- by Chandra Prakash Singh and Kankat GhoshGreen micro-light emitting diodes (ĀµLEDs) with sub-100 Āµm dimensions are crucial for next-generation display technologies but remain constrained by the persistent āgreen gapā and low current density operation challenges. This work numerically investigates optimized epitaxial designs for 60 Ć 60 Āµm2 InGaN-based green ĀµLEDs operating at 1 A cmā2, exploring multiple configurations to reveal performance enhancing innovations and their underlying mechanisms. We propose a hybrid multiple quantum well design featuring four step-graded low-indium-content passive quantum wells paired with a single […]
- by Taisuke Horaguchi, Yuma Takeda and Takashi ManagoMagnonic crystals are artificial periodic structures that enable control over spin-wave propagation by introducing bandgaps (BGs) in the magnonic band structure. In this study, we systematically investigate how the wall-to-valley width ratio affects the magnonic band structure in one-dimensional magnonic crystals. Micromagnetic simulations demonstrate that as the wall width increases, the BG frequencies shift higher due to an increase in the effective film thickness. Additionally, the BG width exhibits an oscillatory dependence on the wall-to-valley ratio. These behaviors are attributed […]
- by Yulin Zhao, Feng Liang, Jianfei Han, Xiangjun Tan and Bing-Zhong WangTopological edge states have revolutionized our understanding of electromagnetic (EM) manipulation due to its topological robustness. Especially, reconfigurable topological photonic crystals will have desirable applications in optical devices. Here, we propose a dual reconfigurable topological insulator within a triangular lattice composed of all-dielectric Y-shaped cylinders. Liquid crystals (LCs) are employed to adjust the relative permittivity of background under an external electric field. As a result, topological edge states can be dynamically regulated by using LCs to manipulate photonic dispersions. Meanwhile, […]
- by Miao Tang, Jinxin Li, Haoran Zhang, Mingzhu Guo and Jinsui XuPlasma ignition technology faces the challenge of reduced arc stability or even flameout in the supersonic airflow environment. Although plasma ignition technology has improved the physical and chemical processes of fuel through special electrical, thermal, and chemical effects during the discharge process, the poor stability of the discharge arc in the supersonic flow field and the coupling between discharge arc and flow field have yet to be completely understood, which limits its development. This paper proposes a plasma igniter with […]
- by Zuowei Chen, Chenxi Zhu, Minghui Qi, Haozhe Wen, Yan Shao, Xinyi Wang and Yang LuoThis study proposes a multiplexed asymmetric metasurface that enables multifunctional terahertz (THz) wave manipulation via controlled material-induced symmetry breaking. Unlike conventional geometric asymmetry approaches, the symmetry breaking here stems from tailored material composition variations rather than structural modifications. Remarkably, this symmetry breaking preserves the metasurfaceās low-frequency response characteristics. It maintains a circular polarization conversion efficiency exceeding 95% and retains the PancharatnamāBerry phase property within the 0.635ā1.525 THz range. Intriguingly, symmetry breaking gives rise to sharp Fano resonances at high frequencies, […]
- by Ziyan Tan, Chan Li, Liyue Gong, Yuning Wang, Mingjian Zhang, Fei Gao, Yongxin Liu and Xianxiu MeiInfluence of pressure variation on the etching characteristics of various materials (including rough quartz, smooth quartz, monocrystalline silicon, polished monocrystalline silicon, and polycrystalline silicon) was investigated in a dual-frequency (60 MHz/400 kHz) capacitively coupled NF3/Ar/O2 plasma. The experimental results indicate that with increasing the pressure, the concentration of the fluorine radical in the plasma increases, which promotes the etching of quartz and silicon. Etching behavior varies for different surface types: for quartz, the rough surface exhibits a higher etch rate […]
- by Aleksandr I Iliasov, Andrey V Emelyanov, Vladimir V Rylkov, Anna N Matsukatova, Elena V Kukueva, Ivan D Kuchumov, Pavel A Forsh, Aleksandr V Sitnikov, Vyacheslav A Demin, Pavel K Kashkarov and Mikhail V KovalchukThis study investigates the properties and applications of Cu/(CoāFeāB)x(SiOz)100āx/LiNbOy/Cu (y ā¼ z ā¼ 1.4) nanocomposite (NC) memristors, with active layers acquired via ion-beam sputtering of stoichiometric LiNbO3 and compound Co40Fe40B20āSiO2 targets on the sitall substrate without external heating during the synthesis process. The devices exhibit quasi-analog resistive switching (RS), alongside high endurance exceeding 10 000 cycles between 2 states and 25 000 cycles between 50 states, which is advantageous for neuromorphic computing systems. The RS behavior is established to be […]
- by Lianshuang Ning, Weijie Fu and Xinming ZhangLaser local forming of glass materials provides a new, non-subtractive method for manufacturing optical surfaces. The shape of the molten pool plays a crucial role in the forming accuracy. Traditional studies often rely on the rigid coverage hypothesis, ignoring the influence of surface deformation on internal temperature and flow distribution. Based on the previously proposed surface model of the molten pool, this work presents an improved simulation framework for analyzing the internal shape evolution of laser-induced molten pools, incorporating viscosity-dependent […]
