Recent experiments have evidenced sub-nanometer resolution in plasmonic-enhanced probe spectroscopy. Such a high cannot be simply explained using the commonly considered radii of metallic nanoparticles on plasmonic probes. In this contribution effects defects as small single atom found spherical particles acting probing tips are investigated connection with spatial provided. The presence abundant edge and corner sites atomic scale dimensions crystalline is evident from transmission electron...

We provide a comprehensive description of the defect tolerance sodium-borosilicate glasses upon sharp contact loading. This is motivated by key role which taken this particular glass system in wide variety applications, ranging from electronic substrates, display covers and substrates for biomedical imaging sensing to, e.g., radioactive waste vitrification. The present report mechanical properties Na2O–B2O3–SiO2 ternary over broad range compositions pure SiO2 to binary sodium-borates,...

We report on the magneto-optical (MO) properties of heavily Tb(3+)-doped GeO2-B2O3-Al2O3-Ga2O3 glasses towards fiber-integrated paramagnetic MO devices. For a Tb(3+) ion concentration up to 9.7 × 10(21) cm(-3), reported glass exhibits an absolute negative Faraday rotation ~120 rad/T/m at 632.8 nm. The optimum spectral ratio between Verdet constant and light transmittance over window 400-1500 nm is found for ~6.5 cm(-3). this glass, crystallization stability, expressed as difference...

Optical fiber micro-tips are promising devices for sensing applications in small volume and difficult to access locations, such as biological biomedical settings. The tapered tips prepared by dynamic chemical etching, reducing the size from 125 μm just a few μm. Focused ion beam milling is then used create cavity structures on tips. Two different Fabry-Perot micro-cavities have been characterized: solid silica created two thin slots gap cavity. A third multi-cavity structure fabricated...

Using a liquid phase epitaxy (LPE) technique (1 1 1) yttrium iron garnet (YIG) films with thicknesses of ≈100 nm and surface roughnesses as low 0.3 have been grown on gadolinium gallium (GGG) substrates basic material for spin-wave propagation experiments in microstructured waveguides. The continuously strained exhibit nearly perfect crystallinity without significant mosaicity effective lattice misfits below. film/substrate interface is extremely sharp broad interdiffusion layer formation....

Abstract Due to the ongoing improvement in nanostructuring technology, ultrathin metallic nanofilms have recently gained substantial attention plasmonics, e.g. as building blocks of metasurfaces. Typically, noble metals such silver or gold are materials choice, due their excellent optical properties, however they also possess some intrinsic disadvantages. Here, we introduce niobium (~10 nm thickness) an alternate plasmonic platform. We demonstrate functionality by depositing a nanofilm on...

New miniaturized sensors for biological and medical applications must be adapted to the measuring environments they should provide a high measurement resolution sense small changes. The Vernier effect is an effective way of magnifying sensitivity device, allowing higher sensing. We applied this concept development small-size optical fiber Fabry–Perot interferometer probe that presents more than 60-fold temperature normal without effect. This enables sensor reach resolutions. silica created...

A structured sapphire-derived all-glass optical fiber with an aluminum content in the core of up to 50 mol% was used for Bragg grating inscription. The provided a parabolic refractive index profile. Fiber gratings were inscribed by means femtosecond-laser pulses wavelength 400 nm combination two-beam phase mask interferometer. Heating experiments demonstrated stability temperatures 950°C more than 24 h without degradation reflectivity.

We discuss a fiber-integrated refractive index sensor with strongly improved detection performance. The resonator has been implemented by means of focused-ion beam milling step fiber and shows sensitivity about 1.15µm/RIU. Coating the walls led to mirror reflectivity factor 26. Design rules for device optimization detailed mathematical analysis are discussed, revealing that operates as an optimized Fabry-Perot resonator. also show performance such kind sensors is, in general, limited limit...

Silicon nanowire-based solar cells received increasing attention due to their enhanced light harvesting properties and the potential use low-cost materials produce comparable with those on costly monocrystalline counterparts. It is essential improve performance of nanowire by suppressing surface recombination. A multiple core (crystalline silicon nanowires)–shell heterojunction cell has been fabricated deal this problem. To end, an ultrathin passivating Al2O3 tunnel layer was deposited...

