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...

This paper outlines a Tele-presence framework to facilitate teaching in future mixed reality spaces. In world where the increasing use of Massive Open Online Courses (MOOC) are beginning compete with traditional university education, due part rapid increase student fees across world, is there middle ground advantages MOOC's can be balanced spaces? space diverges from other Multi-User Virtual Learning Environments (MUVLE) by aiming create spaces which lecturer and students not only virtually...

We have investigated the responsible mechanism for observation of metallic conductivity at room temperature and metal-semiconductor transition (MST) lower temperatures aluminum-doped zinc oxide (AZO) films. AZO films were grown on glass substrates by radio-frequency magnetron sputtering with varying substrate (Ts). The found to be crystalline electrical resistivity close 1.1 × 10−3 Ω cm transmittance more than 85% in visible region. saturated optical band gap 3.76 eV was observed sample Ts...

Abstract We demonstrate that a nanostructured metal thin film can achieve enhanced transmission efficiency and sharp resonances use large-scale high-throughput nanofabrication technique for the plasmonic structures. The fabrication combines features of nanoimprint soft lithography to topographically construct films with nanoscale patterns. Metal nanogratings developed using this method show significantly optical (up one-order-of-magnitude enhancement) full width at half maximum (FWHM) ~15nm...

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...

Abstract Artificial and engineered nanostructures expand the degrees of freedom with which one can manipulate intricate interplay light matter. Certain nanostructural arrangements in excited state enable efficient electromagnetic coupling propagating localized fields. Here, we demonstrate that transmitted through a nanostructured metal thin film without any apertures be significantly enhanced. Distinct asymmetric Fano resonances are observed zero-order transmission spectra using an...

Al-doped ZnO films were deposited by the atomic layer deposition (ALD) on both glass and sapphire (0001) substrates. The Al composition of was varied controlling Zn:Al pulse cycle ratios. characterized force microscopy, x-ray photoelectron spectroscopy, diffraction, optical measurements. Film resistivity measured as a function ratios well temperature for grown at various substrate used ALD deposition. decreases significantly, so increase in carrier concentration ratio increases. systematic...

We have demonstrated the nanopatterning of atomic layer deposited (ALD) Al:ZnO (AZO) films using electron beam lithography (EBL) for plasmonic waveguide applications. The influence grains on repeatable planar nanostructures by nanolithography process was studied annealed in order to avoid effects granularity. Our results demonstrate that AZO EBL technique is limited due granularity ALD grown films. This finding suggests limitations samples optical applications where nanopatterns are...

Mercury Cadmium Telluride (MCT) is the premier active material used in infrared (IR) detection technology. The most recent work related to improvement of MCT-based detectors associated with reducing s/n ratio, and increasing operating temperature without compromising performance. However, little has been done manipulating Electric field intensity near absorber region device. Our numerical studies show that absorption profile MCT mid-infrared can be enhanced by integrating metal oxide...

Utilizing ultraviolet photochemical reduction of gold(III) chloride trihydrate (HAuCl4), a new kind synthesis highly dense gold nanoparticle film on p-type silicon wafer was conducted. Through scanning electron microscopy and atomic force microscopy, the confirmed to be 90 nm thick, with an average size 125 in diameter. To explore applications surface enhanced Raman spectroscopy (SERS), protein model streptavidin pegylated biotin functionalized films employed. Observations indicate that...

We fabricated one-dimensional periodic multilayered metamaterial structures consisting of Ag and SiO₂alternating layers. Optical responses, such as transmission absorption, are consistent well within finite difference time domain (FDTD) simulations. Angle dependent real imaginary dielectric permittivity reflection spectra demonstrate their operational capability in the visible wavelength region. This multilayer can be converted into a photonic crystal by manipulating thickness SiO₂ we that...

The tunability of optical properties in inorganic semiconductor quantum dots (QDs) allows them to be exceptional candidates for multiple and optoelectronic applications. While QD size dictates these properties, the addition highly luminescent rare-earth elements also affects absorption emission properties. In this work, we were able successfully synthesize europium-doped CdSe QDs using a one-pot microwave synthesis method. Using recipes that previously developed, Eu3+:CdSe tune their by...

Optical tweezer is a non-contact tool to trap and manipulate microparticles such as biological cells using coherent light beams. In this study, we utilized dual-beam optical tweezer, created two counterpropagating slightly divergent laser beams deform cells. Human embryonic kidney 293 (HEK-293) breast cancer (SKBR3) were used characterize their membrane elasticity by optically stretching in the tweezer. It was observed that extent of deformation both cell types increases with increasing...

Silicon photonics enables the fabrication of optical devices with standard semiconductor processing technology. With high transparency and modal confinement, Si has matured into a well-established infrared material. Nanostructured silicon been studied extensively due to its properties, especially nanowires myriad available techniques, broad range physical dimensions, resulting characteristics. In this study, we fabricate using wet chemical process modify their absorptive properties via...

Hyperbolic metamaterials create artificial anisotropy using metallic wires suspended in dielectric media or alternating layers of a metal and (Type I Type II). In this study we fabricated ZnO/Al:ZnO (AZO) multilayers by the RF magnetron sputtering deposition technique. Our satisfy requirements for type II hyperbolic metamaterial. The optical response individual AZO ZnO films, as well multilayered film were investigated via UV-vis-IR transmittance spectroscopic ellipsometry. system is...

Mercury Cadmium Telluride (MCT) is a primary absorber material used in most infrared (IR) detection technologies. Our previous studies show that the optical absorbance profile of MCT mid-infrared region can be enhanced by 13% under ambient conditions via integrating periodic Indium Tin Oxide (ITO) nanostructures. Here, we focus on geometrical parameterization and optimization ITO nanostructure arrays. We simulate several types geometries, their corresponding effective absorption profiles,...

We demonstrate that the controlled self-assembly of DNA nanostructures can happen on electron beam lithographically patterned surfaces at lower energy. The fluorescent dye coupled amine modified were selectively attached to glass substrates. optimized binding interaction between self-assembled occurred preferably energy due attractive pattern and DNAs. Patterns containing molecules with dimensions as small 2 nm in height 68 width have been successfully demonstrated. periodicity was observed....

We have demonstrated the attachment of aligned ZnO nanorod arrays on to electron beam lithographically patterned oxide surface at lower energy. At higher energy (~ 20 KeV), accumulated negative charges that already built in due course irradiation restricts growth arrays. This causes a shielding potential close micron level, and completely unfavorable for carriers. However, comparatively 5 KeV or less), secondary electrons are responsible pattern with zone centered by local positive field....

: The presence of denatured proteins within a therapeutic drug product can create series serious adverse effects, such as mild irritation, immunogenicity, anaphylaxis, or instant death to patient. detection protein degradation is complicated and expensive due current methods associated with instrumentation, reagents, processing time. We have demonstrated here platform for visual biosensing that fast, low cost, sensitive, user friendly by exploiting the plasmonic properties noble metal...

In the past two decades there has been a developing interest in using surface plasmon resonance materials for biosensors, environmental sensors, and medical devices due to their ability identify lower concentrations of analytes. Surfaced Enhanced Raman Spectroscopy useful technique understand plasmonic behavior materials. This research team developed novel method fabricating highly densely packed film green synthesized gold nanoparticles UV irradiation with light source at 254nm 185 nm....