We report the suppression of loss surface plasmon polariton propagating at interface between silver film and optically pumped polymer with dye. The large magnitude effect enables a variety applications 'active' nanoplasmonics. experimental study is accompanied by analytical description phenomenon. In particular, we resolve controversy regarding direction wavevector wave strong evanescent component in an active medium.

We have observed the compensation of loss in a metal by gain dielectric medium mixture an Ag aggregate and Rhodamine 6G dye. The demonstrated sixfold enhancement Rayleigh scattering is evidence surface-plasmon resonance. reported experimental observation facilitates many applications nanoplasmonics.

We show that despite of low loss, silver and gold are not suitable for a variety nanoplasmonic applications in the infrared range, which require compact modes single-interface plasmonic waveguides. At same time, degenerate wide-band-gap semiconductors can serve as high-quality materials at telecom wavelengths, combining fairly high compactness relatively loss. Their properties near-infrared be compared to those visible range. The used non-plasmonic metamaterials applications, including...

Plasmonic materials (PMs), featuring large static or dynamic tunability, have significant impact on the optical properties due to their potential for applications in transformation optics, telecommunications, energy and biomedical areas. Among PMs, carrier concentration mobility are two tunable parameters, which control plasma frequency of a metal. Here, we report tunability wavelengths up 640 nm Al-doped ZnO based transparent conducting degenerate semiconductors by controlling both...

An atomic frequency standard based on a fountain of cold cesium atoms has been in operation our laboratory for few months. Ramsey fringes as narrow 0.7 Hz have obtained. The short-term stability, measured against an H-maser, is 3 10/sup -13/ /spl tau//sup -1/2/, probably limited by the local oscillator noise. A preliminary evaluation some systematic effects shows that collisions will be limiting effect long-term stability and accuracy. Measurements this shift presented here, using...

We have studied stimulated emission in a random laser based on rhodamine 6G dye and TiO2 nanoparticles. At both small large concentrations of nanoparticles, the minimum threshold was found at ultra-high dye, 20 g L−1. With increase concentration reaches its maximum transition from weak-scattering regime to strong-scattering regime, when transport mean free path lt is approximately equal absorption length la. same value lt, qualitatively changes behavior. The experimental results are good...

We have demonstrated a simple approach for developing photovoltaic device consisting of semiconductor-insulator-semiconductor (SIS) heterojunction using surface plasmon polaritons (SPPs) generated in one the semiconductors (Al:ZnO) and propagated through dielectric barrier (SiO2) to other (Si). This robust architecture based on excitation within an SIS that produces power spatial confinement electron absorption Al:ZnO broad spectrum visible infrared wavelengths enhancing activities. finding...

Abstract Large area highly crystalline MoS 2 and WS thin films were successfully grown on different substrates using radio-frequency magnetron sputtering technique. Structural, morphological thermoelectric transport properties of 2, have been investigated systematically to fabricate high-efficient thermal energy harvesting devices. X-ray diffraction data revealed that crystallites are oriented in 002 plane with uniform grain size distribution confirmed through atomic force microscopy study....

This study examined mental health disparities among African Americans using AI and machine learning for outcome prediction. Analyzing data from American adults (18–85) in Southeastern Virginia (2016–2020), we found Mood Affective Disorders were most prevalent (41.66%), followed by Schizophrenia Spectrum Other Psychotic Disorders. Females predominantly experienced mood disorders, with patient ages typically ranging late thirties to mid-forties. Medicare coverage was notably high schizophrenia...

Abstract We grew lead-free BaZr 0.2 Ti 0.8 O 3 (BZT)/Ba 0.7 Ca 0.3 TiO (BCT) epitaxial heterostructures and studied their structural, dielectric, ferroelectric energy density characteristics. The BZT/BCT were grown on SrRuO (SRO) buffered SrTiO (STO) single crystal substrate by optimized pulsed laser deposition (PLD) technique. These high-quality nanostructures exhibit high dielectric permittivity (∼1300), slim electric field-dependent polarization (P-E) curve with saturation (∼100 µC/cm 2 )...

