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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Boson Band Vibrations Aid Refractive Index Mapping of Waveguides in High Index Chalcogenide Glass
摘要： The boson band mapping of waveguides fabricated by femtosecond laser inscription was used for the first time to identify and understand the material densification profile in chalcogenide glasses. The refractive index mapping of waveguides in high refractive index dielectrics is problematic as there are no known techniques. Refracted near field technique cannot be carried out in glasses with refractive index higher than 1.6 due to the lack of availability or toxic nature of the index matching oil. Though other techniques based on holographic and phase microscopies are available, sample preparation steps compatible with reliable measurement are tedious and in some cases, like diamond, is almost impossible. In this work, using the information obtained from the Bosonic band vibrations, we explain waveguide formation in Gallium Lanthanum Sulphide (GLS) glass. The boson peak shows up in any amorphous material regardless of its constituents or stoichiometry and is observed in the low frequency region between 0 – 100 cm-1. Their origin is a well debated and controversial topic. Here we make use of its response to the physical properties of the material.
关键词： refractive index mapping,waveguides,boson band vibrations,chalcogenide glass,femtosecond laser inscription
更新于2025-09-11 14:15:04
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Dynamical processes related to viscous flow in a supercooled arsenic selenide glass-forming liquid: Results from high-temperature 77Se NMR spectroscopy
摘要： Dynamical processes in supercooled AsSe9 liquid are studied using 1D and 2D 77Se NMR spectroscopic techniques. The results demonstrate the coexistence of two distinct dynamical processes: one is a slow process related to the chemical exchange between the various Se environments by bond scission/renewal and the other is the fast Se chain segmental motion, which leads to the rapid averaging of the chemical shift anisotropy. The timescales of these two processes become increasingly similar as the glass transition is approached from above. The slow process is found to be closely coupled to viscosity over the entire temperature range of investigation and its activation energy is consistent with the Se-Se/As bond energies. On the other hand, the activation energy of the fast process is significantly higher, which may be indicative of its cooperative nature. This process becomes coupled to viscosity only in the immediate vicinity of the glass transition.
关键词： Supercooled liquid,Relaxation,Chalcogenide,Viscous flow,Glass transition,NMR spectroscopy
更新于2025-09-11 14:15:04
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[IEEE 2018 Photonics in Switching and Computing (PSC) - Limassol, Cyprus (2018.9.19-2018.9.21)] 2018 Photonics in Switching and Computing (PSC) - Experimental Demonstration of Surface-Normal MIM Modulator with Electro-Optic Polymer
摘要： We present an all-fiber Fabry-Perot filter that consists of chalcogenide fibers terminated with high-reflectivity coatings. The tunable filter has large free spectrum range over 300 nm and a finesse of 15.
关键词： tunable filter,chalcogenide fiber,mid-infrared
更新于2025-09-11 14:15:04
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Femtosecond laser-induced large area of periodic structures on chalcogenide glass via twice laser direct-writing scanning process
摘要： We presented a theoretical and experimental study for the evolution of femtosecond laser direct-writing induced large area of periodic surface structures on As2S3 glass. The laser direct-writing induced large area of low spatial frequency LIPSS (LSFL) structures can be fabricated with the overlap rate increases from 65% to 80%. The evolution process can be defined by the competition between the laser fluence and pulse overlap rate. What is more important is that, based on secondary femtosecond laser scanning process, the interaction between the initial LSFL structures induced by the first scanning and the laser pulse of the second scanning process can induce local field enhancement effect, which can directly split the surface periodic structures of LSFL. Such new sub-sequent high spatial frequency LIPSS (HSFL) fabrication process is quite different from the traditional multi-pulse induced HSFL and can be used to fabricate large-area HSFL structures.
关键词： Nano-fabrication,Femtosecond laser,LIPSS,Chalcogenide glasses
更新于2025-09-11 14:15:04
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Direct Laser Writing Using Chalcogenide Thin Films
摘要： Direct laser writing has been performed in thin AMTIR-1 layers. By using 10 ns laser pulses, 250 nm thick lines have been written by tightly focusing the laser beam on the thin film layers. The possibility to enhance this resolution by using the Sb2Te3 material as super-resolution mask is also discussed.
关键词： saturable absorption,direct laser writing,Z-scan,super-resolution,nonlinear optics,chalcogenide glasses
更新于2025-09-11 14:15:04
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Near-Infrared Lead Chalcogenide Quantum Dots: Synthesis and Applications in Light Emitting Diodes
摘要： This paper reviews recent progress in the synthesis of near-infrared (NIR) lead chalcogenide (PbX; PbX=PbS, PbSe, PbTe) quantum dots (QDs) and their applications in NIR QDs based light emitting diodes (NIR-QLEDs). It summarizes the strategies of how to synthesize high efficiency PbX QDs and how to realize high performance PbX based NIR-QLEDs.
