The recent research of topological photonics has not only proposed and realized novel phenomena such as one-way broadband propagation robust transport light, but also designed fabricated photonic devices with high-performance indexes which are immune to fabrication errors defects or disorders. Photonic crystals, periodic optical structures the advantages good light field confinement multiple adjusting degrees freedom, provide a powerful platform control flow light. With topology defined in...

Silicon-on-insulator (SOI) enables for capability improvement of modern information processing systems by replacing some their electrical counterparts. With the miniaturization SOI platform, backscattering suppression is one central issues to avoid energy loss and signal distortion in telecommunications. Valley, a new degree freedom, provides an intriguing way topologically robust transfer unidirectional flow light, particular subwavelength strategy that still remains challenge topological...

Topological photonics has been introduced as a powerful platform for integrated optics, since it can deal with robust light transport, and be further extended to the quantum world. Strikingly, valley-contrasting physics in topological photonic structures contributes valley-related edge states, their unidirectional coupling, even valley-dependent wave division junctions. Here, we design fabricate nanophotonic harpoon-shaped beam splitters (HSBSs) based on 120-deg-bending interfaces...

Topological photonics is an emerging field that attracts enormous interest for its novel ways to engineer the flow of light. With help topological protection, surface modes photonic systems have intriguing properties, such as unidirectional propagation, robust transmission against defects and disorders, which meet rapidly growing demands information processing. Valley crystals, one kind systems, not only support protected modes, but also are friendly micro-nano fabrication. These advantages...

Abstract Valley‐Hall photonic topological insulators (VPTIs) provide an intriguing approach to suppress backscattering, enhance the robustness of transport, and shrink footprints devices. However, previous works focused on transmission characteristics symmetric waveguides with few reports functional devices involving edge mode coupling, which hinders implementation various such as optical couplers/splitters, switches, filters, etc. In this paper, a new method manipulate field distributions...

Manipulating radiation asymmetry of photonic structures is particular interest in many applications such as directional optical antenna, high efficiency on-chip lasers, and coherent light control. Here, we proposed a term pseudopolarization to reveal the topological nature bilayer metagratings. Robust vortex with an integer charge exists $P$-symmetry metagrating, allowing for tunable directionality ranging from $\ensuremath{-}1$ 1 synthetic parameter space. When breaking, becomes pairs $C$...

3-dB couplers, which are commonly used in photonic integrated circuits for on-chip information processing, precision measurement, and quantum computing, face challenges achieving robust performance due to their limited bandwidths sensitivity fabrication errors. To address this, we introduce topological physics nanophotonics, developing a framework couplers. These couplers exhibit broad working wavelength range robustness against dimensional By leveraging valley-Hall topology mirror symmetry,...

The recent realization of photonic topological insulators has brought the discovery fundamentally new states light and revolutionary applications such as non-reciprocal devices for diodes robust waveguides routing. spatially distinguished layer pseudospin attracted attention in two-dimensional electronic materials. Here we report layered based on all-dielectric bilayer crystal slabs. introduction offers more dispersion engineering capability, leading to layer-polarized layer-mixed...

In silicon photonics, the cavity mode is a fundamental mechanism to design integrated passive devices for on-chip optical information processing. Recently, corner state in second-order topological photonic crystal (PC) rendered global method achieve an intrinsic mode. It crucial explore such circuits (PICs) under in-plane excitation. Here, we study both theoretically and experimentally nanophotonic silicon-on-insulator PC at telecommunications wavelength. theory, expectation values of...

We present an on-chip filter with a broad tailorable working wavelength and single-mode operation. This is realized through the application of topological photonic crystal nanobeam filters employing synthesis parameter dimensions. By introducing translation air holes as new synthetic dimension, we obtained nanobeams tunable Zak phases. Leveraging bulk-edge correspondence, identify existence cavity modes establish correlation between cavity's interface morphology wavelength. Through...

A method to achieve stable radiation pressure acceleration (RPA) of heavy ions from laser-irradiated ultrathin foils is proposed, where a high-Z material coating in front used. The coated material, acting as moving electron repository, continuously replenishes the accelerating ion foil with comoving electrons light-sail stage due its successive ionization under laser fields Gaussian temporal profile. As result, detrimental effects such deformation and loss induced by Rayleigh-Taylor-like...

