A5101904721- Topological Materials and Phenomena
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Fiber Laser Technologies
- Quantum chaos and dynamical systems
- Quantum, superfluid, helium dynamics
- Optical Network Technologies
- Magneto-Optical Properties and Applications
- Nonlinear Photonic Systems
- Mechanical and Optical Resonators
- Advanced Condensed Matter Physics
- Orbital Angular Momentum in Optics
Hunan University
2021-2025
Hunan University of Technology
2021
Hunan Normal University
2021
Topological singularities, such as Weyl points (WPs) and Dirac points, can give rise to unidirectional propagation channels known chiral zero modes (CZMs) when subject a magnetic field. CZMs, distinct zeroth Landau levels (bulk modes) with high degeneracy, are responsible for intriguing phenomena like the anomaly in quantum systems. The direction of each CZM is determined by both applied field topological charge singularity point. While counterpropagating CZMs have been observed 2D 3D...
We theoretically set up a 4 × magneto-optical matrix to investigate the transmittances induced by forward and backward left hand circularly polarized (LCP) waves impinging μm thickness Weyl semimetal (WSM) material at normal incidence. Because of different effective permittivity two LCP in WSM non-zero off-diagonal term, experience blocking transmission, bidirectional transmission unidirectional with increase wavelength, respectively. Based on wide wavelength broadband optical isolator can...
Abstract Manipulating wave propagation and energy collection plays a core role in modern physics, for which topological insulators hosting robust boundary states offer an ideal platform. However, there exist challenges integrating multiple like two-dimensional (2D) surface state, one-dimensional (1D) hinge zero-dimensional (0D) corner state into single three-dimensional (3D) architecture. Here we introduce dimensional hierarchy acoustic structure with piled 3D Kagome-chain crystal. By tuning...
Abstract The ability to confine and guide wave makes topological physics a promising platform for large local field enhancement strong scattering immunity, which enables efficient nonlinear processes. In this research, we employ mirror-stacking approach achieve resonance through two distinct frequency localized states (LSs) in one-dimensional circuits, introducing novel method validating facilitate harmonic enhancement. Experimental results reveal that the power increases significantly, by...
Photonic topological insulators have recently received widespread attention mainly due to their ability provide directions in the development of photonic integration platforms. The proposal for a bulk cavity with single-mode expands upon previous research works on cavities; thus, interest edge states and corner is beginning shift into analysis properties applications. However, there remains gap multi-mode crystals (PCs). In this Letter, PCs proposed involving pair-partitioned localized...
Bound states in the continuum (BICs) have received considerable attention field of nanophotonics due to their highly confined resonance and high Q factor, which effectively eliminates radiation loss. Various periodic structures been studied achieve BICs, with photonic crystal slabs (PCSs) being a prominent example. In PCS, multiple BICs can be merged strongly suppress out-of-plane-scattering losses caused by fabrication imperfections. this paper, we investigate impact reflection-type merging...
In this paper, we theoretically study the Faraday (FR) rotation effect excited by a transverse-magnetic (TM)-polarized wave passing through bulk Weyl semimetal (WSM). Results show that FR angle maintains large value $(\ensuremath{\sim}\text{--}{21}^{\ensuremath{\circ}})$ with high transmission $(|{t}_{pp}|\ensuremath{\sim}87%)$, which is caused close coefficient of $|{t}_{ps}|$ and $|{t}_{pp}|$. What more important, can be further enhanced at epsilon-near-zero (ENZ) frequency, where maximum...
A Weyl semimetal can be considered as a system composed of two cones breaking time-reversal symmetry, which exhibits strong anisotropic hyperbolic characteristics. The off diagonal components the permittivity tensor produce Faraday and Kerr effects. In this paper, we investigate Goos–Hänchen (GH) shifts when light is reflected from interface air semimetal. It demonstrated that angular GH shift still tiny; however, spatial huge very sensitive to change in incident angle. positive negative...
<title>Abstract</title> Emergent collective modes in lattices give birth to many intriguing physical phenomena condensed matter physics. Among these modes, large area typically feature small level spacings, whilst a single mode tends be spatially tightly confined. Here, we theoretically propose and experimentally demonstrate unique scale-invariant, large-area, single-mode topological cavity two-dimensional photonic crystal. This emerges from the hybridization of large-area fundamental Dirac...
The extended state pertains to the dispersion of system's eigenfunctions across whole lattice. Recent studies have shown that non-Hermitian skin effect (NHSE) can reshape wavefunction topological modes. localized states modes within bandgap gradually delocalized into through manipulation NHSE. Here, we clarify NHSE direction using Bloch spectral winding numbers and reestablish bulk-boundary correspondence non-Bloch in generalized Brillouin zone. We elucidate formation by employing decay...
Topological photonic crystal provides a platform for robust energy transport in systems. In this letter, we propose method realizing rainbow trapping and releasing based on the topologically protected defect modes dielectric crystals. The states of different frequencies are separated trapped at positions to form topological rainbow. all-dielectric planar nanostructures consist deformed honeycomb lattices gradient 1D array, which is distinct from previous platforms where edge appear interface...
<title>Abstract</title> Emergent collective modes in lattices give birth to many intriguing physical phenomena condensed matter physics. Among these modes, large area typically feature small level spacings, whilst a single mode tends be spatially tightly confined. Here, we theoretically propose and experimentally demonstrate unique scale-invariant, large-area, single-mode topological cavity two-dimensional photonic crystal. This emerges from the hybridization of large-area fundamental Dirac...
The 8 × magneto-optical matrix has been derived to discuss the Faraday rotation (FR) effect, which is induced by linear polarization wave passing through a sandwich structure composed of dielectric layer and two identical Weyl semimetals (WSMs). giant enhanced FR angle about 45° can be realized at resonant tunneling wavelength right hand circularly (RCP) waves enlarging difference RCP left suitably. It shown that wavelengths depend on node separation tilt degree cones in both type-I type-II...
Generally, the second-harmonic generation and slow light of multi-band topological edge states (TESs) have been studied separately. Therefore, influence simultaneous topology protection on (SHG) is deficient. Here, we propose a high-efficiency SHG using dual-frequency TESs in photonic crystals (TPCs) with slow-light conditions. The wave vector matching condition energy conservation (frequency doubling) can be achieved by adequately adjusting overall structural parameters TPCs....
Orbital angular momentum (OAM) is a fundamental property of electromagnetic waves and inherently carried by all frequencies waves. In particular, OAM applications at radio (RFs) have attracted much attention due to their unique functionalities in communications. Enabled the present wireless communication system, employing circular antenna array (CAA) highly compatible cost-effective approach for generating RF-OAM beams. this paper, recent progress on systems with CAAs from transceiver...