Perfect absorbers are important optical/thermal components required by a variety of applications, including photon/thermal-harvesting, thermal energy recycling and vacuum heat liberation. While there is great interest in achieving highly absorptive materials exhibiting large broadband absorption using optically thick, micro-structured materials, it still challenging to realize ultra-compact subwavelength absorber for on-chip applications. Here we report the experimental realization an super...

The recent reported trapped "rainbow" storage of light using metamaterials and plasmonic graded surface gratings has generated considerable interest for on-chip slow light. potential controlling the velocity broadband in guided photonic structures opens up tremendous opportunities to manipulate optical modulation, switching, communication light-matter interactions. However, previously designs rainbow trapping are generally constrained by inherent difficulties resulting limited experimental...

A fundamental strategy is developed to enhance the light-matter interaction of ultra-thin films based on a strong interference effect in planar nanocavities, and overcome limitation between optical absorption film thickness energy harvesting/conversion materials. This principle quite general applied explore spectrally tunable enhancement various absorptive materials including 2D atomic monolayers.

A fiber-optic surface plasmon resonance (SPR) sensor for temperature detection has been proposed by utilizing a thermosensitive liquid as the intermediate and combining with fiber SPR structure. The sensing element of fabricated packaging probe coated silver layer into capillary filled anhydrous ethanol. This can protect metal from oxidation damage. Moreover, this achieves sensitivity 1.5745 nm/°C, which is much higher than that traditional according to comparative experiments.

A new refractive index (RI) sensor based on multi-tapered single mode-multimode-single mode (SMS) fiber structure is proposed. The fabricated by tapering several tapers in multimode part of the SMS structure. In taper region, evanescent wave generated and permeates to surrounding liquid. Thus, sensitive RI variation sensing characteristic investigated theoretically experimentally. Through fabricating three tapers, five eight it can be concluded that more higher measuring sensitivity....

Slow light in photonic crystal waveguide (PCW) is now being heavily investigated for applications optical devices. However, slow with high group index perfect PCW usually accompanied by large velocity dispersion (GVD), which would severely limit the bandwidth of light, deform pulses, and disturb its practical applications. In this review, various optimization methods that are proposed to overcome these drawbacks introduced compared. These rely largely on ability modify properties PCWs a...

Chirality describes not only the structural property of three-dimensional objects, but also an intrinsic feature electromagnetic fields. Here we report a strategy to realize Bessel beam superchiral "needle" by focusing twisted radially polarized on planar dielectric interface. By tailoring light spatial distribution in pupil plane high numerical aperture lens, chirality local field at focus can be enhanced 11.9-fold than that circular beam. Through combined interaction chiral and achiral...

We report on the optical and physical characterization of metallic nanowire (NW) metamaterials fabricated by electrodeposition ≈30 nm diameter gold nanowires in nanoporous anodic aluminum oxide. observe a uniaxial anisotropic dielectric response for NW that displays both epsilon-near-zero (ENZ) epsilon-near-pole (ENP) resonances. show fundamental difference behavior from metal-dielectric multilayer (ML) is differing directions ENZ ENP responses relative to axis effective tensor. In contrast...

Fiber specklegram sensors do not rely on complex fabrication processes and expensive sensor interrogation schemes provide an alternative to routinely used fiber sensing technologies. Most of the reported demodulation focus correlation calculation based statistical properties or classification according features, resulting in limited measurement range resolution. In this work, we propose demonstrate a learning-empowered spatially resolved method for bending sensors. This can learn evolution...

Light propagating through multimode fibers experiences multiple scattering, leading to complex speckle output patterns and significant dispersion. In this work, we propose a unique light state called the spectral-spatially correlated principal mode (S 2 mode) in fibers. This demonstrates an ability simultaneously manipulate spectral correlation spatial distribution of field under strong coupling. Such simultaneous control over dimensions is achieved measuring generalized Wigner-Smith...

In recent years, research on chiral bound states in the continuum (BIC) has surged, leading to development of various metasurfaces with narrow bandwidths by breaking in-plane and out-of-plane symmetries. However, ability dynamically tune working band remains relatively unexplored, which is valuable for sensing applications. Optical phase-change materials, tunable dielectric constants switchable properties during phase transition, offer potential dynamic control optical metasurfaces. This...

Chiral materials are vital in various fields like physics, chemistry, and life sciences. Enhancing the interaction between light chiral is crucial for advancements these areas. We can manipulate chirality-dependent by designing microstructural particles tailoring incident fields. Compared to photonic structures, study of engineered optical relatively underexplored, yet it has recently been recognized as a novel approach manipulating light–matter interactions. In this study, we propose method...

The identification of key nodes has garnered considerable attention across various research domains, including commercial marketing, infectious disease prevention and control, road network optimization, intelligent electricity management, Chinese medicine formulation design. To evaluate critical within complex networks, numerous algorithms have been proposed. However, these methods exhibit certain limitations such as one-sided considerations single evaluation indexes. Consequently, the...

Abstract Suppressing scattering‐induced glare is essential for enhancing the detection capabilities of weak objects. While wavefront shaping techniques have shown promise in achieving suppression, existing methods often rely on time‐consuming iterative feedback processes and struggle to address distortions caused by dispersion. Here, a novel glare‐suppressed principal mode capable simultaneously suppressing both dispersion dispersive media presented experimentally demonstrated. This approach...

Optical field can be concentrated into deep‐subwavelength volumes and realize significant localized‐field enhancement (so called “hot spot”) using metallic nanostructures. It is generally believed that smaller gaps between nanopatterns will result in stronger localized due to optically driven free electrons coupled across the gap. However, it challenging squeeze light extreme dimensions with high efficiencies mainly conventional optical diffraction limit. Here a metamaterial super absorber...

In this paper, a learning-based fiber specklegram sensor for bending recognition is proposed and demonstrated. Specifically, since the curvature-induced variations of mode interference in optical fibers can be characterized by speckle patterns, Resnet18, classification model based on convolutional neural network architecture with excellent performance, used to identify state disturbed position simultaneously according patterns collected from distal end multimode fiber. The feasibility scheme...