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Telecom-band multiwavelength vertical emitting quantum well nanowire laser arrays

Light(science & Applications) 2024年第10期13卷 2405-2413页

作者： Xutao Zhang Fanlu Zhang Ruixuan Yi Naiyin Wang Zhicheng Su Mingwen Zhang Bijun Zhao Ziyuan Li Jiangtao Qu Julie MCairney Yuerui Lu Jianlin Zhao Xuetao Gan Hark Hoe Tan Chennupati Jagadish Lan Fu Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical University127 West Youyi Road710072 Xi’anChina Department of Electronic Materials Engineering Research School of PhysicsThe Australian National UniversityCanberra ACT 2600Australia Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi’anChina Australian Centre for Microscopy and Microanalysis the University of SydneySydney NSW 2006Australia School of Engineering College of EngineeringThe Australian National UniversityCanberra ACT 2600Australia ARC Centre of Excellence for Transformative Meta-Optical Systems Research School of PhysicsThe Australian National UniversityCanberra ACT 2600Australia

Highly integrated optoelectronic and photonic systems underpin the development of next-generation advanced optical and quantum communication technologies,which require compact,multiwavelength laser sources at the telecom ***,we report on-substrate vertical emitting lasing from ordered InGaAs/InP multi-quantum well core–shell nanowire array epitaxially grown on InP substrate by selective area *** reduce optical loss and tailor the cavity mode,a new nanowire facet engineering approach has been developed to achieve controlled quantum well nanowire dimensions with uniform morphology and high crystal *** to the strong quantum confinement effect of InGaAs quantum wells and the successful formation of a vertical Fabry–Pérot cavity between the top nanowire facet and bottom nanowire/SiO_(2) mask interface,stimulated emissions of the EH11a/b mode from single vertical nanowires from an on-substrate nanowire array have been demonstrated with a lasing threshold of~28.2μJ cm^(−2) per pulse and a high characteristic temperature of~128 *** fine-tuning the In composition of the quantum wells,room temperature,single-mode lasing is achieved in the vertical direction across a broad near-infrared spectral range,spanning from 940 nm to the telecommunication O and C *** research indicates that through a carefully designed facet engineering strategy,highly ordered,uniform nanowire arrays with precise dimension control can be achieved to simultaneously deliver thousands of nanolasers with multiple wavelengths on the same substrate,paving a promising and scalable pathway towards future advanced optoelectronic and photonic systems.

关键词： arrays tuning quantum

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Polarization modulation with optical lock-in detection reveals universal fluorescence anisotropy of subcellular structures in live cells

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Light(science & Applications) 2022年第1期11卷 50-62页

作者： Meiling Guan Miaoyan Wang Karl Zhanghao Xu Zhang Meiqi Li Wenhui Liu Jing Niu Xusan Yang Long Chen Zhenli Jing Micheal Q.Zhang Dayong Jin Peng Xi Juntao Gao Department of Biomedical Engineering College of Future TechnologyPeking UniversityBeijing 100871China UTS-SUStech Joint Research Centre for Biomedical Materials&Devices Department of Biomedical EngineeringCollege of EngineeringSouthern University of Science and TechnologyShenzhenGuangdongChina MOE Key Laboratory of Bioinformatics Bioinformatics DivisionCenter for Synthetic&Systems BiologyBNRistBeijingChina Center for Synthetic&Systems Biology Department of AutomationTsinghua UniversityBeijing 100084China Beijing Institute of Collaborative Innovation Beijing 100094China Department of Biological Sciences and Center for System Biology The University of Texas at DallasRichardson 75080USA School of Medical Sciences Tsinghua UniversityBeijing 100084China Institute for Biomedical Materials and Devices(IBMD) Faculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia National Biomedical Imaging Center Peking UniversityBeijing 100871China

