Article
Engineering, Mechanical
Alireza Mojahed, Kosmas L. Tsakmakidis, Lawrence A. Bergman, Alexander F. Vakakis
Summary: The classical time-bandwidth limit suggests it is impossible to store broadband waves for long times. However, recent studies have shown that this limit may be surpassed in nonlinear systems. This research presents a structure that allows for energy-tunable control of nonlinear energy flow in the frequency domain, enabling the storage of broadband waves for long durations.
NONLINEAR DYNAMICS
(2022)
Article
Optics
Rui Zhu, Mei Xu, Quanhua Liu, Bin Wang, Weifeng Zhang
Summary: In this paper, a method for generating flexible ultra-wide LCMWs based on FDML-OEO and DP-QPSK modulator is proposed and experimentally demonstrated. Results show that LCMWs with a maximum bandwidth of 10.8 GHz can be generated with a wide tuning range in center frequency and bandwidth. By controlling the bias conditions, dual-band LCMWs can also be generated.
Article
Multidisciplinary Sciences
Huolei Feng, Xingwei Zhang, Yuekai Zhang, Limin Zhou, Yushan Ni
Summary: The designed confocal elliptical core-shell structure can achieve omnidirectional camouflage effect without affecting temperature and electric potential profiles. The composite structure proposed in the study successfully eliminates scattering caused by the elliptical core under different directions, demonstrating omnidirectional thermal-electric camouflage effect experimentally.
Article
Materials Science, Multidisciplinary
Hong-Tao Zhou, Wen-Xiao Fu, Yan-Feng Wang, Yue-Sheng Wang, Vincent Laude, Chuanzeng Zhang
Summary: This study introduces a systematic approach to designing ultra-broadband passive metasurfaces by combining broad-band local reflection rules with optimization methods. Experimental results show that the relative bandwidth can exceed 93.33%, higher than previous passive metasurfaces, demonstrating excellent time-domain broadband characteristics.
MATERIALS & DESIGN
(2021)
Article
Optics
Ibrahim Nasidi, Ran Hao, SangZhong Jin, Erping LI
Summary: In this paper, we use automatic differentiation to inversely optimize the dispersion band of a photonic moire lattice waveguide, achieving a waveguide that supports a slow light mode for buffering. The optimized structure outperforms conventional and deep learning methods in terms of group index, bandwidth, and normalized-delay-bandwidth-product.
Article
Optics
Yaqing Pang, Zhi Liu, Yupeng Zhu, Xiangquan Liu, Diandian Zhang, Chaoqun Niu, Mingming Li, Jun Zheng, Yuhua Zuo, Buwen Cheng
Summary: The study demonstrates a high-performance waveguide-coupled lateral avalanche photodetector (APD) without the need for silicon epitaxy and charge layer ion implantation, showing outstanding performance at a wavelength of 1550 nm with great potential in high-speed optical transceivers for optical links.
Article
Mechanics
Haixiang Pang, Aichun Feng, Yunxiang You, Ke Chen
Summary: The article introduces a novel energy harvesting device designed based on water field manipulation theory, which can efficiently and flexibly harvest kinetic energy. The research demonstrates the potential to harvest low-speed water flow energy at an effective level.
Article
Physics, Multidisciplinary
Zonggang He, Kun Yuan, Guohuan Xiong, Jian Wang
Summary: Thermal metamaterials offer a promising avenue for creating artificial materials with unconventional physical properties. We propose an evolutionary framework for designing thermal metamaterials using genetic algorithm optimization, and fabricate functional thermal units through 3D printing to verify their thermal illusion performance.
CHINESE PHYSICS LETTERS
(2023)
Article
Mathematics, Applied
Yun-Xiang Li, Si-Ao Xu, Hongbo Hua, Xiang-Feng Pan
Summary: The paper investigates the resistance diameters of P-n square P-m and P-n[P-m]. Additionally, it provides the maximal resistance distance among some pairs of vertices in the lexicographic product of connected graph and orderable graph.
JOURNAL OF APPLIED MATHEMATICS AND COMPUTING
(2022)
Article
Optics
Shuna Yang, Wenjie Zhu, Hao Chi, Bo Yang, Jun Ou, Yanrong Zhai
Summary: A photonic approach is proposed for generating dual-band dual-chirp waveforms with anti-dispersion transmission. The approach utilizes an integrated dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM) for single-sideband modulation of RF input and double-sideband modulation of baseband signal-chirped RF signals. The system demonstrates a simple architecture, excellent reconfigurability, and immunity to dispersion-induced power fading.
Article
Optics
Yuluan Xiang, Hengzhen Cao, Chaoyue Liu, Daoxin Dai
Summary: In this study, a high-performance waveguide Ge/Si avalanche photodiode operating at the O-band (1310 nm) is designed and fabricated. The device shows excellent responsivity, bandwidth, and low dark current, making it suitable for future high-speed data transmission systems.