The addition of suitable metallic dopants into the indium or zinc oxide matrix is essential to obtain transparent conducting (TCO) thin films for high-performance optoelectronics devices. However, scarcity one major challenges common use doped tin (ITO) as a TCO material future state-of-the-art To overcome challenge, used an alternative traditional ITO and retains both high transparency electrical conductivity. One such potential gallium-doped (GZO). GZO were deposited onto glass well Kapton...

Abstract One of the ways to mitigate world energy crisis is harvest clean and green from waste-heat, which abundant, ubiquitous, free. Energy harvesting this waste-heat one most encouraging methods capture freely accessible electrical energy. Ferroelectric materials can be used for low power electronic devices, as they exhibit switchable polarization, excellent piezoelectric pyroelectric properties. The important characteristic ferroelectric materials, in context harvesting, their ability...

We demonstrate two-threshold random laser emission in the mixtures of GaAs powder with Al2O3 powder. The dilution helps to maximize output efficiency stimulated emission.

We have demonstrated that by adding the solution of aggregated silver nanoparticles to rhodamine $6\mathrm{G}\phantom{\rule{0.3em}{0ex}}\mathrm{dye}$, one can enhance efficiency spontaneous and stimulated emission. attribute an increase emission intensity dye absorption caused field enhancements in metallic nanostructures associated with surface plasmons. The enhancement dye, which has same nature as absorption, was observed pump-probe laser experiments.

Highly sensitive large-scale tin oxide (SnO2) nanostructures were grown on a glass substrate by thermal evaporation of mixture anhydrous (II) chloride (SnCl2) and zinc (ZnCl2) powders at 550°C in air. We demonstrate single cell vapor deposition system to precisely control nanostructural morphology SnO2 changing the weight ratio SnCl2 ZnCl2 growth temperature. The structural property as-grown characterized using scanning electron microscopy (SEM) X-ray diffraction (XRD). SEM images revealed...

Quantum dots (QDs) are a hot topic in optoelectronic device research, due to tailorable absorption and emission properties. Unfortunately, the conventional methods of QD synthesis hazardous time-consuming. In this work, we present an alternative method fabricating cadmium selenide (CdSe) QDs (via rapid microwave synthesis). This novel fabrication provides quick efficient way synthesize that almost identical those commercially available. We also demonstrate tuning sizes by varying time...

The La(1-x)Sr(x)MnO3 (LSMO) nanoparticles have been synthesized by citric gel process followed ball milling method. These demonstrated high crystalline quality. Nanoparticle size was further decreased technique as observed the field-emission scanning electron microscopic studies. milled and silica coated LSMO show magnetic transition at about 370 K with a superparamagnetic properties. ferromagnetic resonance (FMR) spectra analysis of shows large FMR linewidth due to surface strain...

Using the coherent backscattering technique, we have measured transport mean-free-path lengths lt for photons in NdAl3(BO3)4 powder, a promising solid-state random laser material. The developed model allows one to calculate as function of mean particle size s tightly packed powder or sintered ceramic. experimentally determined value is good agreement with prediction.

Abstract The metal-to-insulator transition (MIT) closest to room temperature of 68–70 °C as shown by vanadium oxide (VO 2 ), compared with other metal oxides, makes it a potential candidate for smart window coating. We have successfully fabricated device after the optimum design multilayered thin film structure made out transparent conducting (aluminum doped zinc oxide) and pure VO using pulsed laser deposition technique. This comprehensive study is based on two different configurations...

Recent advancements in computing technologies coupled with the need to make sense of large amounts raw data have renewed much interest data-driven materials design and discovery. Traditional science research relies heavily on experimental gauge properties materials. However, this paradigm is purely based trial error ongoing can take decades discover new Data-driven modeling tools such as machine learning its proven libraries help speed up materials’ discovery process through implementation...