- by Hong Li, Qiao Wang, Qibing Li, Kai Zhang, Enen Li, Hongbo Li, Guangyou Fang, Yirong Wu, Ping-An Hu and Tianwu WangThe terahertz spectra and terahertz emission characteristics of Gallium telluride (GaTe) as a function of temperature were studied by terahertz spectroscopy system, including terahertz time-domain spectroscopy, optical pump-terahertz probe spectroscopy and terahertz emission spectroscopy. The temperature range is 20 K–300 K. The temperature-dependence terahertz transmittance and dielectric properties, photocarrier recombination dynamics and terahertz radiation properties of GaTe are analyzed. As the temperature increases, thermal expansion and lattice vibration intensify, resulting in accelerated phonon scattering and reduced relaxation time. Meanwhile, due […]
- by Ying-Shuang Liang, Peng-Bo Li, Yu-Ru Zhang and You-Nian WangIn this paper, a fluid model is performed to investigate the effect of a structured electrode on capacitively coupled helium discharges operated at 13.56 MHz with 100 V peak-to-peak voltage, and 200 Pa. Compared to discharges with conventional planar electrodes, it is found that the plasma density produced by the structured electrode is raised by 28.5%–161.2% from as the trench size (i.e. width and depth) in structured electrode varies. The results also indicate that the trench dimensions have a great […]
- by Guanliang Yu, Chun Jiang and Yigui LiContactless tuning of signals represents a promising avenue for advancing topological phononics and photonics devices, particularly in the frequency and spatial domains. For topological phase transitions, breaking the spatial inversion symmetry geometrically to obtain an open topological band gap is a typical way to introduce perturbations. This approach has great limitations in achieving reconfigurable topological protection routes. We present a thermally modulated two-dimensional elastic topological insulator made from a patterned substrate and a temperature-sensitive vanadium dioxide film, allowing elastic waves […]
- by Inam Mirza, Juraj Sládek, Yoann Levy, Alexander V Bulgakov, Vasilis Dimitriou, Helen Papadaki, Evaggelos Kaselouris, Paulius GeÄŤys, Gediminas RaÄŤiukaitis and Nadezhda M BulgakovaUsing different laser irradiation patterns to modify the silicon surface, it has been demonstrated that, at rather small overlapping between irradiation spots, highly regular laser-induced periodic surface structures (LIPSS) can be produced already starting from the second laser pulse, provided that polarization direction coincides with the scanning direction. If the laser irradiation spot is shifted from the previous one perpendicular to light polarization, LIPSS are not formed even after many pulses. This coherence effect is explained by a three-wave interference, […]
- by Pepijn Heirman and Annemie BogaertsSeveral computational models have been developed over the past decade with the goal to investigate the various processes that occur during plasma–liquid interaction. However, many different boundary conditions to describe transfer of chemical species over the gas–liquid interface have been reported in these investigations. In this work, we employ a computational model to test these various boundary conditions, and compare the results to experimental data for H2O2, O3, ·NO and HNO2, in order to assess how well these boundary conditions […]
- by Mohsin Shah, Yixuan Wu, Shulei Chen, James L Mead, Lizhen Hou, Kun Liu, Shaohua Tao, Sergej Fatikow and Shiliang WangThis review discusses the transformative impact of micro/nano particle manipulation techniques across scientific and technological disciplines. Emphasizing the pivotal role of precise control at the micro and nanoscale, the paper categorizes manipulation strategies into mechanical/surface force-based, field-control manipulation, and microfluidics manipulation. It addresses challenges specific to the submicrometer scale, highlighting the strengths and limitations of each approach. The unique behaviors exhibited by objects at the micro–nano scale influence the design and operation of manipulators, algorithms, and control systems, particularly in […]
- by Shuo Yang, Peixin Yu, Binyu Wu, Xiaolu Ge, Chidao Chen, Zhongsheng Man and Liping ZhangThis paper introduces a novel type of abrupt autofocusing beam called the circular Pearcey Airyprime beam (CPApB). Theoretical investigations and experimental verification of the propagation dynamics of the CPApB are conducted. Our results indicate that the focusing intensity of the CPApB is significantly higher than that of the circular Pearcey Airy beam (CPAB), reaching about twice that of the CPAB. Therefore, the CPApB exhibits superior autofocusing capability compared to the CPAB under identical conditions. Furthermore, the influence of different decay […]
