Article
Optics
Brian Slovick, Josh Hellhake
Summary: We proposed an optimization method for designing unidirectional invisibility cloaks by minimizing the forward scattering amplitude of the cloaked object. The use of the optical theorem simplifies the evaluation and integration of the scattering amplitude, making the optimization process computationally efficient. Several gradient-permittivity unidirectional cloaks were successfully designed to reduce scattering from metallic targets of varying sizes and shapes.
PHOTONICS RESEARCH
(2022)
Article
Multidisciplinary Sciences
Jun Cao, Fenghua Qi, Senlin Yan
Summary: Transformation acoustics provides a powerful tool for designing acoustic devices with excellent functionalities. This letter proposes a coordinate transformation methodology for achieving simplified parameters in the design of acoustic devices, leading to good performance in numerical simulations. The method opens up more opportunities for experimental realization of designed acoustic devices and can also be applied to 3D transformation-acoustic designs.
SCIENTIFIC REPORTS
(2021)
Article
Mathematics, Applied
Bo Wang, Zhiguo Yang, Li-Lian Wang, Shidong Jiang
Summary: This paper presents analytic formulas for temporal convolution kernel functions in non-reflecting boundary conditions for electromagnetic scattering problems, leading to efficient algorithms and accurate computations. It also introduces a new time-domain model for an electromagnetic invisibility cloak, optimizing accuracy and computational cost compared to existing models. The proposed method for simulating a spherical invisibility cloak demonstrates significant savings in computational time.
JOURNAL OF SCIENTIFIC COMPUTING
(2021)
Article
Physics, Multidisciplinary
Saeed Hasanpour Tadi, Babak Shokri
Summary: This article introduces a new strategy for double invisibility cloaking based on electromagnetic and acoustic transformation theory. By combining four conventional cloaking methods, objects can be made undetectable acoustically and electromagnetically simultaneously.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Materials Science, Multidisciplinary
Tommy Tai, Ching Hua Lee
Summary: This paper investigates the semiclassical optical response of two nodal loops in linked, unlinked, and touching configurations. A geometric picture is provided to unify the aspects of nodal topology and geometry, shedding light on the effects of nodal topology and geometry on material properties.
Article
Physics, Multidisciplinary
Zhenzhen Chen, Huayong Zhang, Xianliang Wu, ZhiXiang Huang
Summary: Based on the expansions of electromagnetic fields, the reflection and refraction of an electromagnetic beam by a uniaxial anisotropic slab are analyzed. The unknown expansion coefficients are determined using a system of linear equations derived from the boundary conditions. The normalized field intensity distributions for Gaussian and Hermite-Gaussian beams are evaluated and the propagation features are briefly discussed.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Ruiyou Li, Huaiqing Zhang, Shiqi Gao, Zhao Wu, Chunxian Guo
Summary: The F-ELM algorithm, based on fractal dimension technology, improves the computing speed and stability of transient electromagnetic method inversion. It reduces computing time compared to ordinary ELM algorithms, enhances inversion accuracy, and is proven to be an effective technique for TEM inversion.
COMPUTERS & GEOSCIENCES
(2021)
Article
Chemistry, Inorganic & Nuclear
Yubin Liu, Xiaoyang Pan, Wenjie Chen, Xiaojing Zhao
Summary: In this study, Nb-doped TiO2 nanoparticles were successfully synthesized using a facile method and characterized by various techniques. The results showed that the Nb-doped TiO2 exhibited improved lithium-ion storage properties in lithium-ion batteries, which may be attributed to the enhanced conductivity due to Nb doping.
DALTON TRANSACTIONS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Saeid Jamilan, Elena Semouchkina
Summary: Using the phenomenon of self-collimation in photonic crystals, the performance of invisibility cloaks made of dielectric rod arrays can be enhanced. By incorporating circular SC sections and TO-based transition sections in the cloak design, wave paths can be effectively controlled to reduce wave scattering and restore the original wavefront behind the hidden object.
