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Linear and nonlinear optical properties of Sb-doped GeSe_2 thin films
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作者 张振营 陈芬 +4 位作者 陆顺斌 王永辉 沈祥 戴世勋 聂秋华 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第6期483-487,共5页
Sb-doped GeSe2 chalcogenide thin films are prepared by the magnetron co-sputtering method. The linear optical properties of as-deposited films are derived by analyzing transmission spectra. The refractive index rises ... Sb-doped GeSe2 chalcogenide thin films are prepared by the magnetron co-sputtering method. The linear optical properties of as-deposited films are derived by analyzing transmission spectra. The refractive index rises and the optical band gap decreases from 2.08 eV to 1.41 eV with increasing the Sb content. X-ray photoelectron spectra further confirm the formation of a covalent Sb--Se bond. The third-order nonlinear optical properties of thin films are investigated under femtosecond laser excitation at 800 nm. The results show that the third-order nonlinear optical properties are enhanced with increasing the concentration of Sb. The nonlinear refraction indices of these thin films are measured to be on the order of 10-18 m2/W with a positive sign and the nonlinear absorption coefficients are obtained to be on the order of 10-10 m/W. These excellent properties indicate that Sb-doped Ge-Se films have a good prospect in the applications of nonlinear optical devices. 展开更多
关键词 chalcogenides films refractive index optical band gap nonlinear optical properties
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Thermal stability of magnetron sputtering Ge-Ga-S films 被引量:1
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作者 Lei Niu Yimin Chen +1 位作者 Xiang Shen Tiefeng Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第8期485-488,共4页
Ge-Ga-S thin films were deposited by magnetron sputtering with mean coordination number(MCN)ranging from 2.46 to 2.94.The physical properties of the Ge-Ga-S films,including optical band gap,refractive index,and thickn... Ge-Ga-S thin films were deposited by magnetron sputtering with mean coordination number(MCN)ranging from 2.46 to 2.94.The physical properties of the Ge-Ga-S films,including optical band gap,refractive index,and thickness,vary with the time of heat treatment.Based on the analysis of the topology model,it is concluded that the Ge-Ga-S thin films with components close to the stoichiometric ratio can form the most Ga-S bonds and Ga-S bonds,and the physical properties of the Ge27.3Ga6.3S66.3(MCN=2.62)film are the most stable.This is an important reference for thin film photonic devices. 展开更多
关键词 chalcogenide thin films refractive index optical band gap thermal stability
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Design and fabrication of GeAsSeS chalcogenide waveguides with thermal annealing
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作者 Limeng Zhang Jinbo Chen +4 位作者 Jierong Gu Yixiao Gao Xiang Shen Yimin Chen Tiefeng Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第3期320-325,共6页
We reported a chalcogenide glass-based rib waveguide fabricated using photolithography and dry etching method. A commercial software(COMSOL Multiphysics) was used to optimize the waveguide structure and the distributi... We reported a chalcogenide glass-based rib waveguide fabricated using photolithography and dry etching method. A commercial software(COMSOL Multiphysics) was used to optimize the waveguide structure and the distribution of the fundamental modes in the waveguide based on the complete vector finite component. We further employed thermal annealing to optimize the surface and sidewalls of the rib waveguides. It was found that the optimal annealing temperature for Ge As Se S films is 220℃, and the roughness of the films could be significantly reduced by annealing. The zero-dispersion wavelength(ZDW) could be shifted to a short wavelength around ~2.1 μm via waveguide structural optimization, which promotes supercontinuum generation with a short wavelength pump laser source. The insertion loss of the waveguides with cross-sectional areas of 4.0 μm×3.5 μm and 6.0 μm×3.5 μm was measured using lens fiber and the cut-back method. The propagation loss of the 220℃ annealed waveguides could be as low as 1.9 d B/cm at 1550 nm. 展开更多
关键词 chalcogenide film dispersion engineering optical waveguide thermal annealing
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Second-harmonic Generation in UV-pulsed Laser Poled Amorphous 80GeS_2-15Ga_2 S_3-5CdS Chalcogenide Film
