Article
Optics
Chao Wang, Yujia Li, Dongmei Huang, Hongjie Chen, Yihuan Shi, Feng Li
Summary: This study investigates the switching dynamics in bidirectional ultrafast fiber lasers and explores the evolution and output properties of asynchronous and synchronous bidirectional solitons. Stable breathing solitons in the synchronous operation exhibit contrasting behaviors, which are influenced by different pump powers.
Article
Optics
Yi Zhou, Yu-Xuan Ren, Jiawei Shi, Kenneth K. Y. Wong
Summary: This study reveals the nonequilibrium dynamics of a breathing soliton pair in a bidirectional fiber laser and observes the dynamics of optical rogue waves and breathing soliton molecules. These findings expand the understanding of multiple breather dynamics in nonlinear systems.
Article
Optics
Denghui Pan, Xuanyi Liu, Feng Ye, Qian Li, Hongyan Fu
Summary: This study focuses on the crucial area of research in mode-locked fiber lasers, which involves the formation of ultrashort pulses from noisy or unstable states. Investigating the complex nonlinear dynamics in these systems can provide valuable insights and new practical engineering techniques for optimizing optical systems. In our study, we used time-stretch dispersive Fourier transform to investigate the formation of dissipative solitons in a net-normal dispersion nonlinear polarization evolution mode-locked fiber laser, which allowed us to gain a better understanding of the intricate dynamics involved. By identifying five distinct transient stages in the formation process, including relaxation oscillation, modulation instability, spectral broadening, soliton explosions, and stable mode-locking, we were able to shed light on the underlying mechanisms of dissipative soliton formation. Additionally, we observed the generation of dissipative rogue waves during the soliton explosion stage.
Article
Engineering, Multidisciplinary
Yunsheng Jiang, Zhiqian Xu, Ping Wu, Liuhong Huang, Cui Meng
Summary: A time-domain calibration method for transient field sensors is proposed in this article, using TEM cells and monocone TEM cells as the calibration devices, divided into amplitude sensitivity and rising edge calibration. By introducing the process and presenting an example of calibrating a D-Dot sensor, the method is proven to be efficient and practical.
Article
Optics
Yulong Cao, Lei Gao, Stefan Wabnitz, Hongqing Ran, Lingdi Kong, Tao Zhu
Summary: This study investigates the spectral broadening and breathing behavior of transient dissipative structures produced asynchronously during the buildup process of dissipative solitons, revealing a novel dynamics of dissipative soliton generation including energy quantization, spectral broadening induced by self-phase modulation, structural dissipative soliton formation, and Raman soliton self-frequency shifting.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jonas Schmidt, Luis I. Domenianni, Marcel Leuschner, Andreas Gansaeuer, Peter Voehringer
Summary: Titanium-based catalysis in single electron transfer (SET) steps has been widely used for the synthesis of fine chemicals. In recent studies, it has been combined with photo-redox (PR) catalysis to enhance its sustainability. This research focuses on the photochemical principles of all-Ti-based SET-PR-catalysis without a precious metal PR-co-catalyst. The dynamics of critical events, such as singlet-triplet interconversion and one-electron reduction, were studied using time-resolved emission and UV/MIR spectroscopy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Management
Jose Correa, Dana Pizarro, Gustavo J. Vulcano
Summary: In this dynamic pricing problem, a firm aims to maximize expected revenue by selling one item to a buyer. The firm determines a price function over an infinite horizon. The buyer, who has a private value for the item, strategizes over the timing of the purchase to maximize expected utility. The value of the seller's ability to observe the buyer's arrival time in terms of expected revenue is analyzed.
MANAGEMENT SCIENCE
(2023)
Article
Energy & Fuels
Ianto O. Martins, Alexandre K. da Silva, Emilio C. C. M. Silva, A. Rashid Hasan, Jader R. Barbosa
Summary: This study presents a new transient thermo-structural model to predict the pressure and temperature distributions of annular fluids during injection operations in oil wells. The model shows good agreement with field data, indicating its accuracy in predicting the behavior of annular fluids.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Analytical
M. Vega, J. -F. Bryche, P. -L. Karsenti, P. Gogol, M. Canva, P. G. Charette
Summary: This paper proposes a 2D method for removing coherent artifacts from femtosecond time-resolved spectroscopy data, which is simple, intuitive, and light on computation resources. The effectiveness of the method is demonstrated with experimental data, and it is expected to be applicable to other types of time and wavelength-resolved spectroscopy data.
ANALYTICA CHIMICA ACTA
(2023)
Article
Computer Science, Information Systems
P. Juan Robles Balestero, Jaimis Sajid Leon Colqui, Sergio Kurokawa
Summary: This paper presents a transmission line model for simulating electromagnetic transients directly in the time domain. The model uses an exact equivalent pi-circuit to represent the line, and approximates the admittances using rational functions through vector fitting. The proposed model has the same characteristics as the exact equivalent pi-circuit in the time domain, can be used in circuit simulation software, and allows for the connection of nonlinear elements.
