We propose to use transformation optics generate a general illusion such that an arbitrary object appears be like some other of our choice. This is achieved by using remote device can transform the scattered light outside virtual boundary into chosen for illusion, irrespective profile and direction incident light. type also enables people see through walls. Our work extends concept cloaking as special form wider realm optics.

Photonic topological insulators protected by the lattice spatial symmetry (e.g., inversion and rotation symmetry) mainly support single type edge state, interpreted either valley or pseudo-spin. Here, we demonstrate theoretically, numerically, experimentally that a of judiciously designed two-dimensional Kekulé photonic crystal with time reversal can possess pseudo-spin states in different frequency bands. Topologically robust transportation both was confirmed measuring transmission straight...

We present calculations of the optical force on heterodimer two gold nanorods aligned head-to-tail, under plane wave illumination that is polarized along dimer axis. It found near dipole-quadrupole Fano resonance, binding between reverses, indicating an attractive to repulsive transition. This in contrast homodimer which similar configuration shows no negative force. Moreover, spectrum features asymmetric line shape and shifts accordingly when resonance tuned by varying length or their gap....

We report on the generation of dual-wavelength mode-locked pulses in an erbium-doped fiber laser incorporating a topological insulator (TI): Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> /Polyvinyl Alcohol (PVA) film which could operate as both excellent saturable absorber (SA) for mode-locking and high-nonlinear medium mitigating mode competition stabilizing oscillation. The TI:...

Inversion symmetry breaking and spin–orbit coupling result in spin-splitting of both valence conduction bands transition metal dichalcogenide (TMDC) monolayers. The optical transitions between band edges with opposite spins are termed dark excitons that decoupled in-plane polarized photons. Here, we find the presence modifies temperature-dependent plasmon–bright-exciton strength a TMDC monolayer interacting single plasmonic nanocavity. Quite interestingly, observe modifications an manner for...

Abstract Previous studies on the propagation direction of valley topological edge states mainly focus matching between orbital angular momentum excitation source and specific pseudo-spin state mode at certain frequency that falls in bandgap topologically distinct bulk components. In this work, we propose photonic crystals (PCs) hosting two protected bandgaps. It is shown by constructing interface different PC structures with phase, can be engineered inside these bandgaps, which provides a...

We study the optical far-field and near-field characteristics, force effects of plasmonic disk-ring nanostructures. There are multiple Fano features resulting from scattering interferences hybridized modes disk's dipole ring's higher-order modes. In particular, it is found that binding between disk ring shows sign reversals spectrally, dipole-quadrupole regime up to dipole-decapole regime. show zero-force points can be categorized into two types: positive-to-negative ones dip...

Recently, it was demonstrated that active sources can be used to cloak any objects lie outside the cloaking devices [Phys. Rev. Lett. \textbf{103}, 073901 (2009)]. Here, we propose create illusion effects, so an object device made look like another object. invisibility is a special case in which concealed transformed volume of air. From boundary element perspective, show nearly "silent" domain conceal inside and at same time make whole system our choice virtual boundary. The method gives...

Plasmonic nanoantennas, the properties of which are essentially determined by their resonance modes, interest both fundamentally and for various applications. Antennas with shapes, geometries, compositions have been demonstrated, each possessing unique potential Here, we propose use a sidewall coating as an additional degree freedom to manipulate plasmonic gap cavity modes in strongly coupled metallic nanodisks. It is demonstrated that dielectric middle layer thickness few tens nanometers...

Abstract In recent years, the development of perovskite solar cells (PSCs) is advancing along way, and efficiency comparable to traditional silicon‐based cells. However, as crucial factors in road commercialization, stability upscaling manufacture have not been fully investigated yet. To solve these problems, exploration charge transport layer (CTL) clearly imminent, which critical PSCs. Among them, inorganic metal oxides better than organic CTL. Particularly, atomic deposition (ALD) process...

We propose and study a kind of bilayered chiral metasurface (BCM) composed complementary L-shaped resonators with lossless dielectric spacer that can realize linear polarization rotation ultrahigh conversion efficiency. present theoretical analysis the BCM specific geometry enables asymmetric transmission for only. Numerical results show proposed has dual-band nearly 100% cross-polarization efficiency when loss is ignored. More importantly, depending on incident direction, only one...

High-index dielectric nanoantennas have become an emerging branch of optical nanoantennas, essentially due to their low loss. These types can achieve both forward and backward unidirectional scattering, enabled by electric dipole magnetic interaction. Here, we show that the scattering directionality be further enhanced if higher-order moments are properly balanced reach generalized Kerker condition at two different wavelengths in all-dielectric hollow nanodisk. Moreover, putting nanodisks...

Due to the abilities of manipulating wavefront light with well-controlled amplitude, and phase polarization, optical metasurfaces are very suitable for holography, enabling applications multiple functionalities high data capacity. Here, we demonstrate encoding two- three-dimensional full-color holographic images by an ultrathin metasurface hologram whose unit cells subwavelength nanoslits spatially varying orientations. We further show that it is possible achieve multiplexing such kind...

The square-root operation can generate systems with new (to the best of our knowledge) topological phases whose properties are inherited from parent Hamiltonian. In this Letter, we introduce concept topology in two-dimensional (2D) Su–Schrieffer–Heeger (SSH) model and construct a square nanoparticle lattice (SRTL) by inserting additional sites into original 2D SSH model. We find that states SRTL intriguingly different those corresponding (with on-site potential) due to change symmetrical...

Chiral edge states (CESs) have been demonstrated at the external boundary of a valley photonic crystal (VPC), with flexibly tunable group velocity and frequency range by adjusting structure. In this work, we show parallel antiparallel CESs located two opposite VPC-air boundaries, which contain wave components belonging to valleys or same valley. addition, design meta-structure four types air-contacted that support in different ranges. The structure also has an internal interface channel...

Second-order topological insulators can be characterized by their bulk polarization, which is believed to intrinsically connected the center of Wannier function. In this study, we demonstrate existence second-order that feature a pair partially degenerate photonic bands. These arise from nonsymmorphic glide symmetry in an all-dielectric crystal. The maximally localized function (MLWF) consistently located at origin but not equivalent with respect sum constituent polarizations. As result,...

Purpose The purpose of this study is to improve the accuracy industrial robot kinematic parameter identification and position by solving problem insufficient consideration error sources in model optimizing selection measurement pose set. Design/methodology/approach In study, a calibration method for robots considering multiple proposed. Based on Modified Denavit Hartenberg (MD-H) model, kinematics including joint reduction ratio error, target ball installation coordinate system...

Abstract Diffractive optical neural networks (DONNs) offer high‐speed, energy‐efficient artificial intelligence (AI) computation but face challenges with misalignment and model‐to‐reality gaps. In this work, an ultra‐simplified DONN architecture based on a digital mirror device (DMD) camera, dubbed as m‐DONN, is introduced experimentally validated. Notably, within the m‐DONN framework, DMD acts both input layer solitary hidden layer, which trained 2‐level quantization, markedly differing...