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作者 LIU Gang PENG Minhong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第6期1064-1067,共4页
With the pulsed laser deposition (PLD) method, amorphous 80GeS2-15Ga2S3-5CdS chalcogenide film was deposited on glassy substrate. Obvious second harmonic generation (SHG) was observed in the ultraviolet (UV)-pol... With the pulsed laser deposition (PLD) method, amorphous 80GeS2-15Ga2S3-5CdS chalcogenide film was deposited on glassy substrate. Obvious second harmonic generation (SHG) was observed in the ultraviolet (UV)-polarized film and the SHG intensity increased with the increase in single pulse energy and irradiation time. Through Raman spectra and transmission spectra, the mechanism of SHG was studied. The experimental results demonstrated that effective electron traps and hole traps were generated in the UV- polarized film. The energy of electrons and holes was using up due to the collision with other particles and crystal fields during their movement and finally they were captured by the traps and fixed, which made the electric charge distribution nonuniform in the film and destroyed the spatial isotropy. In the meantime, the center of positive and negative charges separated and a built-in electric field was formed which generated the optical second-order nonlinearity of the film. 展开更多
关键词 amorphous GeS2-Ga2S3-CdS chalcogenide film UV-pulsed laser poled second harmonicgeneration maker fringes
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Variable angle spectroscopic ellipsometry and its applications in determining optical constants of chalcogenide glasses in infrared
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作者 Ning-Ning Wei Zhen Yang +6 位作者 Hong-Bo Pan Fan Zhang Yong-Xing Liu Rong-Ping Wang Xiang Shen Shi-Xun Dai Qiu-Hua Nie 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第6期454-460,共7页
The principle of variable angle spectroscopic ellipsometry(VASE) and the data analysis models, as well as the applications of VASE in the characterization of chalcogenide bulk glasses and thin films are reviewed. By... The principle of variable angle spectroscopic ellipsometry(VASE) and the data analysis models, as well as the applications of VASE in the characterization of chalcogenide bulk glasses and thin films are reviewed. By going through the literature and summarizing the application scopes of various analysis models, it is found that a combination of various models, rather than any single data analysis model, is ideal to characterize the optical constants of the chalcogenide bulk glasses and thin films over a wider wavelength range. While the reliable optical data in the mid-and far-infrared region are limited, the VASE is flexible and reliable to solve the issues, making it promising to characterize the optical properties of chalcogenide glasses. 展开更多
关键词 chalcogenide glasses/thin films VASE optical constants INFRARED
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PLD Preparation of GeS_6 Amorphous Film and Investigation on Its Photo-induced Darkening Phenomenon
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作者 刘刚 顾少轩 +2 位作者 ZHANG Haochun ZHANG Ning TAO Haizheng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第4期665-668,共4页
GeS6 chalcogenide amorphous fi lm was deposited on glass substrate via PLD(pulsed laser deposition) technique. The performance and structure of the fi lm was characterized by XRD(X-ray diffraction), SEM(Scanning ... GeS6 chalcogenide amorphous fi lm was deposited on glass substrate via PLD(pulsed laser deposition) technique. The performance and structure of the fi lm was characterized by XRD(X-ray diffraction), SEM(Scanning Electron Microscopy), EDS(Energy Dispersive Spectroscopy), optical transmission spectra, and Raman spectra, etc. The GeS6 amorphous fi lm was irradiated by 532 nm linearly polarized light, and its photoinduced darkening was investigated. The results showed that the GeS6 chalcogenide amorphous fi lm was smooth and compact with uniform thickness and combined with the substrate fi rmly, and its chemical composition was in consistency with the bulky target. When laser energy was fi xed, the transparence of the fi lm declined with the increase of the laser irradiation time. Obvious photo-induced darkening and relaxation phenomenon of the fi lm after laser irradiation were observed in this investigation. 展开更多
关键词 GeS_6 chalcogenide amorphous film pulsed laser deposition photo darkening
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High-Q ring resonators directly written in As2S3 chalcogenide glass films 被引量:3
