Owing to the chirality of Weyl nodes, systems can support one-way chiral zero modes under a strong magnetic field, which leads nonconservation currents-the so-called anomaly. Although promising for robust transport optical information, bulk have not been observed in photonics. Here we design an inhomogeneous metamaterial gauge field is generated nodes by engineering individual unit cells. We experimentally confirm presence and observe zero-order Landau level with propagation. Without...

Electromagnetic wave propagation in three-dimensional (3D) space typically suffers omnidirectional scattering when encountering obstacles. In this study, we used Chern vectors to construct a topological heterostructure, where large-volume nonreciprocal transport 3D is achieved. The shape of the cross section heterostructure can be arbitrary designed, and experimentally observed distinctive cross-shaped field pattern transport, energy harvesting, remarkable ability electromagnetic traverse...

Chiral zeroth Landau levels are topologically protected bulk states that give rise to chiral anomaly. Previous discussions on such based three-dimensional Weyl degeneracies. Their realizations using two-dimensional Dirac point systems, being more promising for future applications, were never reported before. Here we propose a theoretical and experimental scheme realizing in photonic system. By introducing an inhomogeneous effective mass through breaking local parity inversion symmetries, the...

Owing to the chirality of Weyl nodes characterized by first Chern number, a system supports one-way chiral zero modes under magnetic field, which underlies celebrated anomaly. As generalization from three-dimensional five-dimensional physical systems, Yang monopoles are topological singularities carrying nonzero second-order numbers c2 = +1 or -1. Here, we couple monopole with an external gauge field using inhomogeneous metamaterial, and experimentally demonstrate existence gapless mode,...

Rapid and convenient biosensing platforms could be beneficial to timely diagnosis treatment of diseases in virtually any care settings. Sandwich immunoassays, the most commonly used methods for protein detection, often rely on expensive tags such as enzyme tedious wash incubation procedures operated by skilled labor. In this report, we revolutionized traditional sandwich immunoassays providing a wash-free homogeneous colorimetric immunoassay method without requirement separation steps. The...

Synthesis and reactivity of disilicon(0) complexes are fundamental application importance. Herein, we report the development an N-heterocyclic imino-substituted silylene (1), which has strong σ-donating ability is significantly sterically hindered. The one-pot reaction this with [IPr→SiCl2 ] (IPr=1,3-bis(2,6-diisopropylphenyl)-imidazol-2-ylidene) KC8 (2 equiv) in THF at -30 °C leads to a silylene-ligated complex (2), isolated as red crystals 60 % yield. Characterization data DFT calculations...

Abstract The radiation of an electric dipole emitter can be drastically enhanced if the is placed in nano-gap a metallic antenna. By assuming that only surface plasmon polaritons (SPPs) are excited on antenna, we build up intuitive pure-SPP model able to comprehensively predict electromagnetic features antenna radiation, such as total or radiative emission rate and far-field pattern. With distinguish respective contributions from SPPs other waves radiation. It found for antennas with long...

The plasmonic nanogap antenna is an efficient radiating or receiving optical device. resonance behavior of antennas commonly attributed to the excitation a localized surface plasmon (LSPR), which can be theoretically defined as quasi-normal mode (QNM). To clarify physical origin LSPR, we build up analytical model LSPR by considering multiple scattering process propagative polaritons (SPPs) on arms. comprehensively reproduce complex eigenfrequency and field distribution QNMs antenna,...

Spontaneous emission and scattering behavior of an emitter or a resonant scatterer strongly depend on the density states surrounding medium. It has been shown that cross section (RSC) may diverge at Weyl frequency type I system due to diminishing states. Here we study spontaneous (SE) RSC in photonic metacrystal across critical transition between II systems. Theoretical results show SE rate diminishes zero frequency. When is tuned towards point point, dip spectrum becomes infinitely sharp....

An approach for fully vectorial modeling of cylindrical resonators based on the aperiodic Fourier modal method is proposed. The allows efficient and accurate calculations resonant wavelength, quality factor, field whispering-gallery modes rotationally symmetric resonators. validity efficiency are confirmed by converged numerical results with microdisk microring as examples in comparison other approaches.

