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Investigation of the 6H-SiC (0001) surface by AFM

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Journal of University of Science and Technology Beijing 2008年第5期15卷 654-658页

作者： shouzhen jiang Guangwei Yu Yingmin Wang Xiaobo Hu Xiangang Xu Minhua jiang State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China College of Physics and Electronics Shandong Normal University Jinan 250014 China

Micropipe and step structures on 6H-SiC （0001） surface were investigated by an atomic force microscopy （AFM）. On the facet,all micropipes examined are the origins of spiral steps,indicating that dislocations intersect the surface at these points. Micropipes are empty-core super-dislocations as originally described by Frank. The micropipe radius increases with the square of the dislocation Burgers vector. From the center to the periphery,step structures change with different surface inclinations. Regular step is observed within the central faceted area. Step bunching and atomically rough surfaces are observed within the peripheral convex area. If the inclination with respect to the （0001） plane is large enough,step bunching of 15R-SiC can be observed.

关键词： atomic force microscopy micropipes step bunching polytypes

Surface Polishing of 6H-SiC Substrates

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Journal of Materials Science & Technology 2007年第3期23卷 430-432页

作者： Xiufang CHEN Xiangang XU Juan LI shouzhen jiang Lina NING Yingmin WANG Deying MA Xiaobo HU Minhua jiang State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

The surface polishing for silicon carbide （SIC） substrates was investigated and results were presented for mechanical polishing （MP） and chemo-mechanical polishing （CMP）. High quality surfaces were obtained after CMP with colloidal silica. The removal mechanism of scratches in MP and detailed physical and chemical process during CMP were analyzed. The effects of MP and CMP on the surface roughness were assessed by optical microscopy （OM）, atomic force microscopy （AFM） and step profilometry. KOH etching and high resolution X-ray diffractometry （H RXRD） were applied to evaluate the subsurface damage of 6H-SiC substrates.

关键词： SiC Chemo-mechanical polishing (CMP) Roughness Subsurface damage

Compact Q-switched 2 μm Tm:GdVO4 laser with MoS2 absorber

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Photonics Research 2015年第5期3卷 256-259页

作者： Pingguang Ge Jie Liu shouzhen jiang Yuanyuan Xu Baoyuan Man Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal University

A molybdenum disulfide（Mo S2） saturable absorber was fabricated by thermally decomposing the ammonium thiomolybdate. By using the MoS2 absorber, a compact diode-pumped passively Q-switched Tm:GdVO4 laser has been demonstrated. A stable Q-switched laser with repetition rates from 25.58 to 48.09 kHz was *** average output power was 100 mW with the shortest pulse duration of 0.8 μs. Maximum pulse energy is 2.08 μJat center of 1902 nm.

关键词： Mo m Tm:GdVO4 laser with MoS2 absorber Compact Q-switched 2 Tm

Low-Angle Grain Boundaries in Sublimation Grown 6H-SiC Crystals

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Journal of Rare Earths 2006年第Z1期24卷 8-10页

作者： jiang shouzhen Li Xianxiang Dong Jie Chen Xiufang Xu Xiangang Hu Xiaobo State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

High-resolution X-ray diffractometry(HRXRD)was used to assess the quality of 6H-SiC crystals grown by sublimation *** results show the occurrence of low-angle grain boundaries(LB)is close relative to the inclination of the crystal *** the central faceted region with 0°inclination the crystal is of high structural ***,at the region close to the facet with less than 5°inclination LB occurs slightly and at the region close to the peripheral polytype ring with more than 5°inclination LB defect occurs *** density of LB can be drastically reduced by decreasing radial temperature gradient that determines the shape of the crystal growth interface.

关键词： low-angle grain boundaries sublimation 6H-SiC radial temperature gradient

Relaxation of residual stresses in SiC wafers by annealing

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Rare Metals 2006年第6期25卷 704-708页

作者： CHEN Xiufang XU Xiangang HU Xiaobo LI Juan WANG Yingmin jiang shouzhen ZHANG Kai State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Residual stresses in SiC wafers, which were introduced during production processes including sawing, lapping, mechanical polishing （MP）, and chemical-mechanical polishing （CMP）, were evaluated in terms of changes in radius of curvature and high-resolution X-ray diffractometer （HRXRD） measurements. It was found that annealing was an effective method to reduce stress fields and to improve the wafer flatness. Lapping process generated more residual stresses than other machining processes, and these stresses could be relaxed by thermal treatment. The results showed that annealing was an essential procedure following lapping in the whole production process. The molten KOH etching results accounted for the correlation between the relaxation of stresses and the creation of basal screw dislocations.