METAMATERIALS XIII
(2021)
Article
Mechanics
Ke-Fan Xu, Ye-Wei Zhang, Mu-Qing Niu, Jian Zang, Jian Xue, Li-Qun Chen
Summary: A improved nonlinear energy sink is proposed in this work by integrating with an electromagnetic system, which achieves vibration reduction and energy harvesting at the same time while retaining the targeted energy transfer characteristic.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Chein-Shan Liu, Essam R. El-Zahar, Yung-Wei Chen
Summary: This study introduces a novel splitting and linearizing technique (NSLT) for solving nonlinear elliptic equations in arbitrary plane domains. By splitting and handling the nonlinear term, combined with multiple-scale technique, the method converges rapidly and obtains accurate numerical solutions.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Engineering, Electrical & Electronic
Xiaoer Wu, Jinbiao Xiao
Summary: A novel improved full-vectorial meshfree finite cloud mode solver is proposed for the analysis of step-index optical waveguides with arbitrary interfaces. By introducing local coordinate transformations and a curvilinear mapping technique, the solver is capable of dealing with tilted and curved interfaces. The kernel shape function is modified to enforce the Kronecker delta property, significantly improving computational efficiency. The proposed solver also improves computational accuracy by carefully treating field values near material interfaces.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Shichang Liu, Quanfeng Li, Xuanyu Hong, Yahui Zuo, Dingjiang Zou
Summary: In this paper, a new vector control strategy is proposed to effectively suppress the electromagnetic vibration generated by a permanent magnet motor at different frequency bands. The speed controller and current controller of the traditional vector control system of a permanent magnet synchronous motor (PMSM) are improved by means of an active disturbance rejection controller (ADRC) and a super-twisting sliding mode controller (STSMC). The superiority of the improved PMSM vector control system in terms of the comprehensive control performance and electromagnetic vibration is verified by multi-physics coupled finite element simulations.
JOURNAL OF POWER ELECTRONICS
(2023)
Article
Optics
F. G. Mitri
Summary: This study presents the generalized expressions of scattering asymmetry parameters for a dielectric cylinder under light-sheet illumination, both along and perpendicular to the direction of the incident radiation. The numerical results demonstrate the role of these parameters in various applications.
Article
Engineering, Electrical & Electronic
Xueyi Zhang, Changhui Quan, Zhongqi Li
Summary: This article investigates the calculation of mutual inductance between two circular coils on a double-layer EM shielding, and validates the analytical calculations through a series of experiments. The theoretical results are in good agreement with the experimental data and FEM simulation results.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2021)
Article
Plant Sciences
Xue-Yi Zhou, Nian-Hong Wang, Cheng-Wei Qiu, Liming Luo, Mian Zhang, Shuo Zhang, Zi-Feng Gao, Imrul Mosaddek Ahmed, Feibo Wu
Summary: Cadmium (Cd) is a harmful heavy metal contaminant, and long non-coding RNAs (lncRNAs) play significant roles in plant response to Cd stress. Transcriptome analysis of Cd-tolerant and Cd-sensitive barley genotypes revealed novel lncRNAs and differentially expressed lncRNAs between the two genotypes. Prediction and experimental analysis showed that some lncRNAs may act as target mimics of miRNAs in barley. Functional analysis of a key lncRNA demonstrated its important role in plant Cd tolerance.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2023)
Article
Multidisciplinary Sciences
Yang Chen, Huachun Deng, Xinbo Sha, Weijin Chen, Ruize Wang, Yu-Hang Chen, Dong Wu, Jiaru Chu, Yuri S. S. Kivshar, Shumin Xiao, Cheng-Wei Qiu
Summary: Photons with spin angular momentum possess intrinsic chirality, which has a wide range of applications. Current experimental attempts rely on false/extrinsic chirality, but this study has achieved true/intrinsic chiral response using resonant metasurfaces, achieving near-unity circular dichroism and a high quality factor for visible frequencies.
Article
Multidisciplinary Sciences
Qiangbing Guo, Xiao-Zhuo Qi, Lishu Zhang, Meng Gao, Sanlue Hu, Wenju Zhou, Wenjie Zang, Xiaoxu Zhao, Junyong Wang, Bingmin Yan, Mingquan Xu, Yun-Kun Wu, Goki Eda, Zewen Xiao, Shengyuan A. Yang, Huiyang Gou, Yuan Ping Feng, Guang-Can Guo, Wu Zhou, Xi-Feng Ren, Cheng-Wei Qiu, Stephen J. Pennycook, Andrew T. S. Wee
Summary: A van der Waals crystal, niobium oxide dichloride (NbOCl2), has been found to exhibit weakened interlayer electronic coupling and monolayer-like excitonic behavior in the bulk form. It also has a scalable second-harmonic generation intensity that is three orders higher than that in monolayer WS2. Additionally, the strong second-order nonlinearity in thin flakes as thin as 46 nm enables correlated parametric photon pair generation through a spontaneous parametric down-conversion (SPDC) process. This is the first SPDC source demonstrated in two-dimensional layered materials and the thinnest SPDC source ever reported. This research opens avenues for developing van der Waals material-based ultracompact on-chip SPDC sources and high-performance photon modulators in both classical and quantum optical technologies.