Abstract Herein, we report the synthesis, characterization, and reactivity of cobalt(I) complexes with an N ‐heterocyclic imino substituted silylene. The hydride complex exhibits high catalytic efficiency chemoselectivity as well good functional group compatibility in hydrogenation olefins.

In periodic systems, band degeneracies are usually protected and classified by spatial symmetries. However, the Gamma point at zero-frequency of a photonic system is an intrinsic degeneracy due to polarization degree freedom electromagnetic waves. We show here that in chiral crystals, such node carries +(-)2 topological charge characters same as spin-1 Weyl manifested triple two linear propagating bands intersecting flat representing electrostatic solution. Such (TDP) buried bulk projections...

Weyl particles exhibit chiral transport property under external curved space-time geometry. This effect is called the gravitational effect, which plays an important role in quantum field theory. However, absence of real nature hinders observation such interesting phenomena. In this paper, we show that can be manifested metamaterials with spatially controlled nonlocality. inhomogeneous modulation results a dependent group velocity cone dispersion, equivalent to introducing background (or...

Abstract Non-Hermitian systems are known for their intriguing topological properties, which underpin various exotic physical phenomena. Exceptional points, in particular, play a pivotal role fine-tuning these optimal device functionality and material characteristics. These points can give rise to exceptional surfaces with embedded lower-dimensional non-isolated singularities. Here we introduce classification non-defective intersection lines of surfaces, where intersect transversally. We...

We propose an intuitive and quantitative model to describe the channel plasmon polaritons (CPPs) guided by a subwavelength rectangular groove cut into metal substrate. The is built up considering multiple scattering process of gap surface plasmons bouncing between mouth bottom groove. can comprehensively reproduce both dispersion relations electromagnetic fields CPPs also decrease computational amount compared full-wave numerical methods. evolution CPP from guided, quasi-guided evanescent...

We propose an analytical model of quasi-normal mode (QNM) for resonant plasmonic nano cavities formed by sub wavelength grooves in metallic substrate. The QNM has shown great advantages understanding and calculating the frequency response nano-structures. With our we show that originates from a resonance fundamental every individual groove its interaction via surface waves. Analytical expression complex eigenfrequency as well field distribution can be derived model. few assumptions on...

We propose a fully-analytical model for the excitation of leaky surface plasmon polariton (SPP) in attenuated total reflection (ATR) configuration under illumination by finite-width beam electromagnetic wave. The is built up on basis general unconjugated-form reciprocity theorem and able to predict amplitude phase SPP at quantitative level. validity carefully supported through comparison with numerical results obtained mode orthogonality. With physical understanding resonant achieved optimal...

We propose a microscopic surface-mode model for the extraordinary optical transmission (EOT) through subwavelength metallic slit array covered with thin dielectric layer under illumination of transverse-electric (TE) polarization. Remarkably, surface plasmon polarizations (SPPs) do not exist this It is commonly believed that waveguide mode in plays role similar to SPP classical EOT. To check intuitive belief, we derive by considering multiple scattering process fundamental and neglecting all...

Abstract Synthesis and reactivity of disilicon(0) complexes are fundamental application importance. Herein, we report the development an N‐heterocyclic imino‐substituted silylene ( 1 ), which has strong σ‐donating ability is significantly sterically hindered. The one‐pot reaction this with [IPr→SiCl 2 ] (IPr=1,3‐bis(2,6‐diisopropylphenyl)‐imidazol‐2‐ylidene) KC 8 (2 equiv) in THF at −30 °C leads to a silylene‐ligated complex isolated as red crystals 60 % yield. Characterization data DFT...

Abstract Recently, artificial photonic structures that exhibit nontrivial topological properties have attracted growing attention due to their capability of achieving one‐way backscatter immune transport light. While crystals are predominantly employed for topologies, effective medium approach based on metamaterials has been recently proposed realizing topologically protected unidirectional surface states. In this article, a microscopic model investigate the transmission metamaterial grating...