The orientation of fluorophores can reveal crucial information about the structure and dynamics of their associated subcellular *** significant progress in super-resolution,fluorescence polarization microscopy remains limited to unique samples with relatively strong polarization modulation and not applicable to the weak polarization signals in samples due to the excessive background *** we apply optical lock-in detection to amplify the weak polarization modulation with *** novel technique,termed optical lock-in detection super-resolution dipole orientation mapping(OLID-SDOM),could achieve a maximum of 100 frames per second and rapid extraction of 2D orientation,and distinguish distance up to 50 nm,making it suitable for monitoring structural dynamics concerning orientation changes in ***-SDOM was employed to explore the universal anisotropy of a large variety of GFP-tagged subcellular organelles,including mitochondria,lysosome,Golgi,endosome,*** found that OUF(Orientation Uniformity Factor)of OLID-SDOM can be specific for different subcellular organelles,indicating that the anisotropy was related to the function of the organelles,and OUF can potentially be an indicator to distinguish normal and abnormal cells(even cancer cells).Furthermore,dual-color super-resolution OLID-SDOM imaging of lysosomes and actins demonstrates its potential in studying dynamic molecular *** subtle anisotropy changes of expanding and shrinking dendritic spines in live neurons were observed with real-time *** previously unobservable fluorescence anisotropy in various samples and indicating their underlying dynamic molecular structural changes,OLID-SDOM expands the toolkit for live cell research.

关键词： anisotropy Polarization concerning

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Self-Attenuating Graphene-Based Antennas Utilizing Polyvinylidene Fluoride (PVDF) Substrates

Self-Attenuating Graphene-Based Antennas Utilizing Polyvinyl...

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Microwave and Antenna Symposium (IMAS), International

作者： Josef Frankhouse Evans Addo-Mensah Uche Wejinya Department of Mechanical Engineering University of Arkansas - Fayetteville Materials Science and Engineering Graduate Program University of Arkansas - Fayetteville

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending.

关键词： Microwave antennas Patch antennas Graphene Resonant frequency Prototypes Bandwidth Bending Loss measurement Substrates Terahertz communications

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Highly stable hybrid single-micelle:A universal nanocarrier for hydrophobic bioimaging agents

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Nano Research 2022年第5期15卷 4582-4589页

作者： Qiaoyu Zhou Tiancong Zhao Mengli Liu Dongrui Yin Minchao Liu Ahmed AElzatahry Fan Zhang Dongyuan Zhao Xiaomin Li Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersiChemShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433China Materials Science and Technology Program College of Arts and SciencesQatar UniversityPO Box 2713DohaQatar

As the first-line technology,micelles play a pivotal role in in vivo delivery of theranostic agents because of their high biocompatibility and ***,in complex physiological environments(extreme dilution,pH,and oxidation or reduction,etc.),they generally suffer from structural instability and insufficient protection for encapsulated *** is urgent to reinforce the structural stability of the micelles at the single-micelle *** using the FDA-approved Pluronic F127 surfactants and indocyanine green(ICG)bioimaging agents as model,herein,we propose the silane-crosslinking assisted strategy to reinforce the structural stability of the *** from the traditional silane hydrolysis under the harsh experimental conditions(acidic,alkaline,and high temperature hydrothermal,etc.),the ICG loaded F127@SiO_(2) hybrid single-micelles(ICG@H-micelles)with controllable sizes(15-35 nm)are synthesized at neutral pH and room temperature,which is crucial for the maintenance of the physicochemical properties of the encapsulated *** the ultra-thin SiO_(2)(<5 nm)at hydrophilic layer of the single-micelle,the structural and fluorescence stability of ICG@H-micelles are much higher than the conventional micelle(ICG@micelles)in the simulated physiological environments of dilution,oxidation or reduction,and low *** of the high structural and fluorescence stability,the ICG@H-micelles also exhibit longer duration time in the tumor and gastrointestinal tract bioimaging.

关键词： micelle SiO_(2) inorganic-organic hybrid mesoporous material bioimaging

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A physics-constrained deep learning surrogate model of the runaway electron avalanche growth rate

arXiv

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arXiv 2024年

作者： Arnaud, Jonathan Mark, Tyler McDevitt, Christopher J. Nuclear Engineering Program Department of Materials Science and Engineering University of Florida GainesvilleFL32611 United States

A surrogate model of the runaway electron avalanche growth rate in a magnetic fusion plasma is developed. This is accomplished by employing a physics-informed neural network (PINN) to learn the parametric solution of the adjoint to the relativistic Fokker-Planck equation. The resulting PINN is able to evaluate the runaway probability function across a broad range of parameters in the absence of any synthetic or experimental data. This surrogate of the adjoint relativistic Fokker-Planck equation is then used to infer the avalanche growth rate as a function of the electric field, synchrotron radiation and effective charge. Predictions of the avalanche PINN are compared against first principle calculations of the avalanche growth rate with excellent agreement observed across a broad range of parameters. © 2024, CC BY.

