We report polarization dependent photoluminescence studies on unintentionally-, Mg-, and Ca-doped β-Ga2O3 bulk crystals grown by the Czochralski method. In particular, we observe a wavelength shift of highest-energy UV emission which is pump photon energy polarization. For 240 nm (5.17 eV) excitation almost no observed between E||b E||c, while centroid clearly for 266 (4.66 eV), lying band absorption onsets two polarizations. These results are consistent with originating from transitions...

We report modification of the ultraviolet (UV) fluorescence decay rate p-terphenyl dye molecules by magnesium (Mg) nanoapertures in free solution, comparison with aluminum (Al). Mg exhibit a lifetime reduction up to ∼7.2×, which our knowledge is largest UV reported so far literature. In comparison, Al ∼5.3×, exceeding previously value ∼3.5× due smaller aperture size employed here. Simulation results reveal large plasmon resonance frequency shifts between and nanoapertures, contributing...

Aluminum and magnesium have a strong plasmonic response in the ultraviolet part of spectrum. Due to differences their dielectric responses, however, there are qualitative fluorescence enhancement factors for Al Mg nanoapertures. In order make our results applicable experimental studies, we further investigate these nanoapertures using UV emitters that excite near 270 nm emit 340 with both high low quantum yields (QY). Our suggest may perform better molecules QY, while QY. We consider effects...

This work provides a new pathway for scalable, low-cost, and high-precision bio-sensing technology.

The widely used QUICKEST method with ULTIMATE flux limiter is not capable of solving the charge transport problems a very steep wavefront accurately, due to wide stencil adopted. Furthermore, splitting process separating convection and reaction terms in introduces additional errors. To solve such novel numerical based on Runge–Kutta discontinuous Galerkin (RKDG) introduced this paper, which has high-order resolution weak correlation between cells. bipolar under dc voltage solid dielectrics...

We scrutinize experimentally and theoretically the electrokinetics of a nanochannel network in nanoparticle crystal. Conductance network, function concentrations loaded electrolyte solutions, exhibits typical electrokinetic properties individual but with much larger electrical signal. A widely accepted equation is used to elucidate origin high throughput from top-down perspective. Using bottom-up analysis, stepwise modeling process highly ordered proposed render an in-depth view nanofluidics network.

Herein, wafer‐scale Ga 2 O 3 films are shown, which synthesized by oxide printing of liquid metal on SiO /Si and sapphire substrates. This process enables highly uniform ≈2 nm‐thick over ≫1 mm areas. The physical properties these (as‐deposited after annealing in ambient conditions) investigated. X‐ray photoelectron spectroscopy indicates that the as‐prepared contain significant fractions (up to 8% wt) residue, completely converts annealing. Results from Raman confirm presence β‐phase...

We report a new type of structural defect in β-Ga2O3 homoepitaxial thin films grown by metalorganic vapor phase epitaxy, which we have dubbed as “sympetalous defects.” These consist line (for example, nanotube defect) the underlying substrate combined with multi-faceted inverted polycrystalline pyramid epitaxial film, may also be decorated twinned grains. In plan-view atomic force, scanning electron, or optical microscopies, sympetalous defects appear similar shape to polygonal etch pits...

Abstract Optoelectronic devices in the UV range have many applications including deep-UV communications, photodetectors, spectroscopy, etc. Graphene has unique exciton resonances, that demonstrated large photosensitivity across spectrum. Enhancing absorption graphene potential to boost performance of various opto-electronic devices. Here we report numerical study on aluminum and magnesium hole-arrays. The a single-layer hole-arrays reached maximum value 28% 30% respectively, peak is tunable...

We propose an analytical theory which predicts that Converging Plasmon Resonance (CPR) at conical nanotips exhibits a red-shifted and continuous band of resonant frequencies suggests potential application in various fields, such as plasmonic solar cells, photothermal therapy, tip-enhanced Raman other spectroscopies. The CPR modes exhibit superior confinement ten times broader scattering bandwidth over the entire spectrum than smooth nano-structures. also explicitly connects optimal angles...

