We propose to achieve multi-band perfect plasmonic absorptions with peak absorptivity >99% via the excitation of standing-wave graphene surface plasmon polaritons using single-layer graphene-based rectangular gratings. For case continuous gratings, are only allowed for even-order modes, while quite low odd-order modes because fields out-of-phase. However, gratings bottom-open configuration, four-band containing both even- and can be realized, which found highly sensitive incident angle. The...

The best of both worlds: Multifunctional Fe3O4@[email protected] shell nanoparticles (see scheme; Fe3O4 is black, polymer blue, gold brown) display good dispersibility and stability in aqueous solution. Strong magnetization NIR absorption are preserved the core–shell structures. These features should facilitate biomedical applications, combining benefits MRI diagnosis, magnetically targeted delivery, photothermal ablation. Supporting information for this article available on WWW under...

In this paper, a bulk Dirac semimetals (BDSs) based tunable narrowband absorber at terahertz frequencies is proposed and it has the attractive property of being polarization-independent normal incidence because its 90° rotational symmetry. Numerical results show that absorption bandwidth about 1.469e-2 THz total quality factor Q, defined as Q = f0/Δf, reaches 94.6, which can be attributed to low power loss guided mode resonance in dielectric layer. The simulation are analyzed with coupled...

Abstract For the attractive plasmonic structure consisting of metal nanoparticles (NPs) on a mirror, coexistence near-field NP-NP and NP-mirror couplings is numerically studied at normal incidence. By mapping their 3D surface charge distributions directly, we have demonstrated two different kinds mirror-induced bonding dipole plasmon modes confirmed hybridizations mirror NP-dimer which may offer much stronger enhancement than that isolated NP dimers over broad wavelength range. Further, it...

Abstract Silver nanostructures have been considered as promising substrates for surface-enhanced Raman scattering (SERS) with extremely high sensitivity. The applications, however, are hindered by the facts that their morphology can be easily destroyed due to low melting points (~100 °C) and surfaces readily oxidized/sulfured in air, thus losing SERS activity. It was found wrapping Ag nanorods an ultrathin (~1.5 nm) but dense amorphous Al 2 O 3 layer low-temperature atomic deposition (ALD)...

An approach to capture light efficiently into graphene surface plasmons by patterning the sinusoidal dielectric metasurfaces above and below sheet is proposed. The presence of plasmonic resonance demonstrated means an analytical model based on transformation optics through extraction effective conductivity, which further revealed via a numerical study optical spectra as function grating parameters at subwavelength scale. Besides, resonant position found be sensitive contacted with graphene....

Abstract TiO 2 -coated Ag nanorods (Ag@TiO NRs) have been fabricated as multifunctional surface-enhanced Raman scattering (SERS) substrates. Uniform shells could sufficiently protect the internal NRs against oxidation and sulfuration, thus temporal stability of SERS substrates was markedly improved. Meanwhile, due to synergetic effect between crystalline Ag, nanocomposites clean themselves via photocatalytic degradation adsorbed molecules under ultraviolet irradiation water dilution, making...

Given that the high incidences of fruit mildew especially for strawberry and cherry during storage, green, edible, antifungal package materials was greatly required to improve shelf-life. Herein, an active film encapsulating Zanthoxylum bungeanum essential oil (ZBEO, 10%) into polyvinyl alcohol/β-Cyclodextrin (PVA/β-CD, 6:1) nanofibers fabricated via electrospinning technology, based on specific process optimization. ZBEO/Film composing (∼185 nm average diameter) exhibited adequate...

The near-field resonance shift of metallic nanosphere dimers decays nearly exponentially as the gap size increases, with a lower decay length than that for far-field shift.

Ag nanorods coated with an ultrathin HfO2 shell (Ag NRs@HfO2) were prepared for the synthesis of a versatile, robust, and easily recyclable surface-enhanced Raman scattering (SERS) substrate. This substrate maximizes high melting point thus ensures excellent plasmonic efficiency NRs. Therefore, it possesses extraordinary thermal stability SERS activity, which could act as reusable cost-effective detector. After detection, regeneration NRs@HfO2 was achieved by annealing within several...

Mal mehr, mal weniger: Goldnanopartikel (NPs) auf Upconversion-Nanokristallen (NCs) führen zu Plasmonenwechselwirkungen, die eine Verstärkung der Upconversions-Emission von über 2.5 bewirken. Umgekehrt unterdrückt Bildung einer Goldschale wegen Streuung Anregungsstrahlung NC-Emission deutlich (siehe Bild; a: NCs vor Anbindung Keimen; b,c: mit Gold-NPs; c: NC Goldschale; Maßstab: 50 nm).

We report the formation of single crystal MnSi nanowires, MnSi/Si/MnSi nanowire heterostructures, to study spin transport in silicon nanostructure. Scanning electron microscopy studies show that nanowires can be converted into through controlled solid-state reaction. High-resolution transmission microscope heterostructures have clean, atomically sharp interfaces with an epitaxial relationship Si[311]//MnSi[120] and Si(345)//MnSi(214). Magnetoresistance (MR) exhibits metallic behavior...

We present a careful numerical study of nanoparticle (NP) faceting, highlighting the great influence small morphological changes NP-mirror cavities on near-field enhancement in nanoparticle-on-mirror (NPOM) system. Using 3D finite element method (FEM) plasmon mapping method, active transverse cavity modes can be confirmed. For dominant mode, we have found that, by increasing facet width, resonance tuned linearly to red with little decrease peak intensity. It is further demonstrated that NP...

Beyond the ideal nanosphere dimer hotspot model, small morphology variations can have great influences on plasmonic properties.

To address the challenges of food waste disposal and promote carbon emission reduction, this study synthesizes hydrogels using nano-calcium peroxide (nano-CaO2) as an oxidant to activate components in waste. With acrylamide (AM), cross-linking agent N,N′-methylene bisacrylamide (MBA), initiator sodium persulfate (SPS), were formed via oxidative excitation free-radical polymerization. A one-factor experiment investigated factors affecting hydrogel preparation, while a four-factor, three-level...

Accurate spectral and radiometric calibration is critical for precise Solar Spectral Irradiance (SSI) Aerosol Optical Depth (AOD) retrievals in ground-based observations. This study introduces a pixel-based real-time noise deduction method evaluates its performance using laser sources, Fraunhofer dark lines, an improved Langley plot calibration. The proposed approach addresses challenges long-term field SSI monitoring, including variation frequent requirements wavelength responsivity...

Abstract Biodegradable poly(lactic acid)/poly(butylene adipate‐co‐terephthalate) (PLA/PBAT) blends have poor compatibility, and reactive compatibilization is the most effective approach to improve their compatibility. In this study, lysine diisocyanate (LDI) employed as a compatibilizer interfacial interactions within PLA/PBAT at various ratios (30/70, 50/50, 70/30). The effects of LDI on mechanism, thermodynamic behavior, mechanical properties, phase morphology are thoroughly investigated....

Folding straight Ag nanorods into zig-zag structures could generate corners or bends that become potential hot spots for surface-enhanced Raman scattering (SERS). Using a dynamic shadowing growth method, silver nanorod arrays of different bending number N with fixed total rod length are fabricated, and their SERS performance measured compared using the probe Rhodamine 6G. The intensity increases when < 4 decreases > 4. results suggest folding three-dimensional is promising way...

For subwavelength closely spaced Au nanorod arrays, the continuous dependence of individual SERS peak heights on Stokes Raman shift has been visualized and further clarified.