

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Boussard‐Plédel

et al. 2015

Journal of Alloys and Compounds

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International audience(GeTe4)100-xAgx and (GeTe4)100-x(AgI)x glasses were prepd. by a melting-quenching method. The glass elec. cond. was investigated by both electrochem. impedance spectroscopy at different temps. from 283 K to 333 K and four-probe method at room temp. (293 K). Meanwhile, as a major factor detg. the elec. cond. of a solid, optical band gap was also studied. By comparing the elec. cond. values and glass optical band gap evolution, it was found that (GeTe4)100-xAgx glasses are mainly electronic conductive. On the other hand, the elec. conductivities of (GeTe4)100-x(AgI)x glasses firstly show a monotonic decrease by increasing AgI up to 15 mol.%, and then an increase when the AgI content is higher than 15 mol.%. The activation energy Ea and the pre-exponential factor σ0 show apparent turning point when AgI content is 15 mol.%, signifying a cond. mechanism change. In this paper, correlations between the cond. and hypothetical structures in (GeTe4)100-xAgx and (GeTe4)100-x(AgI)x glasses are done and the importance of the Ag role is underlined

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“…5 indicates that sulfide and selenide glass fibers may be inadequate for many far-infrared applications. In this case, glasses containing tellurium are required to achieve wide IR transparency [23,[29][30][31][32][33][34]. One of the main challenges for the fabrication of long wave infrared fibers is to obtain a glass with a high tellurium content which does not crystallize during the fiber drawing process [34] and does not exhibit high charge carrier losses [23].…”

Section: Tailoring the Optical Window Of Chalcogenide Glass Fibersmentioning

confidence: 99%

Chalcogenide glass fibers: Optical window tailoring and suitability for bio-chemical sensing

et al. 2015

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a b s t r a c tGlassy materials based on chalcogen elements are becoming increasingly prominent in the development of advanced infrared sensors. In particular, infrared fibers constitute a desirable sensing platform due to their high sensitivity and versatile remote collection capabilities for in-situ detection. Tailoring the transparency window of an optical material to the vibrational signature of a target molecule is important for the design of infrared sensor, and particularly for fiber evanescent wave spectroscopy. Here we review the basic principles and recent developments in the fabrication of chalcogenide glass infrared fibers for application as bio-chemical sensors. We emphasize the challenges in designing materials that combine good rheological properties with chemical stability and sufficiently wide optical windows for bio-chemical sensing. The limitation in optical transparency due to higher order overtones of the amorphous network vibrations is established for this family of glasses. It is shown that glasses with wide optical window suffer from higher order overtone absorptions. Compositional engineering with heavy elements such as iodine is shown to widen the optical window but at the cost of lower chemical stability. The optical attenuations of various families of chalcogenide glass fibers are presented and weighed for their applications as chemical sensors. It is then shown that long-wave infrared fibers can be designed to optimize the collection of selective signal from bio-molecules such as cells and tissues. Issues of toxicity and mechanical resistance in the context of bio-sensing are also discussed.

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The Development of Advanced Optical Fibers for Long-Wave Infrared Transmission

Cited by 17 publications

References 33 publications

First-principles study of the atomic structure of glassy Ga10Ge15Te75

First-principles study of the atomic structure of glassy Ga10Ge15Te75

Electrical and optical investigations in Te–Ge–Ag and Te–Ge–AgI chalcogenide glasses

Chalcogenide glass fibers: Optical window tailoring and suitability for bio-chemical sensing

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