A5100752516- Orbital Angular Momentum in Optics
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Near-Field Optical Microscopy
- Mechanical and Optical Resonators
- Microfluidic and Bio-sensing Technologies
- Theoretical and Computational Physics
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Quasicrystal Structures and Properties
- Lattice Boltzmann Simulation Studies
- Experimental and Theoretical Physics Studies
- Quantum Information and Cryptography
- Force Microscopy Techniques and Applications
- Electromagnetic Scattering and Analysis
- Vibration Control and Rheological Fluids
- Fluid Dynamics and Vibration Analysis
- Aerosol Filtration and Electrostatic Precipitation
- Digital Holography and Microscopy
- Quantum optics and atomic interactions
- Quantum many-body systems
- Random lasers and scattering media
- Topological Materials and Phenomena
- Optical Coatings and Gratings
The First People's Hospital of Zhaoqing
2025
Fudan University
2015-2024
State Key Laboratory of Surface Physics
2015-2024
Nanjing University
2015-2024
Collaborative Innovation Center of Advanced Microstructures
2015-2023
University of Delaware
2004-2014
Hong Kong University of Science and Technology
1999-2011
University of Hong Kong
1999-2011
Soochow University
2010
Zhejiang Normal University
2010
We present an experimental demonstration of self-guiding electromagnetic edge states existing along the zigzag a honeycomb magnetic photonic crystal. These are shown to possess unidirectional propagation characteristics that robust against various types defects and obstacles. In particular, they allow for transport energy without requiring ancillary cladding layer.
We propose a rigorous theory for the optical trapping by vortices, which is emerging as an important tool to trap mesoscopic particles. The common perception that solely due gradient force, and may be characterized three real force constants. However, we show vortex can exhibit complex constants, implying must stabilized ambient damping. At different damping levels, particle shows remarkably dynamics, such stable trapping, periodic aperiodic orbital motions.
We study the edge states in two-dimensional photonic crystals arising from a singular point $k$ space at which two dispersion surfaces intersect. The zigzag honeycomb lattice for TM polarization are analogous to electronic ones graphene nanoribbons. Electromagnetic modes edges of such consisting ferrite rods allowed propagate only along one direction. one-way propagation is insensitive imperfections on edge.
We demonstrate theoretically that Fano resonance can induce a negative optical scattering force acting on plasmonic nanoparticles in the visible light spectrum when an appropriate manipulating laser beam is adopted. Under illumination of zeroth-order Bessel beam, nanoparticle at its exhibits much stronger forward than backward and consequently leads to net longitudinal force, termed resonance-induced force. The extinction spectra obtained based Mie theory show arises from interference...
By employing the angular spectrum representation, we successfully derive partial-wave expansion coefficients of circular Airy beams (CABs) with different polarizations, based on which scattering a spherical particle in CABs is solved exactly. Special attention focused exploring potential applications abruptly autofocusing (AAF) property and optical manipulation microparticle by force. It found that both linear polarizations are best candidates to implement AAF robustly against strong...
A lattice Boltzmann method for simulating the viscous flow in large distensible blood vessels is presented by introducing a boundary condition elastic and moving boundaries. The mass conservation tested detail. simulated with pressure-radius relationship similar to that of pulmonary vessels. numerical results steady agree analytical prediction very high accuracy, simulation pulsatile are comparable those aortic flows observed experimentally. model expected find many applications studying...
We show through rigorous calculations that small dielectric microspheres can be organized by an incident electromagnetic plane wave into stable geometric configurations, which we call photonic clusters. The long-ranged optical binding force arises from the multiple scattering between spheres. A cluster exhibit a multiplicity of distinct geometries, including quasicrystal-like with exotic dynamics. Linear stability analysis and dynamical simulations equilibrium configurations correspond...
Explicit partial wave coefficients are derived for nondiffractive vector Bessel beam of arbitrary order and polarization. Calculations based on the analytical expansion yield results that agree well with recent numerical calculations experiments optical binding. We have also investigated how one can tailor interparticle interaction by overlaying different coatings. It is found Ag low dielectric coating increase number equilibrium positions, whereas antireflection reduces it.
We demonstrate a sharply asymmetric reflection in geometrically symmetric magnetic metamaterial (MM) system, which originates from the coupling of electromagnetic (EM) wave to surface plasmon resonance states and broken time reversal symmetry MM. Based on this effect, we have designed unidirectional EM waveguide, bender, beam splitter. Our simulations indicate that designs possess merits robustness against strong defect disorder, controllability with an external field, addition finite...
Based on the generalized Lorenz-Mie theory and Maxwell stress tensor formulism, we calculate transverse force constant matrix perform a linear stability analysis spherical particle that is subject to negative longitudinal optical (NLOF) under illumination of Bessel beams. Phase diagrams with respect material parameters are presented, which exhibit possibility appearance NLOF. From dynamical simulations performed both in plane along direction, an even clearer picture realization stable NLOF...