Article
Nanoscience & Nanotechnology
Guangwei Hu, Weiliang Ma, Debo Hu, Jing Wu, Chunqi Zheng, Kaipeng Liu, Xudong Zhang, Xiang Ni, Jianing Chen, Xinliang Zhang, Qing Dai, Joshua D. Caldwell, Alexander Paarmann, Andrea Alu, Peining Li, Cheng-Wei Qiu
Summary: Various optical crystals with opposite permittivity components have been observed and characterized in the mid-infrared regime. These crystals possess hyperbolic polaritons with large-momenta optical modes and wave confinement, making them promising for nanophotonic on-chip technologies. Monoclinic CdWO4 crystals are shown to exhibit symmetry-broken hyperbolic phonon polaritons and offer new opportunities for polaritonic phenomena.
NATURE NANOTECHNOLOGY
(2023)
Article
Optics
Tao Zhao, Peiyao Xie, Hujie Wan, Tianpeng Ding, Mengqi Liu, Jinlin Xie, Enen Li, Xuequan Chen, Tianwu Wang, Qing Zhang, Yanyu Wei, Yubin Gong, Qiye Wen, Min Hu, Cheng-Wei Qiu, Xu Xiao
Summary: This study demonstrates the potential of MXene materials to achieve the intrinsic thin-film absorption limit across the entire 0.5-10 THz band, which is crucial for high-performance terahertz detectors in various fields such as wireless communications, astronomy, security screening, and medical imaging.
Article
Physics, Multidisciplinary
Jinsheng Lu, Vincent Ginis, Cheng-Wei Qiu, Federico Capasso
Summary: Spin-orbit interactions in evanescent fields have attracted significant interest, particularly in relation to the generation of polarization-dependent lateral forces on particles. However, the relationship between polarization-dependent resonances of large particles and incident light's helicity and resultant lateral forces remains unclear. In this study, a microfiber-microcavity system was used to investigate these phenomena. Contrary to previous studies, it was found that induced lateral forces at resonance are not proportional to the helicity of incident light due to polarization-dependent coupling phases and resonance phases. A generalized law for optical lateral forces was proposed, revealing the existence of optical lateral forces even when the helicity of incident light is zero.
PHYSICAL REVIEW LETTERS
(2023)
Article
Plant Sciences
Pengfei Hao, Chengwei Qiu, Yi Wu, Wenxing Liu, Eva Vincze, Feibo Wu, Shuijin Hua
Summary: Comparing the leaf metabolome and transcriptome of tomato plants grown under SCP, chemical fertilizer, and organic fertilizer, it was found that SCP treatment improved primary and secondary metabolism in tomato leaves, promoted growth, and reduced environmental emissions. SCP also down-regulated ethylene-related genes, while up-regulating jasmonic acid and gibberellin related genes, leading to a balanced growth and environment adaptation ability in plants. This study provides insight into the molecular and metabolomic responses of tomato plants to SCP treatment, contributing to the development of climate-smart agriculture.
PLANT GROWTH REGULATION
(2023)
Article
Optics
Jin Chen, Feilong Yu, Xingsi Liu, Yanjun Bao, Rongsheng Chen, Zengyue Zhao, Jiuxu Wang, Xiuxia Wang, Wen Liu, Yuzhi Shi, Cheng-Wei Qiu, Xiaoshuang Chen, Wei Lu, Guanhai Li
Summary: A full-polarization metasurface is developed to overcome the polarization constraint in mid-infrared wavelengths, allowing for independent selection of orthogonal polarization at each wavelength. Experimental results show that the metasurface exhibits a detection sensitivity one order of magnitude higher than existing infrared detectors.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Physical
Mengqi Liu, Shuang Xia, Wenjian Wan, Jun Qin, Hua Li, Changying Zhao, Lei Bi, Cheng-Wei Qiu
Summary: Using doped InAs multilayers under moderate external magnetic fields with gradient epsilon-near-zero frequencies, broadband non-reciprocal absorption that can be tailored within the mid-infrared spectral region has been demonstrated. The study of magneto-optical absorption has stimulated diverse energy-technology-related explorations, showing potential in breaking the current theoretical efficiency limits of energy devices compared with reciprocal counterparts. However, experimentally realizing strong infrared non-reciprocal absorption remains an open challenge, and existing proposals of non-reciprocal absorbers are restricted to a narrow working waveband.