Article
Optics
Yiwei Liu, Hao Chen, Qiuya Sun, Zhuqing Jiang
Summary: We propose a method for the removal of the zero-order term by subtracting two off-axis holograms based on a reference wave polarization adjustment. The expression of the zero-order elimination hologram is derived from the essential formula of holographic recording, which proves the validity of this method. Experimental results demonstrate that imaging reconstruction from the zero-order elimination hologram achieves higher resolution than conventional reconstruction.
Article
Optics
Bassem Tossoun, Geza Kurczveil, Sudharsanan Srinivasan, Antoine Descos, Di Liang, Raymond G. Beausoleil
Summary: A GaAs-based quantum dot avalanche photodiode (APD) on silicon with low dark current, high bandwidth, and record gain-bandwidth product was reported. The device also showed potential for integration into a wavelength division multiplexing system for high-speed reception.
Article
Instruments & Instrumentation
Liqi Zhu, Huijun Guo, Zhiqi Zhou, Zhiyang Xie, Hao Xie, Lu Chen, Chun Lin, Baile Chen
Summary: This study investigates the frequency response of MWIR HgCdTe APDs and proposes an upside-down structure to improve the bandwidth. The device exhibits low dark current, high gain, and low excess noise, with a high responsivity at 4.5 μm wavelength. The results indicate potential applications in free-space optical communication and other emerging areas.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Pietro Burrascano
Summary: Modeling the nonlinearity of a system is crucial for optimizing its design and controlling its behavior. The identification of nonlinear models must be accurate and computationally efficient for practical use. The Hammerstein model, based on pulse compression, has been widely applied due to its accurate identification in various applications. This paper focuses on the adequacy of the frequency range for filter identification and proposes criteria for maximizing accuracy in model identification.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Yue Li, Xinlin Geng, Xianghong Kong, Xingsi Liu, Zhen Liu, Zheng Wang, Difei Liang, Qian Xie, Jianliang Xie, Longjiang Deng, Cheng-Wei Qiu, Bo Peng
Summary: This article reports a dynamic beam steering system with periodic grating nanostructures fabricated through nanoimprint lithography, achieving high-frequency, wide field of view control of light beams for efficient 3D space data acquisition, suitable for next-generation intelligent vision and self-driving technologies.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Ruisheng Yang, Yuancheng Fan, Wei Zhu, Chuanjie Hu, Songnan Chen, Heng Wei, Weijin Chen, C. T. Chan, Qian Zhao, Ji Zhou, Fuli Zhang, Cheng-Wei Qiu
Summary: Optical wavefront engineering is essential for the development of next-generation integrated photonic devices. Recent advances in metagratings have provided an efficient solution for beam steering without the need for phase modulation or impedance profiles. All-dielectric metagratings fabricated with a complex lattice structure demonstrate unitary diffraction efficiency in anomalous terahertz beam reflections, making them promising for high-performance functional devices.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Zheng Zhang, Wei Xiang Jiang, Xin Ge Zhang, Wen Kang Cao, Lin Bai, Cheng-Wei Qiu, Tie Jun Cui
Summary: In this study, an acoustic full-space digital metasurface consisting of arrays of dual-channel elements with variable coding states is proposed and experimentally demonstrated. The reflected and transmitted sound waves can be independently and dynamically controlled. The presented element achieves high efficiency (up to 80% in transmission mode and nearly 100% in reflection mode) and enables decoupled modulations of the reflection and transmission coefficients. Tunable beam deflection and alterable wave focusing are experimentally validated without inter-modal crosstalk on both sides of the platform.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Yang Chen, Jiangang Feng, Yuqing Huang, Weijin Chen, Rui Su, Sanjib Ghosh, Yi Hou, Qihua Xiong, Cheng-Wei Qiu
Summary: This study demonstrates the realization of compact spin-valley-locked perovskite emitting metasurfaces with pure circular polarization, high directionality, and large emission angles by imparting spin-dependent geometric phases through Brillouin zone folding.
Article
Nanoscience & Nanotechnology
Hongtao Wang, Hao Wang, Qifeng Ruan, John You En Chan, Wang Zhang, Hailong Liu, Soroosh Daqiqeh Rezaei, Jonathan Trisno, Cheng-Wei Qiu, Min Gu, Joel K. W. Yang
Summary: By miniaturizing spiral phase plates and integrating them with structural colour filters, we have successfully generated coloured orbital angular momentum beams using incoherent white light. These beams, which possess both spatial and temporal coherence, can independently generate multiple helical eigenstates and combine colour information into orbital angular momentum beams.