Light carries angular momentum and as such it can exert torques on material objects. Applications of these opto-mechanical effects were limited initially due to their smallness in magnitude, but later becomes powerful versatile after the invention laser. Novel practical approaches for harvesting light particle rotation have since been demonstrated, where structure is always subjected a positive optical torque along certain axis if incident has projection same axis. We report here an...
We demonstrate that a lateral optical force (LOF) can be induced on chiral nanoparticles immersed in the two interfering plane waves. The LOF push nanoparticle sideways, direction relying helicity of particle as well phase difference between Analytical theory reveals comes mostly from direct coupling vorticity with chirality. In particular, has magnitude comparable to gradient and radiation pressure when chirality is sufficiently large. may serve for sorting due its unusual properties also...
The introduction of the concept gradient force and scattering absorption is an important milestone in optical trapping. However profiles these forces are usually unknown, even for standard setups. Here, we successfully calculated them analytically via multipole expansion numerically Mie theory fast Fourier transform. former provides physical insight, while latter highly accurate efficient. A recipe to create truly conservative energy landscapes presented. These may open up qualitatively new...
Optical tractor beams, proposed in 2011 and experimentally demonstrated soon after, offer the ability to pull particles against light propagation. It has attracted much research public interest. Yet, its limited microscopic-scale range severely restricts applicability. The dilemma is that a long-range Bessel beam, most accessible beam for optical traction, small half-cone angle, θ0, making pulling difficult. Here, by simultaneously using several novel compatible mechanisms, including...
We demonstrated a construction of negative-index material (NIM) with ${\ensuremath{\epsilon}}_{\mathrm{eff}}={\ensuremath{\mu}}_{\mathrm{eff}}=\ensuremath{-}1$ employing ferrites only, no metallic components. Our design the NIM is motivated by recent coherent potential approximation results and corroborated exact numerical calculation demonstrating negative refraction an electromagnetic beam, equal incident angles, as well slab imaging phenomena, source-image separation twice thickness. The...
We demonstrate a dramatically molded reflection of an electromagnetic (EM) wave from the magnetic metamaterial (MM) surface occurring near plasmon (MSP) resonance. It is found that on one side source reflected field nearly cancels incoming field, giving rise to shadowy region MM surface, while other considerably enhances resulting in brightened region. Our analysis indicates this effect arises coupling EM MSP band states which exhibit giant circulations going only direction due broken time...
Lateral optical forces in a direction perpendicular to light propagation have attracted increasing interest recent years. Up now, all lateral can be attributed the symmetry breaking directions caused by either morphology of scatterer geometry or fields impinging on scatterer. Here we demonstrate, both numerically and analytically, that when an isotropic breaks electric-magnetic symmetry, new type anomalous force induced along translational invariance where illumination striking has no...
Abstract Interacting with an evanescent wave, achiral particle can experience a lateral optical force (LOF) in direction which is perpendicular to that of the illuminating photon momentum while system apparently has left–right symmetry. Here, using Cartesian multipole expansion theory, general relationship between LOF and spin established. Most importantly, it demonstrated anomalous exerted on isotropic arbitrary size composition proportional transverse incident wave carries pure associated...
To assess the risk factors associated with H. pylori infection in urban Chinese population. The study was conducted from March to November 2023, including 12,902 participants aged 18-60 years across 52 cities distributed over 26 provinces China. Risk included socioeconomic status, lifestyles, and public understanding. Univariate multivariate logistic regression analysis used calculate corrected odds ratios (ORs) 95% confidence intervals (CIs). According regression, significantly higher rates...
The Mie theory for electromagnetic scattering by spherical particle is extended to the case of magnetic with gyromagnetic type permeability. Specifically, we first construct induction ${\mathbf{B}}_{I}$ inside a new set vector basis functions, which are solution wave equation and expanded in terms usual functions (VSWF's) different values ${k}_{l}$. relationship between ${k}_{l}$ frequency obtained as eigenvalues an eigensystem determined permeability tensor. incident scattered fields...
The technique of lattice Boltzmann simulation has been applied to the study two-dimensional particle suspensions through a modeled arterial stenosis. stenosis model consists two-side symmetric semicirculars in planar channel with width throat larger than d and less $2d,$ where is diameter particles. When only one positioned off-centerline initially, migrates after passing velocity at much that flat tube. Only when two particles are symmetrically centerline very high accuracy can flow be...
We examine the mechanism governing photonic band gaps (PBGs) in two-dimensional magnetic crystals consisting of ferrite cylinders, based on simulation structure and transmission spectra. Besides conventional PBG resulting from Bragg scattering, two other types PBGs, owing, respectively, to Mie scattering resonance spin-wave resonance, are identified. Of particular interest is due that can be regarded as a analog surface plasmon metal. The ``magnetic plasmon'' induced resonant PBGs shown...
We have developed an effective-medium theory within the coherent-potential approximation, which is especially suitable to retrieve effective constitutive parameters (permittivity and permeability) of anisotropic magnetic metamaterials consisting ferrite rods. The anisotropy originates from gyromagnetic property material whose permeability a tensor with nonzero off-diagonal components. To confirm validity our method photonic band structures two-dimensional periodic are calculated, in...