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Volume 6 Issue ，2026
Editorial
Abstract：The inability to resolve closely spaced objects fundamentally limits the information accessible to optical imaging systems. In a recent study, a k-space superoscillation framework is introduced as an alternative route to far-field superresolution imaging. By engineering a nonlocal, angle-dependent transmission function, the approach effectively redistributes spatial-frequency content in momentum space, enabling enhanced separation of image features without narrowing the point spread function. Implemented via an inverse-designed multilayer metastructure, the concept is experimentally validated at microwave frequencies, achieving an approximately twofold improvement in resolution. By suppressing real-space sidebands and concentrating energy into the focal region, the k-space approach addresses key limitations of conventional real-space superoscillation. Despite remaining challenges, such as scalability and bandwidth constraints, this work highlights the growing role of inverse design in enabling unconventional optical functionalities and offers a promising pathway toward practical superresolution imaging systems.5|2|0Updated：2026-07-10- Abstract：A hybrid quantum photonic platform integrates cavity-enhanced single-photon emission with metasurface-enabled wavefront control, pointing toward scalable sources of high-dimensional quantum light.8|2|0Updated：2026-07-10
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- Abstract：Hybrid metasurface–refractive systems have often raised concerns about their overall volume and the complexity of mechanical alignment. This reported study presents a fully integrated meta-aspheric optical system that realizes a wide field of view within an ultracompact volume of 0.02 cm3.5|2|0Updated：2026-06-03
- Abstract：Lensless imaging offers a scalable, hardware-light route to optical microscopy but has largely remained structural. In a recent study, Wang et al. demonstrate that molecular specificity can be intrinsically encoded and computationally recovered within a fully lensless framework. This work reframes lensless imaging from scaling structure to encoding function, highlighting an emerging paradigm in which optical simplicity and information completeness are co-designed through optics and computation.6|2|0Updated：2026-05-06
Review
Abstract：Nonlocal flat optics such as photonic crystal slabs, guided-resonance dielectric metasurfaces, and plasmonic lattices use collective Bloch modes and their radiation coupling to achieve sharp spectral selectivity, tailored dispersion, and wavefront control within subwavelength thicknesses. Yet in single-layer platforms, optical functionality is constrained by limited geometric degrees of freedom: in-plane symmetry and pre-patterned geometry largely determine mode structure, while radiation channels, linewidths, and polarization responses are often linked through fixed symmetry-imposed selection rules. Bilayer nonlocal flat-optics platforms break this bottleneck by introducing interlayer degrees of freedom that are independent of the in-plane lattice design, most importantly the interlayer separation (controlling near-field hybridization strength and far-field interference phase), as well as relative translation, twist, and lattice mismatch. This review organizes bilayer nonlocal flat optics by interlayer configurations and highlights the additional design space and reconfigurability uniquely enabled by two coupled flat-optical layers. For example, we connect aligned bilayers to mode hybridization, radiation interference, and high-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$Q$$\end{document} 5|2|0Updated：2026-07-09Research Article
Abstract：Optical skyrmions, particle-like topological textures of light with resilience to perturbation, hold great promise for next-generation robust information carriers. Recent advances have enabled their efficient generation and modulation in both classical and quantum regimes via artificial nanostructures with certain topological landscapes. However, existing studies are largely confined to (quasi)monochromatic domain, because the resonance-based linear and nonlinear light-matter interactions are constrained by narrowband response and strong spectral dispersion. Therefore, the exploration of coloured and white light skyrmions is virtually zero, blocking their extension to broadband information technologies. Here, we present an ultra-compact micro-generator that generates ultra-broadband coloured skyrmions from a natural ferroelectric spherulite crystal through the combined action of the photonic spin-orbital coupling and optical focusing. This approach circumvents the resonance effects intrinsic to artificially nanostructured optical systems. The resulting polychromatic skyrmions cover the entire visible spectral range and can propagate over an appreciable distance in free space. Their topological textures can be continually modulated by tuning the polarization of the incident beam, enabling switching among multiple topologies, such as skyrmions, biskyrmions, and