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Photonics Research 2022年第5期10卷 1170-1176页

作者： JING ZHANG CHENXI HAO WANHUA ZHENG DIETER BIMBERG ANJIN LIU State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Solid-State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Bimberg Chinese-German Center for Green Photonics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Institute of Solid State Physics and Center of Nanophotonics Technische Universitat Berlin10623 BerlinGermany

We experimentally demonstrate for the first time to our knowledge electrically injected vertical-cavity surfaceemitting lasers(VCSELs) with post-supported high-contrast gratings(HCGs) at 940 nm. The HCG-VCSELs have two posts to support the air-suspended HCGs, which are realized by simple fabrication without critical point drying. The HCG-VCSEL achieves a threshold current of about 0.65 m A and a side-mode suppression ratio of 43.6 d B under continuous-wave operation at 25℃. Theoretically the HCG-VCSEL with a λ∕2-cavity for the transverse magnetic polarization has a smaller effective mode length of 1.38 ·(λ∕n). Thus, the relaxation resonance frequency can be increased by 16% compared with that of the conventional VCSEL. The modulation speed of 100 Gbit/s for the HCG-VCSEL is expected in the on–off keying modulation format. Our easy design of HCGVCSELs has great potential for applications in optical interconnects, sensing, illumination, and so on.

关键词： polarization cavity surface

Assembly of an Elastic & Sticky Interfacial Layer for Sulfide-Based All-solid-state Batteries

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SSRN 2023年

作者： Su, Yu Liu, Xiangsi Yan, Hao Zhao, Jun Cheng, Yong Luo, Yu Gu, Jiabao Zhong, Haoyue Fu, Ang Wang, Kangjun Wang, Mingsheng Huang, Jianyu Yan, Jiawei Yang, Yong State Key Laboratory for Physical Chemistry of Solid Surface Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Pen-Tung Sah Institute of Micro-Nano Science and Technology College of Materials Xiamen University Xiamen361005 China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

All-solid-state lithium-ion batteries (ASSLBs) have recently attracted significant attention, however, two major degradation processes at the composite cathode interface in ASSLBs, including side electro-chemical reactions and morphological/structural degradation, still hinder their development seriously. To overcome the above two challenges simultaneously, we propose and demonstrate a successful assembly of an elastic & sticky interfacial layer for ASSLBs by using advanced molecular layer deposition (MLD) technique. Our spectroscopic and mechanical characterization results show that the elastic and sticky Al-GL coating layer (Young’s modulus = 0.17GPa, k = 3.300 N m-1) not only suppresses interfacial side reactions, but also enables single-crystal NCM811 particles to be in close contact with the sulfide electrolyte tightly during repeated cycles. Compared to the irreversible interfacial resistance (51.74 Ω cm-2) formed between bare NCM811 and solid electrolyte during the initial charge progress, the irreversible resistance becomes much less (11.77 Ω cm-2) after Al-GL modification. Therefore, it not only shows a capacity retention of 88.0 % of the composite electrode, which is nearly 30 % higher than bare NCM811 (59.9 %) for 100 cycles at 0.2C (1C =180 mA g-1) with a mass loading of 10.2 mg cm-2 at 30 °C. Furthermore, even with a mass loading of 20.4 mg cm-2 at 60 °C, the capacity retention of 80.0 % is obtained after 1000 cycles at 1C. This work highlights the critical role of elastic and sticky coatings in maintaining the electrochemical-mechanical integrity of composite cathode materials and provides a promising avenue for developing mechanically reliable cathode materials for ASSLBs. © 2023, The Authors. All rights reserved.

关键词： solid electrolytes

Measurement of Water Diffusion Coefficient in Cross-Linked Gelatins Using the Terahertz Time-Domain Spectroscopy Technique

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Measurement of Water Diffusion Coefficient in Cross-Linked G...