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作者 Shahar Levy Matvei Klebanov Avi Zadok 《Photonics Research》 SCIE EI 2015年第3期63-67,共5页
Planar ring resonator waveguides are fabricated in thin films of As2S3 chalcogenide glass,deposited on silicaon-silicon substrates.Waveguide cores are directly written by scanning the focused illumination of a femtose... Planar ring resonator waveguides are fabricated in thin films of As2S3 chalcogenide glass,deposited on silicaon-silicon substrates.Waveguide cores are directly written by scanning the focused illumination of a femtosecond Ti:sapphire laser at a central wavelength of 810 nm,through a two-photon photo-darkening process.A large photoinduced index change of 0.3–0.4 refractive index units is obtained.The radius of the ring resonator is 1.9 mm,corresponding to a transmission free spectral range of 9.1 GHz.A high loaded(intrinsic) Q value of 110,000(180,000) is achieved.The thermal dependence of the resonator transfer function is characterized.The results provide the first report,to the best of our knowledge,of directly written high-Q ring resonators in chalcogenide glass films,and demonstrate the potential of this simple technique towards the fabrication of planar lightguide circuits in these materials. 展开更多
关键词 RING AS High-Q ring resonators directly written in As2S3 chalcogenide glass films
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The influence of sequence of precursor films on CZTSe thin films prepared by ion-beam sputtering deposition
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作者 Jun Zhao Guangxing Liang +4 位作者 Yang Zeng Ping Fan Juguang Hu Jingting Luo Dongping Zhang 《Journal of Semiconductors》 EI CAS CSCD 2017年第2期15-19,共5页
The CuZnSn(CZT) precursor thin films are grown by ion-beam sputtering Cu, Zn, Sn targets with different orders and then sputtering Se target to fabricate Cu_2ZnSnSe_4(CZTSe) absorber thin films on molybdenum subst... The CuZnSn(CZT) precursor thin films are grown by ion-beam sputtering Cu, Zn, Sn targets with different orders and then sputtering Se target to fabricate Cu_2ZnSnSe_4(CZTSe) absorber thin films on molybdenum substrates. They are annealed in the same vacuum chamber at 400 ℃. The characterization methods of CZTSe thin films include X-ray diffraction(XRD), energy dispersive spectroscopy(EDS), scanning electron microscopy(SEM), and X-ray photoelectron spectra(XPS) in order to study the crystallographic properties, composition, surface morphology, electrical properties and so on. The results display that the CZTSe thin films got the strongest diffraction peak intensity and were with good crystalline quality and its morphology appeared smooth and compact with a sequence of Cu/Zn/Sn/Se, which reveals that the expected states for CZTSe are Cu^(1+), Zn^(2+), Sn^(4+), Se^(2).With the good crystalline quality and close to ideal stoichiometric ratio the resistivity of the CZTSe film with the sequence of Cu/Zn/Sn/Se is lower, whose optical band gap is about 1.50 eV. 展开更多
关键词 CZTSe thin films ion-beam sputtering chalcogenide
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Optimization of SnS active layer thickness for solar cell application 被引量:2
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作者 Yashika Gupta P.Arun 《Journal of Semiconductors》 EI CAS CSCD 2017年第11期15-21,共7页
This work presents a comparative study of n-SnS and p-SnS active layers for increased solar cell efficiency. Tin sulphide thin films of various thicknesses having p-type and n-type conductivity were fabricated by ther... This work presents a comparative study of n-SnS and p-SnS active layers for increased solar cell efficiency. Tin sulphide thin films of various thicknesses having p-type and n-type conductivity were fabricated by thermal evaporation. Both type of films had the same(113) orientation of the crystal planes with a constant tensile strain of ~ 0.003 and ~ 0.011, respectively. The persistent photocurrent was observed in all n-SnS and p-SnS samples with the current's time decay constant decreasing with increasing film thickness. Hole mobility of thicker p-SnS films was found to be greater than the electron mobility in n-SnS samples, with mobility(both hole and electron) showing an increasing trend with film thickness. The optimum absorber layer thickness for both p-and n-SnS layers should have a high value of diffusion length for a given absorption coefficient and band-gap. 展开更多
关键词 thin film chalcogenides optical properties
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