quadrumerons. Furthermore, we reported the experimental evidence of spontaneous parametric down conversion process occurring within the ferroelectric spherulite, which implies the possibility to generate the correlated topological quantum states in further research. These distinctive features will revolutionize modern informatic applications spanning optical communication, data storage, and topological photonic devices.6|2|0Updated：2026-05-11- Abstract：The ultimate non-classic light sources for modern photonic quantum technology require on-demand generation of indistinguishable quantum light with high brightness and flexible engineering of quantum emission in multiple degrees of freedom. In this work, we present monolithic microcavity-metalens interfaces consisting of quantum-dot-micropillar single-photon sources and ultra-thin metalenses accurately aligned on opposite sides of an III-V compound semiconductor chip. The pronounced cavity quantum electrodynamics effect enabled by the micropillar cavity facilitates single-photon emission from quantum dots with simultaneous high degrees of single-photon purity, source brightness and photon indistinguishability while the multi-functional metalenses concurrently tailor quantum emission in multiple physical degrees of freedom including radiation divergence, emission directionality, polarization state and orbital angular momentum (OAM). Furthermore, high-fidelity polarization-OAM entanglement and single photons with local spin topologies are successfully generated in our integrated device. In particular, we demonstrate stable propagations of single-photon skrymions in atmospheric turbulence and reveal their topological advantages over the conventional structured quantum light. Our work advances the research fields of integrated quantum photonics and meta-optics, providing integrated high-dimensional quantum light sources for advanced photonic quantum science and technology.3|2|0Updated：2026-04-23
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Femtosecond dissipative quadratic soliton mode-locking of cavity-enhanced second-harmonic generation
Abstract：Nonlinear frequency conversion underpins numerous classical and quantum photonics applications but conventionally relies on synchronized femtosecond mode-locked lasers and dispersion-engineered enhancement cavities—an approach that imposes substantial system complexity. To address the challenges, here we report a fundamentally different paradigm: mode-locking of nonlinear frequency conversion enabled by the physics of dissipative quadratic soliton (DQS). We present the operating principle of femtosecond DQS mode-locking and experimentally validate it for the first time in a continuous-wave-pumped doubly resonant second-harmonic generator in free space, yielding bichromatic frequency combs spanning the visible and near-infrared. The observed DQSs exhibit 3 dB optical bandwidths and transform-limited pulse durations of 1.15 THz and 274 fs for the pump and 1.13 THz and 279 fs for the second harmonic. By harnessing phase-matched group-velocity-matched cascaded quadratic nonlinearities, we demonstrate an in-situ tunable effective Kerr nonlinearity that exceeds the intrinsic material response by over three orders of magnitude, enabling femtosecond DQS generation in both free-space and chip-scale cavities across normal and anomalous dispersion regimes. Our results establish a simple, flexible, and scalable approach to nonlinear frequency conversion without the need for synchronized femtosecond mode-locked lasers and expand the reach of soliton-based technologies across diverse cavity platforms and a wide range of challenging wavelengths that are otherwise inaccessible.5|2|0Updated：2026-04-14 - Abstract：Quantum nanophotonics offers essential tools and technologies for controlling quantum states, while maintaining a miniature form factor and high scalability. Nanophotonic platforms can transfer information from the traditional degrees of freedom (DoFs) of photons, such as spin angular momentum (SAM) and orbital angular momentum (OAM), to the DoFs of the nanophotonic platform—and back, opening new directions for quantum information processing. Recent experiments have utilized, for entanglement the total angular momentum (TAM) of a photon—as a unique DoF of nanophotonic platforms—for demonstrating entanglement in TAM. Here, we unravel the morphing of quantum states of heralded single photons as they couple into and out of the near-field of a nanophotonic system. Through quantum state tomography, we discover that the TAM state of the near-field transforms to a free-space entangled state within a larger Hilbert space of SAM and OAM. Furthermore, we show that this entangled single photon state is in fact a quantum optical Stokes skyrmion with a topological invariant of
\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\pm 2$$\end{document} Keywords：Nanophotonics;Quantum optics;Quantum skyrmions;Quantum state tomography;Near-field;High-dimensional entanglement;Total-angular momentum6|2|0Updated：2026-04-07
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