关键词： Fokker Planck equation

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An ultraefficient surface functionalized Ti3C2Tx MXene piezocatalyst: synchronous hydrogen evolution and wastewater treatment

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Journal of materials Chemistry A 2023年第6期12卷 3340-3351页

作者： Lai, Sz-Nian Chen, Winston Yenyu Yen, Chao-Chun Liao, Yin-Song Chen, Po-Han Stanciu, Lia Wu, Jyh Ming Department of Materials Science and Engineering National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan PhD Program in Prospective Functional Materials Industry National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan High Entropy Materials Center National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan Tsing Hua Interdisciplinary Program National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan School of Materials Engineering Purdue University 610 Purdue Mall West LafayetteIN47907 United States Department of Materials Science and Engineering National Chung Hsing University 145 Xingda Road Taichung402 Taiwan

The Ti3C2Tx surface contains hydroxyl groups that can be modified through self-assembled monolayers by using (3-chloropropyl) trimethoxysilane (CPTMS) and fluoroalkylsilane (FOTS). This study demonstrates that an ultrahigh level of piezoelectricity can be achieved by modifying the Si-O bond of organo-silane headgroups in Ti3C2Tx. The theoretical calculation of surface functionalized Ti3C2Tx-FOTS reveals that its Si-O bond causes localized lattice distortion and enhances the noncentrosymmetric structure on the Ti3C2Tx surface. Ti3C2Tx-FOTS exhibits significantly higher butterfly loops than pristine Ti3C2Tx. The calculated rate constant of Ti3C2Tx-FOTS for dye degradation was 0.9 min−1, 15-fold higher than that of Ti3C2Tx-CPTMS and 111-fold higher than that of pristine Ti3C2Tx. The hydrogen evolution rate of Ti3C2Tx-FOTS is 900.46 μmo1 g−1 h−1, three times higher than that of Ti3C2Tx. The bifunctional surface functionalized Ti3C2Tx-FOTS can simultaneously catalyse the hydrogen evolution reaction (HER) and decomposition of wastewater, demonstrating that Ti3C2Tx-FOTS, obtained through the surface engineering of Ti3C2Tx, is a superior piezocatalyst. © 2024 The Royal Society of Chemistry.

关键词： Rate constants

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Method for assessing atomic sources of flicker noise in superconducting qubits

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npj Computational materials 2021年第1期7卷 1502-1507页

作者： Almog Reshef Maytal Caspary Toroker Department of Materials Science and Engineering Technion–Israel Institute of TechnologyHaifaIsrael The Nancy and Stephen Grand Technion Energy Program HaifaIsrael

Flicker noise causes decoherence in Josephson junction-based superconducting qubits,thus limiting their practical potential as building blocks for quantum *** is due to limited length and complexity of executable algorithms,and increased dependency on error-correcting ***,identifying and subsiding the atomic sources of flicker noise are of great importance to the development of this *** developed a method that combines ab initio DFT calculations and quantum dynamics to model charge transport across a Josephson junction,by which it is possible to more accurately assess different defects as sources of flicker *** demonstrate the use of our method in an investigation of various atomic defects,including vacancies,trapping,and substitutions,in an Al|Al_(2)O_(3)|Al Josephson *** demonstration both reveals weaknesses in previous attempts to pinpoint the atomic sources of flicker noise and highlights new candidates.

关键词： Josephson quantum limiting

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Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Rui Lin, Tong Luo, Jiaming Chen, Xiaotong Blackert, Elizabeth R. Moon, Alyssa R. JeBailey, Khalil M. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States Program Rice University Houston United States

ISBN: (纸本)9781957171258

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO3. We designed planar ultrafast concentrators that amplifies transient electric field by 6 times and measured an average field of 0.5 GV/m in an optically resolvable area in the far field. © 2023 The Author(s)

关键词： Perovskite

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Cross Scoop Fractal Antenna Design with Notch at 15 Degree for Emerging Applications at 5.2GHz

Cross Scoop Fractal Antenna Design with Notch at 15 Degree f...

