A microwave ultra-broadband polarization-independent metamaterial absorber is demonstrated. It composed of a periodic array metal-dielectric multilayered quadrangular frustum pyramids. These pyramids possess resonant absorption modes at multi-frequencies, which the overlapping leads to total incident wave over an ultra-wide spectral band. The experimental normal incidence above 90% in frequency range 7.8–14.7 GHz, and kept large when angle smaller than 60°. results agree well with numerical...

Abstract Electromagnetic absorbers have drawn increasing attention in many areas. A series of plasmonic and metamaterial structures can work as efficient narrowband due to the excitation or photonic resonances, providing a great potential for applications designing selective thermal emitters, biosensing, etc. In other such solar‐energy harvesting detection, bandwidth light is required be quite broad. Under background, variety mechanisms broadband/multiband absorption been proposed, mixing...

We design, fabricate, and experimentally demonstrate an ultrathin, broadband half-wave plate in the near-infrared range using a plasmonic metasurface. The simulated results show that linear polarization conversion efficiency is over 97% with 90% reflectance across 800 nm bandwidth. Moreover, experimental indicate such high-efficiency performance also sustained wide of incident angles. To further obtain background-free plate, we arrange as periodic array integrated supercells made several...

We demonstrated an ultra-broadband, polarization-insensitive, and wide-angle metamaterial absorber for terahertz (THz) frequencies using arrays of truncated pyramid unit structure made metal-dielectric multilayer composite. In our design, each sub-layer behaving as effective waveguide is gradually modified in their lateral width to realize a wideband response by effectively stitching together the resonance bands different modes. Experimentally, five layer sample with total thickness 21 μm...

Inspired by the orderly stacked nanostructure and highly integrated function of thylakoids in a natural photosynthesis system, multishell g-C3N4 (MSCN) nanocapsule photocatalysts have been prepared SiO2 hard template with different shell layers. The resultant triple-shell (TSCN) nanocapsules display superior photocatalysis performance to single-shell double-shell counterparts owing excellent visible-light harvesting electron transfer properties. Specially, increase layer number, light is...

Abstract Radiation absorbers have increasingly been attracting attention as crucial components for controllable thermal emission, energy harvesting, modulators, etc. However, it is still challenging to realize thin which can operate over a wide spectrum range. Here, we propose and experimentally demonstrate thin, broadband, polarization-insensitive omnidirectional working in the near-infrared We choose titanium (Ti) instead of commonly used gold (Au) construct nano-disk arrays on top silicon...

Abstract Integration of switchable and diversified functionalities into a single metasurface has become an emerging research area that requires dealing with formidable challenges, especially for terahertz (THz) frequencies. Here, polarization‐insensitive THz metasurfaces are proposed exploit insulator‐to‐metal transition in vanadium dioxide (VO 2 ). The simulations demonstrate the designed can be switched from broadband absorber to reflecting halfwave plate (HWP). At room temperature,...

High-index dielectric nanoparticles supporting a distinct series of Mie resonances have enabled new class optical antennas with unprecedented functionalities. The great wealth multipolar responses has not only brought in physical insight but also spurred practical applications. However, how to make such colorful resonance palette actively tunable is still elusive. Here, we demonstrate that the structured phase-change alloy Ge2Sb2Te5 (GST) can support diverse set active tunability. By...

Abstract Metasurfaces have attracted increasing attention and provide promising solutions for cost‐effective highly efficient optics due to their unprecedented capabilities in light manipulation. In recent years, phase‐change materials (PCMs), especially chalcogenides, are integrated into metasurfaces explore innovative configurations exhibiting remarkable tunability reconfigurability the dramatic optical contrasts available PCMs along with high chemical long‐term stability switching speeds....

Abstract Advances in polarization optics and integrated photonics require fundamentally new polarization‐managing strategies allowing for efficient generation complete control over vectorial fields with well‐defined states using surface‐confined configurations ultracompact footprints extended bandwidths. Recently, metasurfaces have been extensively explored to demonstrate compact planar devices enabling diverse control. However, the main drawback of state‐of‐the‐art metasurface‐based...

Combining piezoelectric MEMS with optical gap-plasmon metasurfaces enables electrically driven dynamic 2D wavefront shaping.

A room-temperature on-chip orbital angular momentum source that emits well-collimated single photons has been demonstrated.

Exceptional points (EPs), unique junctures in non-Hermitian open systems where eigenvalues and eigenstates simultaneously coalesce, have gained notable attention photonics because of their enthralling physical principles properties. Nonetheless, the experimental observation EPs, particularly within optical domain, has proven rather challenging grueling demand for precise comprehensive control over parameter space, further compounded by necessity dynamic tunability. Here, we demonstrate...

We propose and demonstrate a new SERS substrate architecture that couples dense three-dimensional (3-D) cavity nanoantenna array, through nano-gaps, with plasmonic nanodots; nanofabrication combines nanoimprint, guided self-assembly self-alignment has fabricated the precisely, simply, inexpensively over large area (4-inch wafer). experimentally achieved not only high area-average enhancement (1.2×10⁹) but also excellent uniformity (22.4% variation) at same time entire large-area sample by...

Integration of multiple diversified functionalities into a single, planar and ultra-compact device has become an emerging research area with fascinating possibilities for realization very dense integration miniaturization in photonics that requires addressing formidable challenges, particularly operation the visible range. Here we design, fabricate experimentally demonstrate bifunctional gap-plasmon metasurfaces light, allowing simultaneous polarization-controlled unidirectional surface...

This review presents an overview about graphitic carbon nitride-based nanocomposites as visible-light driven photocatalysts for environmentally relevant applications.

Protein detection is universal and vital in biological study medical diagnosis (e.g., cancer detection). Fluorescent immunoassay one of the most widely used sensitive methods protein (Giljohann, D. A.; Mirkin, C. A. Nature2009, 462, 461-464; Yager, P.; et al. Nature2006, 442, 412-418). Improvements such assays have many significant implications. Here, we report use a new plasmonic structure molecular spacer to enhance average fluorescence an A human immunoglobulin G (IgG) by over 7400-fold...

Abstract Light absorbers have drawn intensive attention as crucial components for solar‐energy harvesting, thermal emission tailoring, modulators, etc. However, achievement of light with wide bandwidth remains a challenge thus far. Here, thin, unprecedentedly ultrabroadband strong absorber is proposed and experimentally demonstrated, which consists periodic taper arrays constructed by an alumina–chrome multilayered metamaterial (MM) on gold substrate. This MM can change from hyperbolic...

Plasmon-enhanced upconversion luminescence of NaYF4: Yb3+/Er3+ co-doped nanocrystals is investigated using a 3D plasmonic antenna architecture: disk-coupled dots-on-pillar array (D2PA). By tuning and optimizing the resonance frequency D2PA structure for luminescence, 310-fold enhancement an 8-fold reduction decay time are observed.