Article
Astronomy & Astrophysics
Brian Punsly, Hiroshi Nagai, Tuomas Savolainen, Monica Orienti
Summary: The recent development of global millimeter-band very long baseline interferometry (VLBI) has revealed the morphology of the base of the nearby bright extragalactic radio jets in M87 and 3C 84, showing surprising results compared to jet theory predictions. The complex nucleus of 3C 84 appeared as a double or triple nucleus in different observations with varying resolutions. The emergence of east-west double nucleus and the associated separation speed have also been studied, suggesting a predominantly east-west separation speed that persists over a considerable distance from the central supermassive black hole gravitational radius.
ASTROPHYSICAL JOURNAL
(2021)
Article
Optics
Igor Kudelin, Srikanth Sugavanam, Maria Chernysheva
Summary: This study presents a novel method based on time-stretch technique for real-time measurement of the absolute phase of ultrashort optical pulses. The method offers high acquisition rate and excellent resolution, allowing observation of phase oscillations induced by pulse intensity fluctuations.
Article
Optics
Tao Cao, Shaozhen Liu, Ziyue Guo, Kailin Hu, Jikun Yan, Zhihong Liu, Zhou Li, Kun Chen, Jiahui Peng
Summary: This study presents a method for quantifying dissipative effects in a mode-locked laser based on analyzing the soliton dynamics traced by time-stretch dispersive Fourier transform. Through simulations, the evolution of the pulse that seeds mode-locking can be quantitatively reproduced, leading to a deeper understanding of the whole process. The obtained physical picture of mode-locking allows for the proposal of a simple method to quantify the energy threshold for mode-locking buildup and the stability of mode-locked states.
Article
Instruments & Instrumentation
Dongdong Han, Yijie Wang, Zhanqiang Hui, Zhixing Zhang, Kaili Ren, Yipeng Zheng, Feng Zhao, Lipeng Zhu, Jiamin Gong
Summary: The research reveals that the Q-switched instabilities may be attributed to the weak pulse energy before reaching the stable soliton state. These findings can facilitate a more comprehensive understanding of the formation and breaking dynamics of dissipative solitons.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Energy & Fuels
Teng Wen, Xiang Cui, Xuebao Li, Hao Ma, Zhibin Zhao
Summary: This paper proposes a method to solve the transient electric field and charge density on the dielectric interface with high accuracy, using nodal finite element method in space and finite difference method in time. The proposed method is validated through a 2-D numerical example and compared with existing methods, showing a comparable or higher numerical accuracy.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2022)
Article
Chemistry, Multidisciplinary
Yuetian Jia, Chao Qian, Zhixiang Fan, Yinzhang Ding, Zhedong Wang, Dengpan Wang, Er-Ping Li, Bin Zheng, Tong Cai, Hongsheng Chen
Summary: Optical illusion has always been of great interest due to its self-protection ability. Transformation optics, which allows manipulation of light for invisibility cloaking and optical illusion, has faced challenges due to material requirements and computational cost. A novel optical illusion based on form-free metasurfaces and deep learning architecture is proposed, reducing the parameter space and bringing illusion strategies closer to practical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Min Huang, Bin Zheng, Tong Cai, Xiaofeng Li, Jian Liu, Chao Qian, Hongsheng Chen
Summary: This article proposes a machine-learning-enabled metasurface for direction of arrival (DOA) estimation. By controlling the metasurface, a series of field intensities can be generated and processed using a pretrained random forest model to accurately estimate the incident angle. Experimental results demonstrate high accuracy for a wide range of incident angles.
Article
Multidisciplinary Sciences
Chao Qian, Zhedong Wang, Haoliang Qian, Tong Cai, Bin Zheng, Xiao Lin, Yichen Shen, Ido Kaminer, Erping Li, Hongsheng Chen
Summary: This paper introduces the concept of neuro-metamaterials, which enable a dynamic entirely-optical object recognition and mirage. The experiments demonstrate that this technology can perceive the postures of rabbits at the speed of light and create dynamic optical mirages using holographic videos.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jiayi Wang, Rui Xi, Tong Cai, Huan Lu, Rongrong Zhu, Bin Zheng, Hongsheng Chen
Summary: This paper proposes a data cropping algorithm that significantly reduces the simulation time in the DNN pre-training process by cropping simulated data and adding random data. By using this algorithm and a target-driven DNN, a metasurface structure with a low profile and broad transmission characteristics is successfully designed.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Qingze Tan, Bin Zheng, Tong Cai, Chao Qian, Rongrong Zhu, Xiaofeng Li, Hongsheng Chen
Summary: This study presents a simple broadband spin-locked retroreflector that uses a metasurface with low-loss dielectric resonators. The results show that the proposed metasurface achieves retroreflection over a broadband spectrum while maintaining the spin state identical. The study also validates a broadband spin-locked cloak. This work represents a major advancement in practical retroreflector research.