Article
Engineering, Multidisciplinary
Lin Bai, Yuan Ke Liu, Liang Xu, Zheng Zhang, Qiang Wang, Wei Xiang Jiang, Cheng-Wei Qiu, Tie Jun Cui
Summary: This work proposes and realizes a smart metasurface that utilizes human speech recognition for programming electromagnetic manipulations. The smart metasurface platform consists of a digital coding metasurface, a speech-recognition module, a single-chip computer, and a digital-to-analog converter circuit, and can intelligently control EM waves based on pre-stored voice commands. The constructed digital metasurface is composed of 6x6 super unit cells, each consisting of 4x4 active elements with embedded varactor diodes. The speech-recognition module, together with the DAC and single-chip computer, can recognize voice commands and generate corresponding voltage sequences to control the metasurface.
Article
Materials Science, Multidisciplinary
Haiyan Fan, He Gao, Tuo Liu, Shuowei An, Xianghong Kong, Guoqiang Xu, Jie Zhu, Cheng-Wei Qiu, Zhongqing Su
Summary: Non-Hermiticity in acoustic crystals leads to exotic topological phenomena and allows for manipulation of topological modes. Our work demonstrates an acoustic quadrupole topological insulator, offering a reconfigurable and versatile approach to manipulating topological phenomena.
Article
Materials Science, Multidisciplinary
Kaili Sun, Heng Wei, Weijin Chen, Yang Chen, Yangjian Cai, Cheng-Wei Qiu, Zhanghua Han
Summary: Leaky modes with high-Q can be achieved in compound lattices by introducing periodic perturbations. The double-band-folding strategy can lead to ultrahigh-Q leaky modes at any incident angles, providing a generalized recipe for various optical applications.
Article
Engineering, Electrical & Electronic
Xiaohu Chen, Lei Jin, Cong Chen, Simin Li, Jie Zhang, Pengjiu Zhao, Shoupeng Liu, Yong Liang, Xin Jin, Cheng-Wei Qiu, Hui Li
Summary: This article introduces a miniaturized metalens that can be used for monitoring brain activities of animals or endoscope diagnosis. The metalens is ultrathin and lightweight, offering a potential alternative to bulky refractive lenses. By utilizing the nonlinear properties of two-photon excitation, the metalens can focus at one wavelength and enable multichannel microscopy. The design process is simplified, manufacturing costs are reduced, and the metalens maintains a high transmittance for visible light. Experimental results demonstrate that the metalens enables two-photon biological imaging with subcellular resolution.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yuzhi Shi, Hong Luo, Sha Xiong, Tao He, Tongtong Zhu, Qinghua Song, Lei-Ming Zhou, Pin Chieh Wu, Zhanshan Wang, Cheng-Wei Qiu, Xinbin Cheng
Summary: Harnessing exotic optical forces can lead to various biophysical applications and novel light-matter interactions. This study presents a coordinated scheme to simultaneously utilize pulling force and lateral force, achieving a dynamically controlled 2D microvehicle. By leveraging the helicity-dependent features of these forces and adjusting the ellipticity of incident light, the ratio of both forces can be dynamically and arbitrarily controlled.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Environmental
Cheng-Wei Qiu, Yue Ma, Zi-Feng Gao, Jakkrit Sreesaeng, Shuo Zhang, Wenxing Liu, Imrul Mosaddek Ahmed, Shengguan Cai, Yizhou Wang, Guoping Zhang, Feibo Wu
Summary: This study provides a comprehensive examination of genetic variation in aluminum-tolerant Tibetan wild barley through genome-wide profiling. The identification of key genes related to aluminum tolerance in barley and the strategy of manipulating these genes offer potential for developing more aluminum-tolerant barley cultivars.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
