A5017412318- Photonic and Optical Devices
- Chaos control and synchronization
- Mechanical and Optical Resonators
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Topological Materials and Phenomena
- Advanced Fiber Laser Technologies
- Nonlinear Dynamics and Pattern Formation
- Photonic Crystals and Applications
- Quantum Mechanics and Non-Hermitian Physics
- Quantum chaos and dynamical systems
- Magneto-Optical Properties and Applications
- Soil Moisture and Remote Sensing
- Metamaterials and Metasurfaces Applications
- Neural Networks Stability and Synchronization
- Advanced Image and Video Retrieval Techniques
- Image Retrieval and Classification Techniques
- Laser-Matter Interactions and Applications
- Cryospheric studies and observations
- Nonlinear Photonic Systems
- Quantum optics and atomic interactions
- Neural Networks and Reservoir Computing
- Image and Signal Denoising Methods
- Advanced Control Systems Design
- Neural dynamics and brain function
- Orbital Angular Momentum in Optics
Lanzhou University of Technology
2005-2024
Zhejiang Sci-Tech University
2024
Hubei University
2024
Minzu University of China
2024
Jiaxing University
2023
Zhejiang University
2023
Hewlett Packard Enterprise (United States)
2023
Foshan University
2022-2023
Naval University of Engineering
2009-2021
Tongji University
2020-2021
The physics of a photonic structure is commonly described in terms its apparent geometric dimensionality.On the other hand, with concept synthetic dimension, it fact possible to explore space dimensionality that higher as compared geometrical structures.In this review, we discuss basic concepts dimension photonics, and highlighting various approaches towards demonstrating such for fundamental potential applications.
Abstract Weyl points, as a signature of 3D topological states, have been extensively studied in condensed matter systems. Recently, the physics points has also explored electromagnetic structures such photonic crystals and metamaterials. These typically complex three-dimensional geometries, which limits potential for exploring point on-chip integrated Here we show that emerges system two-dimensional arrays resonators undergoing dynamic modulation refractive index. In addition, phase can be...
We report the existence of Weyl points in a class noncentral symmetric metamaterials, which has time reversal symmetry, but does not have inversion symmetry due to chiral coupling between electric and magnetic fields. This metamaterial exhibits either type-I or type-II depending on its nonlocal response. also provide physical realization such consisting an array metal wires shape elliptical helices points.
There has been significant recent interest in synthetic dimensions, where internal degrees of freedom a particle are coupled to form higher-dimensional lattices lower-dimensional physical structures. For these systems, the concept band structure along dimension plays central role their theoretical description. Here we provide direct experimental measurement dimension. By dynamically modulating resonator at frequencies commensurate with its mode spacing, create periodically driven lattice...
The concept of synthetic dimensions, which has enabled the study higher-dimensional physics on lower-dimensional physical structures, generated significant recent interest in many branches science ranging from ultracold-atomic to photonics, since such a provides versatile platform for realizing effective gauge potentials and novel topological physics. Previous experiments demonstrating this have augmented real-space dimensionality by one additional dimension. Here we endow single ring...
In the development of topological photonics, achieving three-dimensional insulators is notable interest since it enables exploration new physics with photons and promises novel photonic devices that are robust against disorders in three dimensions. Previous theoretical proposals toward use complex geometries challenging to implement. On basis concept synthetic dimension, we show a two-dimensional array ring resonators, which was previously demonstrated exhibit insulator phase, automatically...
We explore a single degenerate optical cavity supporting synthetic two-dimensional space, which includes the frequency and orbital angular momentum (OAM) axes of light. create effective gauge potential inside this space show that system exhibits topologically protected one-way edge states along OAM axis at boundaries dimension. In we present robust generation manipulation entanglement between photons. Our Letter shows higher-dimensional involving multiple degrees freedom light can be...
It is known that interferometric synthetic-aperture radar (SAR) images can be inverted to perform surface elevation mapping. Among the factors critical mapping accuracy are registration of interfering SAR and phase unwrapping. A algorithm presented determines parameters through optimization. figure merit proposed evaluates result during The unwrapping problem approached a new method involving fringe line detection. algorithms tested with two SEASAT terrain near Yellowstone National Park....
We propose a waveguiding mechanism based on the effective gauge potential for photons. The waveguide geometry consists of core and cladding regions with same underlying dispersion relation, but subject to different potentials. This can be realized in dynamically modulated resonator lattice provides conceptually straightforward reconfigurable generating one-way waveguide.1 MoreReceived 9 April 2014DOI:https://doi.org/10.1103/PhysRevX.4.031031This article is available under terms Creative...