关键词： lead chalcogenide,near-infrared,quantum dots,light emitting diodes
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Polarization Dependance Engineering of Chalcogenide Optical Fiber Couplers
摘要： Chalcogenide (ChG) glasses are well known as key materials for the fabrication of optical fiber components compatible with optical transmission in the mid-infrared. Recently, single-mode ChG optical fiber couplers (OFCs) have been proposed for broadband coupling as well as for wavelength multi/demultiplexing [1]. From silica fibers, it has been shown that a proper engineering of fused optical fiber couplers can lead to polarization beamsplitting [2]. Here, we explore the polarization properties of single-mode OFCs made out of ChG glass. We show that by an appropriate engineering of their aspect ratio, the polarization dependence of OFCs is adjusted from highly polarization dependent down to polarization independent.
关键词： mid-infrared,polarization dependence,aspect ratio,Chalcogenide glasses,optical fiber couplers
更新于2025-09-11 14:15:04
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Synthesis and Characterization of Three-coordinated Tin(II) Chalcogenide Compounds from Chlorostannylene Supported by β-diketiminato Ligand
摘要： The stable chlorostannylene(II) LSnCl 1 reacted with bases or salts (KOH, t-BuOK, Ph3CSLi or Li2S), respectively, which led to the formation of a variety three-coordinated tin(II) chalcogens (O or S) (compounds 2-5). Compounds 2 and 5 are bridged bimetallic organotins(II) supported by a bidentate β-diketiminato ligand. Furthermore, the catalytic activity of compounds 2-5 for hydroboration with benzaldehyde and acetophenone was investigated, respectively. In the X-ray analyses of all stannylene chalcogenide compounds, the pyramidalization on the tin center are useful to enhanced p-character of lone pair. All compounds were characterized by 1H NMR and 13C NMR spectroscopy, single crystal X-ray structural analysis and elemental analysis.
关键词： Bimetallic organotins,Chlorostannylene(II),Chalcogenide bridging,Three-coordinated Tin(II),β-diketiminato ligands
更新于2025-09-10 09:29:36
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All-optical notch filters for ultra-wideband chaotic communications
摘要： In this paper, a wideband all-optical notch ?lter is proposed using two cascaded modi?ed add-drop resonators from chalcogenide glass (ChG) and GaAsInP-InP waveguide materials. The system consists of ChG main ring and two small side rings called phase modulators made of the GaAsInP-InP materials. The plane waves are fed at the input and add ports, from which the chaotic signal outputs can be generated by the nonlinear e?ect induced into the center ring. The results have been simulated based on the scattering matrix method. Results have shown that the generated chaotic signals can be used for switching and secured communications. An ultra-fast switching time of ～ 2 attoseconds is achieved. Moreover, the chaotic signals can be ?ltered by the stop band ?lters (notch ?lters). The free spectral range (FSR) of two cascaded ChGs is 1494.8 nm. The output wavelength of the notch ?lters is tunable from 748.0–2242.2 nm and 2242.8–3737.0 nm. The band-stop of the notch ?lter is 1494.2 nm. This approach will allow the implementation of the compact, and integrated notch ?lters in an on-chip scale circuit, which is useful for both light ?delity (LiFi) and wireless ?delity (WiFi) applications.
关键词： WiFi,all-optical notch ?lters,chalcogenide glass,GaAsInP-InP,scattering matrix method,ultra-wideband chaotic communications,LiFi
更新于2025-09-10 09:29:36
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Evaluation of sensitivity of Ge9As9Se82 and Ge16As24Se60 thin films to irradiation with electron beam
摘要： The interaction of Ge9As9Se82 and Ge16As24Se60 amorphous chalcogenide thin films with electron beam has been investigated. The kinetics of surface relief formation was determined for both film compositions. It was established that for identical electron beam irradiation parameters, the kinetics of relief formation can be correlated with charge accumulation rate, its final value inside films and charge diffusion away from the electron interaction region. Charge model has been used to explain various phenomena during electron beam interaction with studied systems and parameters of this model are determined. Application of studied systems in single stage electron beam lithography is also presented.
关键词： Surface potential,Electron beam irradiation,Chalcogenide thin films,Ge-As-Se
更新于2025-09-10 09:29:36