- by Sijie Yang, Wenjuan Liu, Zhiwei Wen, Ying Xie, Xin Tong, Yan Liu, Yao Cai, Shishang Guo and Chengliang SunLaterally excited bulk wave resonators demonstrate outstanding electromechanical coupling coefficient (Keff2) suitable for the design of wideband filters. However, it has not been commercialized due to the spurious modes and low temperature coefficient of frequency (TCF). In this paper, a near spurious-free 6 GHz resonator (SW-BAR) is proposed with single-sided wavy edges in the aperture direction. The SW-BAR suppress high-order harmonics in the area of the electrodes by confining the formation of standing waves. The design is fabricated using a […]
- by Xianzhe Li, Tao Li, Jun Wan, Bin Zhang, Qirong Huang, Xinyu Yang, Lie Feng, Kaiqing Zhang, Wei Huang and Haixiao DengTerahertz (THz) imaging holds increasing importance across various scientific fields and practical applications due to its unique characteristics. However, achieving high sensitivity and high frame rates simultaneously remains a major challenge for most current THz imaging techniques. In this paper, we demonstrate an improved THz imaging system based on Rydberg-atom vapor, which converts THz waves into visible fluorescence. A high-sensitivity camera and a high-speed camera are used simultaneously to capture the visible fluorescence. Specifically, for a 0.55 THz source, a […]
- A flexible lightweight graphene-based all-dielectric metamaterial for broadband microwave absorptionby Haiyan Zhuang, Mengchao Guo, Jingjing Wang, Xiaokun Wang, Jiafu Wang, Shaobo Qu, Dongming Tang, Baoshan Zhang and Yi YangTo meet the demanding requirements of practical microwave absorbers, such as broadband absorption, considerations must encompass thickness, flexibility, surface density, and manufacturing feasibility. However, absorbers that effectively address all of these aspects are currently scarce. This study introduces a novel graphene-based all-dielectric metamaterial absorber (ADMMA) featuring a trap-like structure, inspired by impedance alternation strategy. Leveraging the dielectric dispersion properties of graphene composites, this ADMMA strategically manipulates the effects of Spoof Surface Plasmon Polaritons, standing wave resonance and half-wave dipole resonance, […]
- by Yanan Wang, Peng Wang, Kehui Zhou, Liyun Jin, Anbang Sun, Weidong Ding, Bo Wang, Ruoyu Han and Jiaqi YanThe micro-cathode arc thruster is a promising micro-propulsion technology. However, the short service life of the conductive film-triggering units is one of the important factors limited its application. In this study, a novel semiconductor surface flashover (SSF) ignition method is proposed aiming at extending the ignition lifespan. Owing to the inherently different triggering mechanisms and physical processes, the SSF ignition system does not require a balance between ablation and re-deposition processes, which could potentially improve the reliability of the triggering […]
- by Youya Liu, Dapeng Jiang, Yang Fu, Xiaofeng Zhou, Fan Ding and Helin YangThis paper proposes a single layer 1-bit linear polarization converter for reducing the ultra-wideband radar cross section (RCS) of both planar and conformal surfaces. The layout of the supercells was optimized using the simulated annealing algorithm, achieving an average RCS reduction of over 10 dB in the range of 6.39–18.1 GHz in the planar case. By conforming the metasurface with cylinders of different radius of curvature, the result still meets the requirement of a 10 dB reduction within the bandwidth, […]
- by Huihui Yan, Haiqing Liu, Shouxin Wang, Xuechao Wei, Yuan Yao, Yao Zhang, Ximo Peng, Hui Lian, Weiming Li, Yinxian Jie, Jun Jiang and Yaoling TianA vertical single-channel 0.65 THz solid-source interferometer (SSI) has been established at Experimental Advanced Superconducting Tokamak (EAST) for real-time electron density measurements and feedback. A line array detection scheme was proposed and successfully deployed on EAST to enhance the spatial resolution of the SSI system. The scheme utilizes an AlGaN/GaN line array high electron mobility transistor detector, and three channels of line-integrated electron density signals were measured. A representative density measurement was conducted with an intermediate frequency of 850 kHz […]
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