A5000272786- Topological Materials and Phenomena
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Quantum Mechanics and Non-Hermitian Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
- Quantum Information and Cryptography
- Nonlinear Photonic Systems
- Photonic Crystals and Applications
- Photorefractive and Nonlinear Optics
- Quantum chaos and dynamical systems
- Spectroscopy and Quantum Chemical Studies
- Spectroscopy and Laser Applications
- Laser Design and Applications
- Optical Network Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Random lasers and scattering media
- Metamaterials and Metasurfaces Applications
- Quantum, superfluid, helium dynamics
- Orbital Angular Momentum in Optics
- Terahertz technology and applications
- Ion-surface interactions and analysis
Shanghai Jiao Tong University
2008-2025
Development Research Center
2023
Beijing University of Technology
2023
The University of Sydney
2023
Shanghai Children's Hospital
2022-2023
Stanford University
2015-2020
Texas A&M University
2010-2018
Harbin Engineering University
2015-2017
Princeton University
2012-2013
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.
We generalize the concept of photonic gauge potential in real space by introducing an additional "synthetic" frequency dimension addition to dimensions. As illustration, we consider a one-dimensional array ring resonators, each supporting set resonant modes having comb with spacing Ω, and undergoing refractive index modulation at equal Ω. show that phase provides synthetic two-dimensional dimensions being spatial axes. Such can create topologically protected one-way edge state is useful for...
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...
Abstract Topological photonics seeks to control the behaviour of light through design protected topological modes in photonic structures. While this approach originated from studying electrons solid-state materials, it has since blossomed into a field that is at very forefront search for new types matter. This can have real implications future technologies by harnessing robustness applications devices. roadmap surveys some main emerging areas research within photonics, with special attention...
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...
We provide a systematic study of non-Hermitian topologically charged systems. Starting from Hermitian Hamiltonian supporting Weyl points with arbitrary topological charge, adding perturbation transforms the to one-dimensional exceptional contours. analytical prove that charge is preserved on In contrast systems, addition gain and loss allows for new class phase transition: when two oppositely contours touch, can dissipate without opening gap. These effects be demonstrated in realistic...
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...
The ability to control the spectrum of light is fundamental significance in many applications light. We consider a dynamically modulated ring resonator that supports set resonant modes equally spaced their frequencies, and at frequency slightly detuned from modal spacing. find such system can be mapped into tight-binding model photons under constant effective force, and, as result, exhibits Bloch oscillation along axis. sign detuning force hence controls direction oscillation. also show...
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...
We report an experiment showing the submillimeter Imbert-Fedorov shift from ultrastrong spin-orbital angular momentum coupling, which is a photonic version of spin Hall effect, by measuring reflection light surface birefringent symmetrical metal cladding planar waveguide. The incidents at near-normal incident angle and excites resonant ultrahigh-order modes inside A 0.16-mm displacement separated reflected spots corresponding to two polarization states distinguishable human eyes. In our...
The concept of synthetic dimensions in photonics has attracted rapidly growing interest the past few years. Among a variety photonic systems, ring resonator system under dynamic modulation been investigated depth both theory and experiment, proven to be powerful way build frequency dimensions. In this tutorial, we start with pedagogical introduction theoretical approaches describing dynamically modulated system, then review experimental methods building such system. Moreover, discuss...
Topologically protected edge states based on valley photonic crystals (VPCs) have been widely studied, from theoretical verification to technical applications. However, research integrated tuneable topological devices is still lacking. Here, we study the phase-shifting theory of modes a VPC structure. Benefiting phase vortex formed by structure, optical path mode in propagation direction approximately two-fold that conventional strip waveguide. In experiments, show 1.57-fold improvement...
Abstract Valley‐Hall photonic topological insulators (VPTIs) provide an intriguing approach to suppress backscattering, enhance the robustness of transport, and shrink footprints devices. However, previous works focused on transmission characteristics symmetric waveguides with few reports functional devices involving edge mode coupling, which hinders implementation various such as optical couplers/splitters, switches, filters, etc. In this paper, a new method manipulate field distributions...
Abstract Synthetic dimensions have garnered widespread interest for implementing high dimensional classical and quantum dynamics on low-dimensional geometries. frequency dimensions, in particular, been used to experimentally realize a plethora of bulk physics effects. However, synthetic dimension there has not demonstration boundary which is paramount importance topological due the bulk-edge correspondence. Here we construct boundaries dynamically modulated ring resonators by strongly...
Supercontinuum (SC) light sources hold versatile applications in many fields ranging from imaging microscopic structural dynamics to achieving frequency comb metrology. Although such broadband are readily accessible the visible and near infrared regime, ultraviolet (UV) extension of SC spectrum is still challenging. Here, we demonstrate that joint contribution strong field ionization quantum resonance leads unexpected UV continuum radiation spanning 100 nm bandwidth molecular nitrogen ions....
Measuring topological invariants is an essential task in characterizing phases of matter. They are usually obtained from the number edge states due to bulk-edge correspondence or interference since they integrals geometric energy band. It commonly believed that bulk band structures could not be directly used obtain invariants. Here, we implement experimental extraction Zak phase a Su-Schrieffer-Heeger (SSH) model synthetic frequency dimension. Such SSH lattices constructed axis light, by...
Weyl medium has triggered remarkable interest owing to its nontrivial topological edge states in 3D photonic band structures that were mainly revealed as surface modes yet. It is undoubted the connection of two different media will give rise more fruitful physics at their interface, while they face extreme difficulty high-dimensional lattice matching. Here, we successfully demonstrate non-Hermitian interface complex synthetic parameter space, which implemented a loss-controlled silicon...
The moiré lattice has recently attracted broad interest in both solid-state physics and photonics where exotic phenomena manipulating the quantum states are explored. In this work, we study one-dimensional (1D) analogs of "moiré" lattices a synthetic frequency dimension constructed by coupling two resonantly modulated ring resonators with different lengths. Unique features associated flatband manipulation as well flexible control localization position inside each unit cell have been found,...
The moir\'e superlattices attract growing interest for holding exotic physics due to their fascinating properties from electronics photonics. Much attention has been focused on the localization effect waves in flat band regime or delocalization strongly dispersive feature. Here, we study weakly between two above scenarios a one-dimensional synthetic frequency superlattice and observe wave packet distributions therein toward novel comb generation. Mode spacing spectral is reduced compared...
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 reveal the meron and antimeron spin textures in momentum space a photonic crystal slab. These have not been previously noted either electronic or systems. Breaking inversion symmetry of honeycomb gaps out Dirac cones at corners Brillouin zone. The bands near exhibit antimeron. Unlike systems, texture modes manifests directly polarization leakage radiation, as points can be above light line. provides direct approach to visualize local Berry curvature. Our work highlights significant...
We experimentally demonstrate the existence of long-lived coherent polarizations coupling simultaneously ground state X (X2Σg+) to excited states A (A2Πu) and B (B2Σu+) N2+ inside a plasma created by short intense laser pulse at 800 nm. This three-level V-scheme arrangement is responsible for strong optical gain without population inversion B–X transition 391.4 Simulations based on Maxwell-Bloch equations reproduce well kinetics pressure dependence gain.