2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Walden, D. Chakraborty, D. Cheng, J. Straksys, A. Stirke, A. Melo, W.C.M.A. Jukna, A. Komissarov, I. Sobolewski, Roman Department of Physics and Astronomy University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623-1299 United States Materials Science Graduate Program University of Rochester RochesterNY14627 United States State Research Institute Center for Physical Sciences & Technology Vilnius Lithuania Department of Physics Vilnius Gediminas Technical University Vilnius Lithuania Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States

A novel method has been developed to evaluate the water diffusion dynamics in gelatin-based gels, based on transient terahertz time-domain spectroscopy measurements. Such gels are widely used models for human skin. &#... 详细信息

ISBN: (纸本)9781957171395

关键词： Transient analysis

The application of aromaticity and antiaromaticity to reaction mechanisms

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Fundamental Research 2023年第6期3卷 926-938页

作者： Qin Zhu Shuwen Chen Dandan Chen Lu Lin Kui Xiao Liang Zhao Miquel Solà Jun Zhu State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Key Laboratory for Organic Electronics&Information Displays(KLOEID)and Institute of Advanced Materials(IAM) SICAMNanjing University of Posts&TelecommunicationsNanjing 210023China Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China Institute of Computational Chemistry and Catalysis and Department of Chemistry University of GironaC/M.Aurèlia Capmany6917003 GironaCataloniaSpain School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China

Aromaticity,in general,can promote a given reaction by stabilizing a transition state or a product via a mobility ofπelectrons in a cyclic ***,such a promotion could be also achieved by destabilizing an antiaromatic ***,both aromaticity and transition states cannot be directly measured in ***,computational chemistry has been becoming a key tool to understand the aromaticity-driven reaction *** this review,we will analyze the relationship between aromaticity and reaction mechanism to highlight the importance of density functional theory calculations and present it according to an approach via either aromatizing a transition state/product or destabilizing a reactant by ***,we will start with a particularly challenging example of dinitrogen activation followed by other small-molecule activation,Csingle bondF bond activation,rearrangement,as well as metathesis *** addition,antiaromaticity-promoted dihydrogen activation,CO_(2)capture,and oxygen reduction reactions will be also briefly ***,caution must be cast as the magnitude of the aromaticity in the transition states is not particularly high in most ***,a proof of an adequate electron delocalization rather than a complete ring current is recommended to support the relatively weak aromaticity in these transition states.

关键词： Aromaticity Antiaromaticity Reaction mechanism Frustrated Lewis pairs Dinitrogen activation Small molecule activation

Electron dynamics of active mode-locking terahertz quantum cascade laser

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Chinese Physics B 2020年第12期29卷 438-441页

作者： Qiushi Hou Chang Wang Juncheng Cao Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The pulse generation from active mode-locking terahertz quantum cascade laser is studied by Maxwell-Bloch *** is shown that longer dephasing time will lead to multiple pulses generation from the *** dependence of output field on modulation length and radio-frequency parameters is *** order to achieve short pulse generation,the DC bias should close to threshold value and modulation length should be shorter than 0.256 *** output pulse is unstable and the envelope shows many oscillations in the presence of spatial hole burning,resulting destabilization of mode-locking.

关键词： terahertz(THz) quantum cascade lasers(QCLs) mode-locking spatial hole burning(SHB)

Bioinspired Multi-Crosslinking and solid-Liquid Composite Lubricating Mxene/Pva Hydrogel Based on Salting Out Effect

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SSRN 2023年

作者： Miao, Xiaonan Liu, Shuwen Li, Zhangpeng Hou, Kaiming Gao, Qiulong Huang, Yan Wang, Jinqing Yang, Shengrong State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Yantai264006 China Qingdao Center of Resource Chemistry & New Materials Qingdao266000 China

Due to the unique synergistic lubrication mechanisms, solid-liquid composite lubrication has received widespread attention in tribology. However, the cumbersome preparation process and solid-liquid separated service conditions limit its practical application. Inspired by the phenomenon of cell dehydration in electrolyte solutions, a simple salting out method is performed to develop multi-crosslinked and salted out MXene/polyvinyl alcohol (PVA) (MS-MP) hydrogels that can controllably release water, achieving solid-liquid composite lubrication in a single material. In this work, zinc ions (Zn2+) with both multi-crosslinking effect and salting out effect are incorporated into MXene/PVA hydrogels. These effects not only induce the formation of crystalline domains and the strengthening of network structure of hydrogels, but also release the water in hydrogels to realize the solid-liquid composite lubrication. Furthermore, the structure and tribological properties of MS-MP hydrogels can be regulated by adjusting the salting out degree, resulting in the acquisition of a structurally stable hydrogel with exceptional load-bearing capacity and superior lubrication performance. In brief, this work provides a novel and simple strategy for the fabrication of solid-liquid composite lubricating hydrogels, which shows great potential in fabricating liquid-containing lubrication materials and realizing controllable release of liquid lubricant. © 2023, The Authors. All rights reserved.

