Non-Hermitian systems with complex-valued energy spectra provide an extraordinary platform for manipulating unconventional dynamics of light. Here, we demonstrate the localization light in instantaneously reconfigurable non-Hermitian honeycomb photonic lattice that is established a coherently prepared atomic system. One set sublattices optically modulated to introduce absorptive difference between neighboring sites, where Dirac points reciprocal space are extended into dispersionless local...

Asymmetric microcavities supporting Whispering-gallery modes (WGMs) are of great significance for on-chip optical information processing. We define asymmetric on topologically curved surfaces, where the geodesic light trajectories completely reconstruct cavity mode features. The quality factors lossy chaotic and island in flat cavities can be increased by up to ~200 times space curvature. Strong weak coupling between very different origins occur when curvature brings them into resonance,...

We have experimentally demonstrated the realization of an instantaneously reconfigurable Lieb photonic lattice with a flatband in three-level Λ-type rubidium atomic configuration. Such coherently controllable is optically induced by coupling field possessing spatially periodic intensity distribution (generated via spatial light modulator) under condition electromagnetically transparency. The incident weak Gaussian probe can experience discrete diffraction and observed beam at output surface...

We demonstrate the realization of an anti-parity-time (PT)-symmetric photonic lattice in a coherent three-level Λ-type 85Rb atomic system both experimentally and theoretically. Such instantaneously reconfigurable anti-PT-symmetric is "written" by two one-dimensional coupling fields, which are arranged alternately along x direction can modulate refractive index vapor spatially periodical manner via controllable coherence. By properly adjusting relevant parameters, phase shift between adjacent...

Abstract Currently the main method of mine solid waste disposal and utilization is to apply gangue underground filling. For grading characteristics coal in hollow zone filling, state pressure mechanical properties filling materials under different particle sizes. In this paper, through laboratory tests numerical simulations, bearing deformation damage are deeply investigated analyzed from both macroscopic microscopic perspectives. The results study show that when axial reaches a certain...

In this paper, the tensile deformation behaviors of polycrystals after relaxation were studied using phase-field-crystal (PFC) method. Here, free energy density map characterized 2D distribution atomic configuration effectively. The application Read–Shockley equation distinguished high-energy grain boundary (HEGB) and low-energy (LEGB) in large-angle (LAGB), they demonstrated different migration at early later stages. small-angle (SAGB), including its grains’ rotation, also studied. Two...

We demonstrate the transition of band structure from flatband to type-III Dirac cones in an electromagnetically induced Kagome photonic lattice generated a three-level Λ-type

In recent years, the development trend of artificial intelligence is getting better and better. It has been widely used not only in fields big data analysis, automobile automatic driving, intelligent robot face recognition, but also various oil gas industry. Oil production prediction an important part reservoir engineering, which very for future strata, can give developers some suggestions. At present, methods are mainly traditional means such as numerical simulation history matching. With...

A 2D Kagome photonic lattice possesses special band structures involving a flat that allows the localization state and Dirac cones show linear dispersion. Here, we report construction of an instantaneously reconfigurable electromagnetically induced in Λ-type 85 Rb atomic configuration theoretically experimentally under condition transparency, which is excited by weak Gaussian probe field strong coupling with intensity profile. The incident discretely diffracted into profile inside vapor cell...

The illusion effect requires the establishment of same scattering properties. Conventionally, is realized by a device that larger than target object, but minimum size has not been discussed in literature. Here, we first realize an with metasurface smaller object. This achieved obtaining desired electromagnetic fields inside object and constructing surface-impedance metasurface. Then, more importantly, discuss such devices. Our results show related to size, material, fine structures objects....

Topological physics has broadened its scope from the study of topological insulating phases to include nodal containing band structure singularities. The geometry corresponding quantum states is described by metric which provides a theoretical framework for explaining phenomena that conventional approaches fail address. field become even broader encompassing non-Hermitian singularities: in addition Dirac, Weyl nodes, or lines, it now common encounter exceptional points, rings, and spheres....