In this paper, a novel high-order accurate numerical method was proposed to simulate the space charge transport in solid dielectrics. It is based on unified framework, discontinuous Galerkin (DG) method, solve both concentration and electric field. easier implement more efficient than combined DG boundary element (BEM) with equivalent accuracy. With new symmetric model parameters for low-density polyethylene (LDPE), field distribution under different external injection barrier heights were...

The study of plasmonic nanostructures in the ultraviolet (UV) is a relatively uncharted field because challenges both engineering and materials science. In this work, two-dimensional periodic nanohole arrays aluminium (Al) magnesium (Mg) films were fabricated using gallium (Ga) focused ion beam. Optical transmission through was obtained UV–visible range for varying array periodicity. Transmission results show strong resonance enhancement suppression with corresponding red shift as period...

This paper reports an enhanced approach of thermal reduction phosphogypsum (PG) in the presence sodium chloride (NaCl) its molten phase. The thermodynamic together with in-situ thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR) result indicates yield CaS (solid) at investigated temperature range (800-850 °C). Addition NaCl not only appreciably reduces activation energy this reaction °C) on average from 315 to 175 (kJ·mol-1) materially, but also significantly improve...

Research focused on improving the sensitivity of SPR analytical technology has led to investigation different electric field enhancement elements for incorporation with classic sensor structures. Over past ten years, considerable attention been given ceramic, metal oxide, and 2D materials that not only improve magnitude but are also used as affinity layers improved adsorption molecules. However, focusing improvements these deliver can lead designers explore some themultiple dependencies...

Nanofluidic devices are of great interest due to their promising applications in biological/chemical detection and miniaturized power supplies. A rhombus-shaped channel with nanometer-sized opening is particular as it can induce versatile symmetry-breaking phenomena such current gating rectification, hysteresis, biomolecule stretching etc. However, existing nanofabrication techniques, electron beam lithography, usually costly time-consuming the target pattern has a spectrum characteristic...

Herein we utilize polarized photoluminescence (PL) microscopy and spectral analysis to locate characterize many different types of µm-scale extended defects present in melt-grown bulk crystals metal-organic vapor-phase epitaxy (MOVPE)-grown epitaxial thin films β-Ga 2 O 3 β-(Al,Ga) . These include pits, divots, mounds, scratches, rotation domain boundaries, stacking faults, cracks, other defect categories. Some simply decrease overall PL yield, while others emit spectra than single crystal...

Thermal barrier coatings (TBCs) is one of the main key technology for high-pressure turbine blades which are components high-performance aerospace engines. It offers protection underline metallic from corrosion, oxidation and localized melting by insulating metal hot gases in engine core. The properties lifetime TBCs greatly influenced preparation technology, includes plasma spraying (PS), physical vapor deposition (PVD) laser re-melting (LM). In this paper, three technologies used to...

Most of the fiber optic-based surface plasmon resonance (SPR) sensors use gold or silver metal as part sensing region. It is known from literature that presents a better performance in terms sensitivity, although less stable and strongly affected by oxidation, which turns reduces its lifetime. To overcome this effect, other materials, such gold, are proposed alternatives combined with silver, forming bimetallic layers, leading to higher sensor performance. Furthermore, adding graphene layers...

We describe a new material system based on alloys of gallium and platinum that is well-suited for ultraviolet (UV) plasmonics. Although has previously been shown to be useful such studies, creating continuous, pinhole-free thin film technically challenging. For example, when vacuum deposition techniques are used, forms as isolated spherical nanoparticles wide variety substrates. demonstrate wetting layer deposited first substrate followed by thick layer, Ga-Pt alloy formed near the...

Abstract The native fluorescence of biomolecules has been used in analytical chemistry to determine the concentration an analyte. However, detecting based on their intrinsic at low is challenging due small quantum yield and poor photon stability. Ultraviolet plasmonics have reported increase stability such as DNA, peptides, proteins. experimentally count rate, or net enhancement factor, small-with <?CDATA $\lt$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...

Abstract While terahertz spectroscopy can provide valuable information regarding the charge transport properties in semiconductors, its application for characterization of low-conductive two-dimensional layers, i.e., σ s &lt; 1 mS, remains elusive. This is primarily due to low sensitivity direct transmission measurements such small sheet conductivity levels. In this work, we discuss harnessing extraordinary optical through gratings consisting metallic stripes characterize layers. We analyze...