NATURE NANOTECHNOLOGY
(2023)
Article
Optics
Haoye Qin, Zengping Su, Mengqi Liu, Yixuan Zeng, Man-Chung Tang, Mengyao Li, Yuzhi Shi, Wei Huang, Cheng-Wei Qiu, Qinghua Song
Summary: Breaking the symmetry of photonic crystal slabs (PhCSs) can realize upward and downward asymmetry and arbitrarily polarized bound states in the continuum (BIC) by using a bilayer-twisted PhCS. This structure exhibits elliptical polarization states with constant ellipticity angle within the vicinity of BIC. The topological nature of BIC is reflected in the orientation angle of polarization state, with a topological charge of 1 for any value of ellipticity angle. Full coverage of Poincare sphere and higher-order Poincare sphere can be achieved by tailoring the twist angles. These findings may have applications in structured light, quantum optics, and twistronics for photons.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
He-Xiu Xu, Guangwei Hu, Xianghong Kong, Yanzhang Shao, Patrice Genevet, Cheng-Wei Qiu
Summary: Electromagnetic wave multiplexing, especially for spatial-frequency multiplexing, is important for ultrathin multifunctional interfaces and high-capacity information processing and communication. However, it is challenging to achieve with passive and compact wave elements due to the exclusive coupling between wave excitation and scattering channels. In this study, a spin-momentum multiplexed paradigm called a super-reflector is proposed, enabling control of both retroreflections and anomalous reflections. By multiplexing four channels connecting two spin states and three spatial frequencies, a total of twelve channels are engineered, with five degrees of freedom in circular polarization Jones' matrix. Experimental verification has been conducted, showcasing twelve reflected beams with high efficiency exceeding 90.6%. This strategy opens up possibilities for angle multiplexing and angle-resolved metadevices.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Zifu Xu, Ying Li, Gang Gao, Fei Xie, Ran Ju, Shimin Yu, Kaipeng Liu, Jiaxin Li, Wuyi Wang, Wei Li, Tianlong Li, Cheng-Wei Qiu
Summary: In this study, a scalable selective absorber with a quasiperiodic nanostructure composed of densely arranged Fe3O4 nanoparticles was reported for high-performance energy conversion of low-grade solar energy. By investigating the scale effect of the quasiperiodic densely arranged plasmonic nanostructure, a significant solar absorption rate of over 94% and ideal passive suppression of thermal emissivity below 0.2 were achieved simultaneously. A flexible planar solar thermoelectric harvester was demonstrated, reaching a significant sustaining open-circuit voltage of over 20 mV/cm(2) under natural sunlight (AM1.5G), without a heat sink. This highly versatile strategy is expected to lead the exploration of energy evolution in fundamental research and pioneer next-generation, high-performance, economical, and practical solar co-harvesting systems.
Article
Plant Sciences
Yi Wu, Fangbin Cao, Lupeng Xie, Feibo Wu, Shenlong Zhu, Chengwei Qiu
Summary: Aluminum toxicity is a major constraint to crop production in acidic soils. This study investigated the changes in miRNA expression in the roots of two olive genotypes with contrasting aluminum tolerance. A total of 352 miRNAs were discovered, and 11 miRNAs showed significantly different expression patterns between the tolerant and sensitive genotypes under aluminum stress. In silico prediction identified potential target genes involved in transcriptional regulation, hormone signaling, transportation, and metabolism. These findings provide new insights into the regulatory roles of miRNAs in enhancing aluminum tolerance in olives.
Article
Chemistry, Physical
Jinni Shen, Xu Liu, Yuhua Zhong, Chengwei Qiu, Huihui Xu, Hongsheng He, Haifeng Li, Jianhan Lin, Zizhong Zhang, Xuxu Wang
Summary: Solar light-driven overall water splitting for hydrogen production is an ideal solution to climate warming and energy shortage issues. Obtaining a highly efficient and stable photocatalyst remains a major challenge at present. Herein, NixP/gamma-Ga2O3 nanosheets are found to be a highly active and durable photocatalyst for pure water splitting into H2 and O2 without a sacrificial reagent.
ACS APPLIED ENERGY MATERIALS
(2023)
Editorial Material
Multidisciplinary Sciences
Yucheng Jiang, Yangliu Wu, Jinlei Zhang, Jingxuan Wei, Bo Peng, Cheng-Wei Qiu
Article
Multidisciplinary Sciences
Jiangang Feng, Xi Wang, Jia Li, Haoming Liang, Wen Wen, Ezra Alvianto, Cheng-Wei Qiu, Rui Su, Yi Hou
Summary: Tuning the composition of perovskites to approach the ideal bandgap has raised the efficiency limit of solar cells. Narrow-bandgap perovskite solar cells have achieved efficiencies of up to 26.1%. However, there is currently a limit to how much the composition can be further engineered.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Multidisciplinary Sciences
Jingjing Liu, Wei Wang, Chengyu Zhao, Yongqiang Zhou, Han Zhang, Bin Liang, Cheng-Wei Qiu, Jian-Chun Cheng
Article
Materials Science, Multidisciplinary
Mengqi Liu, Weijin Chen, Guangwei Hu, Shanhui Fan, Demetrios N. Christodoulides, Changying Zhao, Cheng-Wei Qiu
Summary: Perfect absorbers that can completely absorb all incoming energy have been extensively studied and found to be associated with topological spectral phase singularities (SPS). The order of the topological invariant depends on the number of degenerate outgoing channels. By examining mirror-backed and all-dielectric structures, the generation, evolution, and annihilation of SPSs with different orders are revealed. A strategy based on charge conservation of SPSs has been established to design dual-band perfect absorbers. These findings highlight the topological origin of perfect absorption and its potential applications in biosensing, topological metasurfaces, and micro/nano thermal radiation.
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)