关键词： Hydrogels

Assembly of an Elastic & Sticky Interfacial Layer for Sulfide-Based All-solid-state Batteries

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SSRN 2023年

关键词： solid electrolytes

Measurement of Water Diffusion Coefficient in Cross-Linked Gelatins Using the Terahertz Time-Domain Spectroscopy Technique

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Measurement of Water Diffusion Coefficient in Cross-Linked G...

CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Terahertz spectroscopy

Fast Growth of Cspbbr3 Single Crystal with High Quality by a Modified Solvent-Evaporation Method

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SSRN 2023年

作者： Yu, Changzhi Zhang, Tianqi Zhou, Quan Chen, Guolong Fan, Xiaotong Wang, Shuli Zhong, Chenming Chen, Yihang Wu, Tingzhu Chen, Zhong Xiao, Jiawen Lin, Yue Department of Electronic Science Fujian Engineering Research Center for Solid-State Lighting Xiamen University Xiamen361005 Fujian China Beijing Key Lab of Microstructure and Property of Advanced Materials Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China Xiamen361005 Fujian China

Metal halide perovskite single crystal (SC) has attracted wide attention in the field of photoelectric detection. All-inorganic perovskite SCs are much more stable than the hybrid counterparts, but its rapid fabrications usually end up low quality. We proposed a modified solvent-evaporation method that can rapidly obtain smooth and transparent high-quality CsPbBr3 single crystal with a surface roughness of only 5 nm in a few hours. In this method, the lattice phase of the SC and the growth rate is precisely controlled by the solution temperature, which is raised to the narrow range above the cubic-to-tetragonal phase transition temperature. This precisely controlled solvent temperature allows the CsPbBr3 SC growing immediately into cubic phase, and limits the volatilization rate of solvent, thus inhibiting the defect density. The SCs grown this way are of high crystallinity, as the half-height width of the (100) and (200) peaks of XRD rocking curve is 0.0154° and 0.0176°, respectively. Characterization of photoelectric properties shows great potential for applications in X-ray detection and photo detection. © 2023, The Authors. All rights reserved.

关键词： Single crystals

Gate-tuned ambipolar superconductivity with strong pairing interaction in intrinsic gapped monolayer 1T'-MoTe2

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arXiv

arXiv 2023年

作者： Tang, Fangdong Wang, Peipei Gan, Yuan Lyu, Jian Wang, Qixing Mi, Xinrun He, Mingquan Zhang, Liyuan Smet, Jurgen H. Max Planck Institute for Solid State Research Stuttgart70569 Germany Department of Physics Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Low Temperature Physics Laboratory College of Physics Center of Quantum Materials and Devices Chongqing University Chongqing401331 China

Gate tunable two-dimensional (2D) superconductors offer significant advantages when studying superconducting phase transitions. Here, we address superconductivity in exfoliated 1T’-MoTe2 monolayers with an intrinsic band gap of ~7.3 meV using electrostatic doping. Despite large differences in the dispersion of the conduction and the valence bands, superconductivity can be achieved easily for both electrons and holes. The onset of superconductivity occurs near 7-8K for both charge carrier types. This temperature is much higher than in bulk samples. Also the in-plane upper critical field is strongly enhanced and exceeds the BCS Pauli limit in both cases. Gap information is extracted using point-contact spectroscopy. The gap ratio exceeds multiple times the value expected for BCS weak-coupling. All these observations suggest a strong enhancement of the pairing interaction. Copyright © 2023, The Authors. All rights reserved.

关键词： Monolayers