关键词： SiC annealing residual stress mechanical polishing chemical-mechanical polishing

Optical fiber SPR biosensor complying with a 3D composite hyperbolic metamaterial and a graphene film

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Photonics Research 2021年第3期9卷 379-388页

作者： Can Li Jinjuan Gao Muhammad Shafi Runcheng Liu Zhipeng Zha Dejun Feng Mei Liu Xuejian Du Weiwei Yue shouzhen jiang Collaborative Innovation Center of Light Manipulations and Applications in Universities of Shandong School of Physics and Electronics Shandong Normal UniversityJinan 250014China Shandong Key Laboratory of Medical Physics and Image Processing&Shandong Provincial Engineering and Technical Center of Light Manipulations Jinan 250014China School of Information Science and Engineering Shandong UniversityQingdao 266237China Shandong Key Laboratory of Biophysics Institute of BiophysicsDezhou UniversityDezhou 253023China

In the present study, an optical fiber surface plasmon resonance(SPR) biosensor was developed for measuring time-and concentration-dependent DNA hybridization kinetics. Its design complies with a 3D Au∕Al2O3 multilayer composite hyperbolic metamaterial(HMM), a graphene film, and a D-shaped plastic optical *** to the numerical simulation and the experimental demonstration, the SPR peak of the designed biosensor can be effectively altered in the range of visible to near-infrared by varying the HMM structure. The sensitivity of the appliance was shown to achieve a value of up to 4461 nm/RIU, allowing its applicability for bulk refractive index sensing. Furthermore, a biosensor designed in this work displayed high-resolution capability(ranging from 10 pM to 100 nM), good linearity, and high repeatability along with a detection limit down to 10 pM, thus suggesting a vast potential for medical diagnostics and clinical applications.

关键词： fiber film composite

Evanescent Wave Absorption Sensor Based Tapered Plastic Optical Fiber Coated with Monolayer Graphene for Ethanol Molecules Detection

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Chinese Journal of Chemistry 2016年第10期34卷 1039-1047页

作者： shouzhen jiang Hengwei Qiu Saisai Gao Peixi Chen Zhen Li Kaiyang Yu Weiwei Yue Cheng Yang Yanyan Huo Shuyun Wang School of Physics and Electronics Shandong Normal University Jinan Shandong 250014 China

An evanescent wave absorption （EWA） sensor based tapered plastic optical fiber （TPOF） coated with monolayer graphene film for ethanol molecules detection is demonstrated in this study. The continuous and monolayer graphene films were grown on a Cu foil by using chemical vapor deposition （CVD） technology. Polymethyl methacrylate （PMMA） was used as the carrier to support the transfer of graphene from Cu foil to the skinless tapered optical fiber core. The accuracy of the TPOF sensor with graphene （G-TPOF sensor） is much higher than that without gra- phene （TPOF sensor）, which can be attributed to the molecules enriched on the surface of graphene. The absorbance （A） and the concentrations of ethanol solution show an excellent proportional relationship in a range of 0--100%. The dynamic response of the G-TPOF sensor has shown strong reversibility, repeatability and stability at room temperature. The response time and recovery time of the G-TPOF sensor for different concentrations are all less than 30 s. Beyond that, we selected the Chinese liquor as the analyte, and the results are consistent with the concen- tration-list obtained in the experiment.

关键词： graphene evanescent wave absorption tapered plastic optical fiber sensor

Hybrid rogue waves and breather solutions on the double-periodic background for the Kundu-DNLS equation

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Communications in Theoretical Physics 2024年第5期76卷 33-48页

作者： DongZhu jiang Zhaqilao College of Mathematics Science Inner Mongolia Normal UniversityHohhot 01022China Center for Applied Mathematical Science Inner MongoliaHohhot 010022China

In this paper,by using the Darboux transformation(DT)method and the Taylor expansion method,a new nth-order determinant of the hybrid rogue waves and breathers solution on the double-periodic background of the Kundu-DNLS equation is constructed when n is *** and rogue waves can be obtained from this determinant,*** to this,the hybrid rogue waves and breathers solutions on the different periodic backgrounds are given explicitly,including the single-periodic background,the double-periodic background and the plane wave background by selecting different *** addition,the form of the obtained solutions is summarized.

关键词： double-periodic background hybrid rogue waves and breather darboux transformation Kundu-DNLS equation

Highly homogeneous zero-index metamaterials make devices more compact and perform better

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Light(Science & Applications) 2024年第5期13卷 806-807页

作者： Wei-Xiang jiang State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast University210096 NanjingChina

A highly homogeneous microwave zero-index metamaterial based on high-permittivity SrTiO3 ceramics is demonstrated to realize the small-aperture high-directivity *** a novel technique is a remarkable step forward to de... 详细信息

关键词： ceramics SrTiO3 Highly