- by Pengfei Zhang, Chunyu Jia, Qiuyi Yue, Zifeng Wang, Zishuo Wang, Ying Liu, Zhongqi Wang, Shenghang Xu, Jie Liu, Jin Zhang, Jishen Zhang, Li Guo, Dingxin Liu and Hongxu JinHigh valence NOx generated by hybrid plasma configurations are promising for environmental disinfection, yet their practical applications face limitations. Dry disinfection using high-concentration gaseous high valence NOx risks air pollution, while spraying plasma-activated water (PAW) suffers from uneven coverage and prolonged treatment times. This paper utilizes a hybrid plasma configuration to generate plasma-activated gas (PAG) rich in high valence NOx, which is then combined with water mist for surface disinfection. Experimental results demonstrate that PAG-driven mist achieves complete inactivation of […]
- by Hao Shang, Huimiao Tang, Wenjun Ning, Xiang Wen, Saikang Shen, Xiaolong Huang and Shenli JiaThe skin structure, including surface geometry and layer thicknesses, significantly affects the behavior and therapeutic efficacy of atmospheric pressure plasma jets (APPJs). However, the interaction between APPJs and structurally varied skin remains insufficiently understood. In this study, a two-dimensional axisymmetric fluid model is developed to simulate APPJ-skin interactions. The effects of hair follicle, as well as the thicknesses of the epidermis, dermis, and fat layer, are analyzed, with particular emphasis on the fluxes of reactive species and the electric field […]
- by Jordan N Figueiredo, Bassam B Dally and Deanna A LacosteHydrogen plasma smelting reduction (HPSR) is an emerging technology for decarbonizing the iron and steel industry by utilizing hydrogen plasma as a reducing agent. This study investigates the effects of argon dilution and plasma-particle interactions in a non-equilibrium elongated arc of hydrogen for the in-flight smelting reduction of hematite particles. Using optical emission spectroscopy, electrical measurements, and x-ray diffraction analysis, we comprehensively characterize plasma properties and reduction performance. The results showed that the addition of iron oxide particles decreases the […]
- by M Xaubet, M Zanini, T Gerling, R Bansemer, T von Woedtke, K-D Weltmann, F Minotti and D GrondonaIn this work, the reactive species generated by two different plasma jet devices operated with ambient air as working gas are studied experimentally and theoretically. One jet device is based in a non-thermal arc, while the other consists of a dielectric barrier discharge (DBD) with two axial electrodes and a double dielectric barrier. The reactive oxygen and nitrogen species present in the jet effluents were measured by Fourier transform infrared absorption spectroscopy (FT-IR). A very different composition of reactive species […]
- by Zhaohong Wang, Shuheng Zhu and Yangyang ChuPhononic crystals (PCs) achieve precise acoustic wave manipulation by utilizing engineered band gaps properties arising from periodic structures or local resonance effects to enable. Traditional finite element methods struggle to simultaneously optimize band gaps accuracy, width, and structural robustness. Besides, existing machine learning approaches, despite advancing forward prediction capabilities, remain are constrained by the non-uniqueness issue in band-structure mapping during inverse design. This study presents a physics-informed deep learning framework integrating adaptive composite loss functions and dual-branch feature extraction to […]
- by Qixun Guo, Kailong Hu, Yiya Huang, Yifan Li, Xianglong Wen, Xiulan Xu, Jiao Teng, Tao Zhu and Guanghua YuThe orbital Hall effect and its experimental detection in the weakly spin-orbit coupled 3d metals, such as Cr, have attracted considerable research attention due to the gigantic orbital Hall conductivity and the novel orbital degree of freedom. Here, we investigate damping-like torque (DLT) and field-like torque (FLT) efficiencies of Cr-based CoFeB/MgO layered structures with perpendicular magnetic anisotropy by varying the thickness of the MgO layer. Our studies indicate that the MgO thickness can influence the oxidation degree of CoFeB, and […]
- by E V Bolotina, D V Savelev, L Y Fetisov, A V Turutin, I V Kubasov, A A Temirov, V V Kuts, A I Bazlov, A A Klimov, N N Perova and Y K FetisovThis paper investigates the influence of annealing in a magnetic field on the magnetoelectric (ME) properties of monolithic MetglasālangatateāMetglas heterostructure. The composite structure comprises amorphous magnetic Metglas layers (Fe77.5Co4.3Si7.2B11) deposited by magnetron sputtering onto a single-crystal langatate (La3Ga5.5Ta0.5O14) substrate. The langatate crystal was selected due to its favorable piezoelectric properties, high temperature stability, and absence of pyroelectric effects. Annealing significantly improved both the linear and nonlinear ME effects, resulting in a 7.6-fold increase in the linear ME coefficient, reaching 72 […]
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