We experimentally investigate the coherently controllable generation and annihilation of a pseudospin-induced optical vortex in an optically induced honeycomb photonic lattice Λ-type 85 Rb atomic vapor cell. Three Gaussian coupling beams are coupled into gases to form hexagonal interference pattern, which can induce under electromagnetically transparency. Then, two probe interfere with each other periodical fringes cover one set sublattice lattice, corresponding excite K or K′ valleys...

Magnetic-free nonreciprocal optical devices that can prevent backscattering of signals are essential for integrated information processing. The achieved behaviors mostly rely on various dispersive effects in media, which give rise to modulations the transverse beam profile, such as spatial broadening and discretization, incident signals. Such deformation inevitably reduces matching with subsequent components Here we experimentally demonstrate localization light a moir\'e photonic lattice...

Non-Hermitian systems with complex-valued energy spectra provide an extraordinary platform for manipulating unconventional dynamics of light. Here, we demonstrate the localization light in instantaneously reconfigurable non-Hermitian honeycomb photonic lattice that is established a coherently-prepared atomic system. One set sublattices optically modulated to introduce absorptive difference between neighboring sites, where Dirac points reciprocal space are extended into dispersionless local...

Abstract Single‐mode laser is of fundamental importance due to its beam quality and spectral purity. However, common lasers operate in multimode as the dimensions most resonators are much larger than operating wavelengths. Herein, novel dual‐wavelength single‐mode lasing from a solution self‐assembled single‐component microbelt that consists excited‐state intramolecular proton transfer molecules demonstrated. The large modulation gain regimes cooperative effect between loss cavity proven...

In the present work, first (1st) and second (2nd) nearest-neighbor interaction energies are calculated by coupling microscopic phase-field kinetic model with calculation of phase diagrams (CALPHAD) method. The morphological evolution γ′ precipitate variation its atomic ordering parameter for Ni–X (X = Al, Fe, Mn, Pt, or Si) alloys during aging studied. simulation results predict different occupation preferences solute solvent atoms in phase, i.e., inclined to occupy corner sites tend face...

Abstract GH4169 super alloy has a wide application in the field of aeronautics and astronautics, order to realize high quality fast processing complex workpieces with electrochemical machining (ECM), we have studied dissolution characteristics composite electrolyte, explored rule influence on voltage, feed speed, electrolyte pressure for gap (SG), material removal rate (MRR) surface roughness (Ra). The results showed that under 10%NaCl+16%NaNO3+4%NaClO3, 17.5V voltage 0.8MPa; temperature...

Conventionally, the illusion effect is realized by a device that larger than object. In this paper, we discuss possibility of realizing with smaller This achieved obtaining desired fields in region and constructing surface impedance metasurfaces. Simulation results are performed they successfully verified proposed scheme.

Microcavities supporting Whispering-gallery modes (WGMs) are of great significance for on-chip optical information processing, which is frequently analyzed using ray dynamics that conventionally involves straight light trajectories in flat space. We develop a novel mathematical model allows investigating photon movement WGM-microcavities defined on curved surfaces, consists or twisted following the geodesic lines show resulting differs dramatically from those microcavities, and various...

An experimental system has been designed and built to study the electrical characteristics in an asymmetric capacitive coupled radio frequency (RF) discharge excited copper ion laser at moderate gas pressures. The consists of chamber, thru-line integrated voltage current probe, matching circuit measurement system. There are some results measurements carried out a helium 13.56 MHz. Although this specifically measure parameter RF-excited moderate-pressure gas, it can operate over wide range...

Asymmetric microcavities supporting Whispering-gallery modes (WGMs) are of great significance for on-chip optical information processing. We define asymmetric on topologically curved surfaces, where the geodesic light trajectories completely reconstruct cavity mode features. The quality factors lossy chaotic and island in flat cavities can be increased by up to ~200 times space curvature. Strong weak coupling between very different origins occur when curvature brings them into resonance,...