Metasurfaces of quarter-wave plate (QWP) meta-atoms have exhibited high flexibility and versatile functionalities in the manipulation of light fields. However, the generation of multi-channel vortex beams with the QWP meta-atom metasurfaces presents a significant challenge. In this study, we propose dielectric metasurfaces composed of QWP meta-atoms to manipulate multi-channel vortex beams. QWP meta-atoms, systematically arranged in concentric circular rings, are designed to introduce the modulations via the propagation phase and geometric phase, leading to the generation of co- and cross-polarized vortex beams in distinct channels. Theoretical investigations and simulations are employed to analyze the modulation process, confirming the capability of QWP meta-atom metasurfaces for generating the multi-channel vortex beams. This study presents prospective advancements for the compact, integrated, and multifunctional nanophotonic platforms, which have potential applications in classical physics and quantum domains.

NaNbO₃(NN)-based lead-free materials are attracting widespread attention due to their environment-friendly and complex phase transitions, which can satisfy the miniaturization and integration for future electronic components. However, NN materials usually have large remanent polarization and obvious hysteresis, which are not conducive to energy storage. In this work, we investigated the effect of introducing CaTiO₃((1−x)NaNbO₃-xCaTiO₃) on the physical properties of NN. The results indicated that as x increased, the surface topography, oxygen vacancy and dielectric loss of the thin films were significantly improved when optimal value was achieved at x = 0.1. Moreover, the 0.9NN-0.1CT thin film shows reversible polarization domain structures and well-established piezoresponse hysteresis loops. These results indicate that our thin films have potential application in future advanced pulsed power electronics.

Vortex beams, characterized by their helical phase wavefronts, hold great promise in optical information science and light-matter interactions. However, current research predominantly focuses on static transverse properties, leaving a critical knowledge gap in the longitudinal mechanisms. This study systematically investigates the longitudinal evolution of vortex beams by constructing a nested spiral array configuration with gradient-distributed topological charges. Through a wavefront modulation scheme and a parametric topological charge regulation, we established a theoretical framework for longitudinal vortex field propagation, enabling quantitative characterization of annular intensity profiles, phase evolution patterns, and topological state transitions. Numerical simulations reveal propagation-dependent intensity enhancement followed by attenuation, while the phase maintains azimuthal rotational symmetry. Notably, the topological charge manifests a stepwise decrement pattern proportional to the spiral array number. This multidimensional vortex modulation mechanism provides theoretical foundations for advancing orbital angular momentum multiplexing technologies and developing multiple degree of freedom manipulation systems for microparticles in optical tweezers.

Optical Lattices are evolving from an information carrier to a programmable medium in which topology, structure and propagation are dynamically coupled. Here we investigated longitudinal manipulation of optical lattices generated by a six-aperture spiral array whose azimuthal phase is imprinted with a topological charge l. By varying l from 1 to 7 in simulations, we sculpted the longitudinal lattices into Hexagonal, Kagome and Honeycomb structures whose transverse phase profiles are uniquely encoded by topological phase configurations. The results demonstrated that the phase profiles execute a longitudinal pulsation, while all higher-order vortices converge to a stable zero state after a geometry-dependent length z. During the longitudinal variations, the measured phase-lattice exhibits the correspondences of 6π-Honeycomb, ±4π-Kagome, and ±2π-Hexagon, enabling predictive design of reconfigurable photonic crystals and topologically protected registers. Our results establish the six-aperture spiral as a compact diffractive engine for coherent lattice reconfiguration and open a route to longitudinal light-matter interfaces.

The predecessor of China Optics was China Optics and Applied Optics Digest, which was founded in 1985. At that time, it was the only retrieval journal in the field of optics in China. At the end of 2008, China Optics and Applied Optics Digest was renamed 《中国光学》的前身是1985年创办的《中国光学与应用光学文摘》，当时是国内光学领域唯一的检索刊物。2008年底《中国光学与应用光学文摘》转型更名为《中国光学与应用光学》期刊，刊载内容突破了文摘的限制，正式成为学术刊物。