Focused ion beam technology is combined with chemical etching of specifically designed fibers to create Fabry-Perot interferometers. Hydrofluoric acid used etch special and microwires diameters 15 μm. These are then milled a focused two different structures: an indented structure cantilever that characterized in terms temperature. The also sensitive vibrations capable measuring frequencies the range 1 Hz - 40 kHz.

In this paper we report on an alternative technique for the preparation of ytterbium (Yb)-doped silica fibers and their characteristics compared to conventional modified chemical vapor deposition (MCVD) process in combination with solution doping powder sinter technology (REPUSIL). case applied here, active core diameter preform can be significantly increased via Yb most important codopant, aluminum (Al), gas phase through high-temperature evaporation chelate compound Al chloride MCVD...

Mesoporous silica particle-embedded graphene oxide (GO) is a promising platform for electrochemical biosensing. We report GO–SiO₂ composite electrode urea detection, with excellent reproducibility, specificity and stability.

We are reporting on S i O 2 ‐ A l 3 L a glasses—with and without Y b —suitable for nonlinear fiber laser applications. will also be presenting successful supercontinuum generation operation around 1060 nm in step‐index fibers. optimized the glass compositions terms of thermal optical requirements both high concentration good compatibility with silica cladding. produced bulk samples, unstructured fibers, structured fibers core cladding this purpose.

Abstract We have developed an efficient, low temperature, synthetic route for ZnO nanoflowers (NFs) as photoanode material. This alternative yields small flowerlike nanostructures, built from densely self-assembled tip-ended rod structures. The obtained NFs possess a large bandgap of 3.27 - 3.39 eV, enabling the generation average open current voltage 0.56 V. Additionally, they show high internal light harvesting 14.6•10 -7 A-mol -1 . growth mechanism and self-assembly were studied in detail...

Abstract We present electrochemical and chemical synthesis of platinum black at room temperature in aqueous non-aqueous media. X-ray analysis established the purity crystalline nature. The electron micrographs indicate that nanostructures consist crystals interconnect to form porous assemblies. Additionally, thin layer, which was electrochemically deposited on different metallic semiconductive substrates (aluminium, platinum, silver, gold, tin-cooper alloy, indium-tin-oxide, stainless steel,...

Staphylococcus aureus is one of the most frequent human pathogens that can also act as a facultative intracellular pathogen causing infections are extremely difficult to treat. Only little known about pathogen's adaptation strategies escape host's response. Here, we present an advanced Raman-based imaging approach providing high quality false-color images specifically identify S. and localize them exactly in three dimensions within endothelial cells. At same time unprecedented insights into...

Abstract In this contribution, inspired by the excellent resource management and material transport function of leaf veins, electrical metallized veins is mimicked from vein networks. By electroless copper plating on real networks with thickness only several hundred nanometre up to micrometre, certain can be converted transparent conductive electrodes an ultralow sheet resistance 100 times lower than that state-of-the-art indium tin oxide thin films, combined a broadband optical transmission...

Abstract A novel small signal equivalent circuit model is proposed in the inversion regime of metal/( ZnO , ZnMnO and ZnCoO ) semiconductor/ Si 3 N 4 insulator/p-Si semiconductor (MSIS) structures to describe distinctive nonlinear frequency dependent capacitance ( C-F conductance G-F behaviour range from 50 Hz 1 MHz. We modelled fully depleted thin films extract static dielectric constant ε r . The extracted enhancement magnetic n-type conducting ≥ 13.0) 25.8) comparison unmagnetic =...

Using magnetic nanoparticles (MNPs) for extracorporeal heating applications results in higher field strength and, therefore, particles of coercivity can be used, compared to intracorporeal applications. In this study, we report the synthesis and characterization barium hexa-ferrite (BaFe12O19) as potential heating. a precipitation method followed by high-temperature calcination, first studied influence varied parameters on particles’ properties. Second, iron-to-barium ratio (Fe/Ba = r) was...