Valley photonic crystal is a typical strategy of topological photonics with promising applications for novel integrated waveguides. The valley pseudospin provides an intrinsic paradigm to implement unidirectional coupling robustly optical transport. But the key issue on analysis based modes lack deep understanding crystals. In this work, we systematically study mechanism and performance between waveguides chiral dipole emitters. Forming by two topologically-distinct crystals, there are types...

Chern insulators have been generalized to many classical wave systems and thereby lead potential applications such as robust waveguides, quantum computation high-performance lasers. However, the band structure of a material can be either topologically trivial or non-trivial, depending on how crystal is designed. Here, we propose second in four-dimensional parameter space by introducing two extra synthetic translation dimensions. Since topology bulk bands intrinsically our proposed guaranteed...

Abstract Coupled‐waveguide devices are of central importance in on‐chip photonic circuits. However, their performance usually suffers from high wavelength and structure sensitivity, which makes it challenging to achieve broadband fabrication tolerant optical functions. Topological pumping edge states has emerged as a promising route for robust light transport coupled waveguides. Here, the Thouless process is explored finite Rice‐Mele modeled silicon waveguide arrays power coupling mode‐order...

Microendoscopes are vital for disease detection and clinical diagnosis. The essential issue microendoscopes is to achieve minimally invasive high-resolution observations of soft tissue structures inside deep body cavities. Obviously, the microscope objective a must with capabilities both high lateral resolution in wide field view (FOV) miniaturization size. Here, we propose meta-objective, i.e., based on cascaded metalenses. two metalenses, optical diameters 400 μm 180 μm, respectively,...

Abstract Sharp-bending waveguide is a key element for ultra-compact and densely integrated photonic devices, which promising to enlarge the capability of modern information processing in single chip. Topological photonics manifest nature robust propagation against sharp bending such robustness has been experimentally demonstrated topological interfaces. It important quantify loss interface but remained exclusive. In this work, we report on characterization sharp-bending valley crystals...

Abstract A certain class of photonic crystals with conical dispersion is known to behave as isotropic zero-refractive-index medium. However, the discrete building blocks in such are limited construct multidirectional devices, even for high-symmetric crystals. Here, we show emission from low-symmetric semi-Dirac at zone center. We demonstrate that crystal can be considered an effective anisotropic medium, long there only one propagation mode near Dirac frequency. Four kinds emitters achieved...

Abstract Plasmonic nano‐lasers possess enormous potential for miniaturization of on‐chip integrated light sources. However, achieving plasmonic lasing requires high‐quality resonant cavities, which are currently limited by complex, small‐scale, and costly production methods. Here, a new type external‐cavity free is first presented with ultra‐thin thickness, achieved through the facile spin‐coating quasi‐2D perovskite films onto monocrystalline silver sheets. The exhibit obvious behaviors,...

In photonics, the idea of controlling light in a similar way that magnetic fields control electrons has always been attractive. It can be realized by synthesizing pseudomagnetic (PMFs) photonic crystals (PhCs). Previous works mainly focus on Landau levels and robust transport chiral states. More versatile over using complex nonuniform PMFs such as flexible splitting routing elusive, which hinders their application practical integrated circuits. Here we propose an universal systematic...

We propose a laboratory accelerated test method for study of the atmospheric neutron radiation effects by using compact laser-driven spallation source (LDSNS). The LDSNS is obtained injecting GeV quasimonoenergetic proton beam light-sail (LS) pressure intense lasers into lead target. According to LS scaling law, energy spectra can be regulated adjusting laser and foil target parameters, so that at various altitudes are well reproduced. Integrated PIC MC simulations have verified scheme (for...

Recently, Multimodal Large Language Models (MLLMs) have demonstrated their immense potential in computer-aided diagnosis and decision-making. In the context of robotic-assisted surgery, MLLMs can serve as effective tools for surgical training guidance. However, there is still a lack specialized scene understanding clinical applications. this work, we introduce EndoChat to address various dialogue paradigms subtasks that surgeons encounter. To train our EndoChat, construct Surg-396K dataset...

Abstract Coupled‐waveguide structures are fundamental in photonic integrated circuits for their wide applications basic optical functions such as directional coupling, polarization handling, and mode manipulation. However, the couplings between waveguides usually suffer from high wavelength structure sensitivity, which hinders development of broadband fabrication‐tolerant devices. Here, a new method based on stimulated Raman adiabatic passage (STIRAP) procedure is proposed various kinds...