We show that a single ring resonator undergoing dynamic modulation can be used to create synthetic space with an arbitrary dimension. In such system the phases of photonic gauge potential in high dimensions. As illustration implication this concept, we Haldane model, which exhibits non-trivial topology two dimensions, implemented using three rings. Our results point route towards exploring higher-dimensional topological physics low-dimensional physical structures. The dynamics photons spaces...
We show that a dynamic gain-loss modulation in an optical structure can lead to direction-dependent parity-time ($\mathcal{PT}$) phase transition. The transition be made thresholdless the forward direction, and yet remains with nonzero threshold backward direction. As result, nonreciprocal directional amplification realized. Such directly integrated semiconductor laser provide isolation for laser.
This paper introduces a diagonal adaptive kernel model that dynamically learns eigenvalues and output coefficients simultaneously during training. Unlike fixed-kernel methods tied to the neural tangent theory, adapts structure of truth function, significantly improving generalization over methods, especially when initial is misaligned with target. Moreover, we show adaptivity comes from learning right training, showing feature behavior. By extending deeper parameterization, further how extra...
The elastic scattering of ${}^{8}$B by a ${}^{\mathrm{nat}}$Pb target was measured at an incident energy 170.3 MeV. Special care taken with the limited intensity and broad profile secondary beam. angular distribution differential cross section shows that Coulomb-nuclear interference peak (CNIP) is not suppressed in this system, contrast to what observed neutron halo nuclei heavy targets energies around Coulomb barrier. Analyses were performed both terms optical model using...
Optical isolators, which break the Lorentz reciprocity, are fundamental building blocks for regulating flow of light. Here, we provide a brief perspective on developments in nonmagnetic approaches to constructing optical isolators. We show that nonlinear isolators fundamentally constrained by dynamic reciprocity and cannot completely reproduce functionalities standard magneto-optical devices. also complete isolation is achievable with modulation refractive index. Moreover,...
An adaptive vector linear minimum mean-squared error (LMMSE) filter for multichannel images with multiplicative noise is presented. It shown theoretically that the in output reduced by making use of correlation between image bands. The and conventional scalar LMMSE filters are applied to a three-band SIR-B SAR, their performance compared. Based on mutliplicative model, per-pel maximum likelihood classifier was derived. authors extend this design sequential robust classifiers. These...
We consider an actively mode-locked laser system with parity-time symmetry. The consists of two ring cavities, each incorporating amplitude modulator operating at the same modulation frequency, but phases differing by π. show that spontaneous symmetry breaking can be used to shorten temporal width pulse generated through active mode locking in this system. Our work highlights importance applying concept pulsed systems.
We consider a ring resonator with two resonant modes undergoing dynamic modulation. Using the Floquet analysis, we show that proper choice of modulation profile, such can achieve direction-dependent Rabi splitting its eigenstates, which results in dissipation and nonreciprocal transmission for waves. numerically demonstrate this effect realistic refractive index result significant one direction near complete in.
During recent years, deep learning methods have shown to be effective for image classification, localization and detection. Convolutional Neural Networks (CNN) are used extract information from images the main element of modern machine computer vision methods. CNNs can logo detection recognition. Logo consist on locate recognize commercial brand logos within an image. These useful in areas online management or ad placement. The performance this is closely related quantity quality data,...
Non-magnetic dynamic optical isolators, constructed from modulators, provide a complementary metal oxide semiconductor (CMOS)-compatible approach to isolation in integrated photonics. The size of these isolators is strongly constrained by both the frequency and strength modulation. Recent developments modulators have indicated that large modulation strength, with magnitude refractive index up unity, may be possible at gigahertz frequency. In this Letter, we show previously proposed isolator...
A coherent-modulation-imaging-based (CMI) algorithm has been employed for on-shot laser beam diagnostics in high-power facilities, where high-intensity short-pulsed lasers from terawatt to petawatt are designed realize inertial confinement fusion (ICF). single-shot intensity measurement is sufficient wave-front reconstruction, both the near-field and far-field at same time. The iterative reconstruction process computationally very efficient was completed dozens of seconds by additional use a...
Interferometric synthetic aperture radar presents a new technology for performing high-resolution topographic mapping. One of the factors critical to mapping accuracy is phase unwrapping. This paper algorithm that unwraps through fringe-line detection. The effective in preventing error propagation, it preserves image resolution, and, mean time, produces negligible local errors. An edge-segment linking approach and curve-fitting are investigated, their performances compared. Test results...
The noise effects on a homeostatic regulation of sleep-wake cycles’ neuronal mathematical model determined by the hypocretin/orexin and local glutamate interneurons spatiotemporal behaviors are studied within neighborhood stimulus threshold in this work; added to stimulus, conductance, activation variable modulation function investigated, respectively, based circadian input skewed sine function. computer simulation results suggested that increased amplitude external current will lead fact...