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2024 International Conference on Recent Advances in Electrical, Electronics, Ubiquitous Communication, and Computational Intelligence, RAEEUCCI 2024

作者： Saravanakumar, R. Thommandru, Raju Krishna Kumar, E. Al Ansari, Mohammed Saleh Manage, Prabhakar S. Muthuvel, Suresh Kumar Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Saveetha University Department of ECE Chennai India Chalapathi Institute of Technology Department of ECE Andhra Pradesh Guntur India Park College of Engineering and Technology Department of Biomedical Engineering Coimbatore India College of Engineering University of Bahrain Department of Chemical Engineering Bahrain KLE Technological University's MSSCET Belagavi Campus Department of Electronics and Communication Belagavi Karnataka India Saveetha School of Engineering Saveetha Institute of Medical And Technical Science Saveetha University Department of Nano Electronics Materials and Sensors Chennai India

ISBN: (纸本)9798350354539

The Cross Scoop Interconnect Fractal Antenna emerges as a novel and promising solution for emerging wireless communication applications, offering enhanced performance and adaptability. Leveraging innovative design principles and simulation-driven optimization using HFSS (High-Frequency Structure Simulator), this antenna design introduces a unique configuration of cross-shaped elements with scoop-like ends, arranged in a fractal pattern. Through meticulous simulation analysis, the antenna demonstrates remarkable characteristics, including a radiation intensity of 0.2098 and an acceptance power of 29.997 dBm. The proposed design exhibits superior performance metrics, with a radiated power of 29.1417 dBm. This high-performance antenna is poised to address the evolving demands of modern wireless communication systems, catering to applications such as IoT, 5G networks, satellite communication, and beyond. Comparative analysis with prevailing antenna designs specifies the competitiveness and efficacy of the proposed Cross Scoop Interconnect Fractal Antenna in terms of gain, bandwidth coverage, and radiation efficiency. This research contributes significantly to the advancement of antenna technology, offering a versatile and efficient solution for various emerging wireless communication scenarios. Further experimental validation and real-world deployment are recommended to corroborate the simulation results and facilitate practical implementation, ultimately paving the way for the integration of this innovative antenna design into next-generation wireless communication systems. © 2024 IEEE.

关键词： Radiation efficiency

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FEM simulation and optimization on rotating extrusion of bi-metal rod with constant shear friction 8

FEM simulation and optimization on rotating extrusion of bi-...

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8th International Conference of Precision Machinery and Manufacturing Technology, ICPMMT 2023

作者： Huang, P.H. Huang, S.W. Teng, H.Y. Tzou, G.Y. Lu, C. Department of Mechanical Engineering National Yunlin University of Science and Technology Douliou Yunlin64002 Taiwan Department of Mechanical Engineering Institute of Mechatronic Engineering Cheng Shiu University Niaosong Kaohsiung83347 Taiwan School of Mechanical Materials Mechatronic and Biomedical Engineering Faculty of Engineering and Information Sciences University of Wollongong Northfields Ave. WollongongNSW2522 Australia

This study assuming constant shear friction adopts FEM simulation and the optimization to investigate into extrusion of bi-metal rod which consisted of Aluminum alloy (Core) and Copper alloy (Sleeve) with a rotating die taking tonto account the interface at bi-metal rod under the bonding situation. The forming characteristics, e.g. the effective stress, the effective strain, the velocity field, the extrusion force, the extrusion torque, and die stress can be gained by using FEM commercial software. The FEM optimization for extrusion force combines Taguchi method to establish the L934 orthogonal table that includes four control factors which are rotating angular velocity (ω), frictional factor at the interface of sleeve and die (m1), half die angle (α°), and inner die filet (R). The ranking of influence factors and the optimization combination can be obtained from FEM simulation to provide the reference to the industries. © Published under licence by IOP Publishing Ltd.

关键词： Dies

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