- by David R Smith, Nivedan Vishwanath, Michael Zepp, Matthias Beuting, Daniel J Den Hartog, Benedikt Geiger, Scott T Sanders, Xuting Yang and Jennifer T ChoyEntangled two-photon absorption (ETPA) exhibits a quantum-enhanced two-photon absorption cross-section and a linear scaling with incident power that exceeds classical two-photon absorption (TPA) at low photon flux. Here, we assess the feasibility and applications of ETPA for active plasma spectroscopy. The ETPA-absorbed power for an Ar+ species in a helicon plasma scenario is calculated to be as high as 0.6 nW cm−1 along the incident beam path for nondegenerate-entangled photon pairs that are near-resonant with an intermediate level. The ETPA absorption power […]
- by Iryna Litovko, Martin Rudolph and André AndersThis work provides a quantitative analysis of what it would take to fully evaporate copper macroparticles embedded in a cathodic arc plasma flow. This analysis is important for the justification of efforts to develop an evaporation scheme based on adding an electron beam. We want to explore if this approach could be an alternative to conventional plasma filtering to obtain macroparticle-free plasma from a cathodic arc plasma source. If successful, cathodic arc plasma deposition could be extended from a popular […]
- by Kailun Zhang, Henrik Feuk, Jakob Ängeby, Andreas Ehn and Mattias RichterReducing greenhouse gas emissions and achieving carbon neutrality require enhancing spark-ignition engine efficiency and compatibility with renewable fuels. However, electrode wear of spark plugs presents a significant challenge in hydrogen-fueled spark-ignition internal combustion engines. Such excessive wear increases the total cost of ownership and may delay the introduction of such low-emission transportation alternatives. Hence, understanding the interaction between spark discharges and the electrodes to reveal the mechanisms of such wear is crucial. Unlike conventional, ex-situ long-term tests, laser-induced fluorescence (LIF) […]
- by Zunrong Sheng, Dongxue Feng, Di Dou, Guoqiang Liu, Zhishang Wang, Yongqiang Fu, Jie Li and Nan JiangHelium atmospheric pressure plasma jet (He-APPJ) holds substantial promise for accelerating wound healing owing to the diverse reactive species it generates. Yet, the spatial delivery behavior of reactive species under the modulation of wound tissue remains poorly understood, thereby limiting precise and effective clinical applications. In this study, the mechanism by which the relative permittivity of tissues during wound healing affects the density and distribution of reactive species, a key determinant of He-APPJ performance, was systematically discussed. Results indicate that […]
- by Shenli Jia, Liang Zhang, Guitian Lan and Longwen WuAlumina is essential in state-of-the-art power and electronic systems due to its excellent electrical insulation, thermal conductivity, mechanical strength, and aging resistance. However, the surface flashover performance of alumina is limited by its easy surface charge accumulation and high secondary electron yield (SEY), which has become a stumbling block that hinders the miniaturization and lightweight development of high-voltage and high-power applications. To address this problem, a series of semiconductive glazes based on lead ruthenate (PbRuO3) conductive phase and B–Si–Pb glass […]
- by Yang Zhao, Ximing Zhu, Liwei Zhou and Lu WangGliding arc air plasma exhibits significant application potential in energy, environmental protection, and other fields due to its non-equilibrium characteristics (high electron temperature and high concentration of reactive species). However, the spatial distribution characteristics of its electron temperature and electron density play a crucial role in determining plasma chemical efficiency. In this study, a multi-spectral imaging method combined with a collisional-radiative model was employed to conduct high-resolution spatial distribution diagnosis of the high-energy electron temperature and electron density of air […]
- by Qian Li, Shumeng Yan, Jianxun Liu, Yu Zhou, Xiujian S un, Hongwei Gao, Xin Chen, Wenwen Li, Yaozong Zhong, Qian Sun and Hui YangGaN-based heterojunction bipolar transistors (HBTs) have great potential in the fields of radio frequency power amplifier and power switching applications. However, the surface etching damage of p-type base layer has posed significant challenges to implementing ohmic contact and low resistance, which is the major bottleneck in improving the current drive capability of GaN-based HBTs. In this work, n-AlGaN/p-InGaN/n-GaN double HBTs (DHBTs) featured with ultralow specific on-resistance and high output current density were successfully fabricated. To reduce the base resistance and […]
- by Rongxin Li, Sushmita Chandra, Changjiang Yi and Claudia FelserOngoing advancements in industrial modernization and informatization have greatly increased the demand for multifunctional devices that integrate mechanical, electrical, magnetic, and optical functionalities. As a fundamental building block, field effect transistors (FETs) play a central role in the research and development of such multifunctional systems. However, conventional silicon–based FETs are now approaching their quantum physical limits and face limitations due to their rigidity, which restricts their adaptability across diverse application scenarios. In recent decades, two-dimensional (2D) materials have offered a […]
- by Jun He, Jin Huang, Yongjin Tang, Yang Li, Yong Yao and Shuoqing YanHigh Curie temperature (Tc) flaky FeCo alloys with high dielectric and magnetic losses have great potential applications for preparing high-temperature (
- by Min Liu, Ziyin Xu and Zhengyong SongVortex beams (VBs) hold substantial importance within the realms of optics and photonics. Currently, while numerous studies have focused on generating VBs using metasurfaces, most schemes are restricted to static modulation. Vanadium dioxide (VO2) exhibits significant insulator–metal transition properties, and its physical properties change under specific temperature or external stimuli. VO2 is an ideal candidate for designing dynamic metasurfaces and is expected to break through the static limitations of existing VB generation techniques. In this study, we propose an innovative […]
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