Article
Materials Science, Multidisciplinary
Yijun Zou, Rongrong Zhu, Lian Shen, Bin Zheng
Summary: This paper proposes a computer-generated hologram algorithm with dynamic imaging distance and reconfigurable metasurface, aiming to address the high demands for dynamic imaging distances in practical scenarios.
FRONTIERS IN MATERIALS
(2022)
Article
Optics
Xiaofeng LI, Guangming Wang, Dan Liu, Yaqiang Xhuang, Bin Zhuang, Shen Lian, Xiaojun Zou, Tong Cai
Summary: This paper proposes a novel broadband circularly polarized transmitarray antenna (CPTA) enabled by axial-ratio-improved receiver-transmitter metasurface loaded with parasitic patches. The CPTA achieves a wide 3-dB axial ratio bandwidth and flat gain performance, making it suitable for wireless systems.
Article
Chemistry, Multidisciplinary
Xilai Zhao, Yanan Jiao, Jiangang Liang, Jing Lou, Jing Zhang, Jiawen Lv, Xiaohui Du, Lian Shen, Bin Zheng, Tong Cai
Summary: A hybrid THz metasurface composed of vanadium dioxide (VO2) and germanium (Ge) is proposed, allowing electrical and optical tuning methods individually or simultaneously. The device can switch on or off at four different frequencies and possesses two temporal degrees of freedom. AND and OR logic operations can be achieved at two adjacent frequency bands.
Article
Materials Science, Multidisciplinary
Yutong Jiang, Rongrong Zhu, Bo Yang, Huan Lu, Tianhang Chen, Bin Zheng
Summary: Programmable metasurfaces have gained significant attention due to their ability to shape far-field patterns. However, designing specific far-field patterns becomes challenging when irregular obstacles are present outside the metasurface. In this article, a four-layer artificial neural network method is proposed to predict the far-field radar cross section (RCS) of programmable metasurfaces in environments with obstacles, and it exhibits good agreement with simulation data. The proposed prediction model shows better learning and generalization capabilities.
FRONTIERS IN MATERIALS
(2022)
Article
Physics, Multidisciplinary
Rujiang Li, Xiangyu Kong, Dongkai Hang, Guoyi Li, Hongyu Hu, Hao Zhou, Yongtao Jia, Pengfei Li, Ying Liu
Summary: This work explores the properties of topological bulk solitons in a photonic Chern insulator in the presence of nonlinearities. It demonstrates the stability and robustness of these solitons, and highlights the interplay between topology and nonlinearity in photonic systems.
COMMUNICATIONS PHYSICS
(2022)
Article
Multidisciplinary Sciences
Huan Lu, Jiwei Zhao, Bin Zheng, Chao Qian, Tong Cai, Erping Li, Hongsheng Chen
Summary: This study is inspired by the human eye's accommodation mechanism and proposes a supervised-evolving learning algorithm and a neuro-metasurface focusing system. It achieves adaptive focusing for incident waves in different environments, demonstrating unprecedented potential in achromatic, beam shaping, 6G communication, and intelligent imaging.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Xingshuo Cui, Dan Liu, Zanyang Wang, Dengpan Wang, Borui Wu, Guangming Wang, Bin Zheng, Tong Cai
Summary: This paper proposes a general strategy for designing spin-locked achromatic metasurfaces with broadband and high efficiency properties. By controlling the dispersion through tuning resonance intensity, numbers, and frequency, the metasurfaces achieve achromatic deflection and focus effects in the microwave region. Experimental results demonstrate that the metasurfaces have ultra-thin profiles and can preserve the characteristics of excitation.
Article
Engineering, Electrical & Electronic
Qingze Tan, Chao Qian, Tong Cai, Bin Zheng, Hongsheng Chen
Summary: This study introduces a new method for solving complex equations using electromagnetic fields and metamaterial kernels in a closed-loop system. The system can recursively solve equations for arbitrary input signals and improve the solution accuracy by designing the metamaterial kernels through topology optimization.
PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Ye Dong, Xinyu Wu, Wenhao Li, Yudong Ren, Yihao Yang, Jiangtao Huangfu, Long Li, Rui Xi, Hongsheng Chen, Bin Zheng
Summary: This paper presents the design of a low profile transmitarray antenna with high polarization purity and wide operational band. It allows for adjustable beam scanning and polarization selectivity, which are crucial for radar detection and environmental adaption. By employing partially reflective surface (PRS) elements based on substrate integrated waveguide (SIW) and aperture coupling, a compact low profile transmitarray antenna with reduced element coupling is achieved. The use of SIW based phase delay enables coverage of a continuous 360 degree phase range.
2022 PHOTONICS & ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS 2022)
(2022)
Article
Materials Science, Multidisciplinary
Rujiang Li, Pengfei Li, Yongtao Jia, Ying Liu
Summary: This research proposes self-localized topological states in a 3D nonlinear photonic system, where the topological solitons at high-symmetry points rotate in the same direction and remain stable under the saturable nonlinearity. The findings highlight the interaction between topology and nonlinearity and its potential application in other 3D topological systems.
