The optical absorption efficiency of nanospheres and nanoshells the elements Na, K, Al, Ag, Au are compared, effects surface scattering, as introduced by billiard model [Moroz, A. J. Phys. Chem. C 2008, 112 (29), 10641−10652] discussed. We find that introduction scattering has comparatively little effect on optimized nanospheres, with maximum K falling from 14.7 to 13.3. Conversely, reduction in is substantial. This compounded metals higher plasma frequency. show high comparative frequencies...

Using first principles calculations we investigate the binding and diffusion of Li on silicene evaluate prospects for application to Li-ion batteries. We find that defect formation energy is half graphene, showing more likely contain defects. The overall lithium adsorption with defects greater than bulk cohesive giving stability use in storage. Our results predict high mobility atoms surface barriers range 0.28-0.30 eV. Further, barrier through significantly lower a value 0.05 eV double...

Self-assembled networks of nanoparticles and nanowires have recently emerged as promising systems for brain-like computation. Here, we focus on percolating which exhibit dynamics. We use a combination experiments simulations to show that the network dynamics emerge from atomic-scale switching inside tunnel gaps are distributed throughout network. The emulate leaky integrate fire (LIF) mechanisms in biological neurons, leading generation critical avalanches signals. These quantitatively same...

The optical properties of an ordered array gold nanospheres have been calculated using the T-matrix method in regime where near-fields particles are strongly coupled. consists a one-dimensional chain spheres 15 nm diameter number and interparticle spacing is varied. Calculations performed with chains up to 150 length between 0.5 30 nm. Incident light polarized along axis (longitudinal) perpendicular (transverse) it considered, latter case for wavevectors axis. For fixed longitudinal plasmon...

Optical metrics relating to metallic absorption in representative plasmonic systems are surveyed, with a view developing heuristics for optimizing performance over range of applications. We use the real part permittivity as independent variable; consider strengths particle resonances, resolving power planar lenses, and guiding lengths waveguides; compare nearly-free-electron metals including Al, Cu, Ag, Au, Li, Na, K. Whilst imaginary metal has strong damping effect, field distribution is...

We use electronic structure calculations based upon density functional theory to search for ideal plasmonic materials among the alkali–noble intermetallics. Importantly, we perturbation calculate electron–phonon interaction and from there a first order solution Boltzmann equation estimate phenomenological damping frequency in Drude dielectric function. discuss necessary features of material investigate optical properties intermetallics terms some generic system quality factors. conclude that...

A rich variety of dipolar and higher order plasmon resonances have been predicted for nanoscale cubes parallopipeds silver, in contrast to the simple modes found on silver nanospheres or nanorods. However, general, these multimode are not readily detected experimental colloidal ensembles, due primarily usual variation size shape particles obscuring blending individual extinction peaks. Recently, methods prepare with unprecedented control by nucleating onto a tightly controlled suspension...

Biological neuronal networks are the computing engines of mammalian brain. These exhibit structural characteristics such as hierarchical architectures, small-world attributes, and scale-free topologies, providing basis for emergence rich temporal dynamics long-range correlations. Devices that have both topological features a network would be significant step toward constructing neuromorphic system can emulate computational ability energy efficiency human Here we use numerical simulations to...

Abstract Tungsten oxides (WO x ) possess unique properties due to a synergy of multiple effects arising from their wide range stoichiometric and sub‐stoichiometric compositions, defect chemistry, polymorphism. Synthesis incorporation 1D WO nano‐assemblies is an attractive pathway enable highly efficient next‐generation photocatalysts, sensors, optoelectronic devices offering tunability over electro‐optical response in the spectrum, UV–vis NIR. However, synthesis metal oxide nano‐patterns...

First principles calculations have been used to predict the optical properties for a range of intermetallic compounds which little or no experimental data are currently available. Density functional theory combined with random phase approximation is calculate dielectric functions these compounds. The aim this work investigate how band edge and plasma frequency vary composition in order identify materials promising plasmonic properties. Towards end chosen composed elements on their own...

Abstract Design and production of spectrally smart windows, walls, roofs fabrics has a long history, which includes early examples applied nanophotonics. Evolving nanoscience special role to play as it provides the means improve functionality these everyday materials. Improvement in quality human experience any location at time year is goal. Energy savings, thermal visual comfort indoors outdoors, experience, air better health are all made possible by materials, whose “smartness” aimed...

Reservoir computing (RC) has attracted significant interest as a framework for the implementation of novel neuromorphic architectures. Previously attention been focussed on software-based reservoirs, where it demonstrated that reservoir topology plays role in task performance, and functional advantage attributed to small-world scale-free connectivity. However hardware systems, such electronic memristor networks, mechanisms responsible dynamics are very different is largely unknown. Here we...

A parallel study of natural and nanoengineered structurally chiral reflecting coatings is described. It shown that the nanostructures are different in a minor way but optically equivalent. Refractive index matching on plane substrate to improve saturation structural color. Optical electron microscopies reveal complexity multilayered produce green metallic-like reflections from manuka (scarab) beetles. In particular, reflectors have form small concave pits troughs filled with contouring...

Reflection can significantly improve the quality of subwavelength near-field images, which is explained by appropriate interference between forward and reflected waves. Plasmonic slabs may form approximate super-mirrors. This paper develops general theory in both spectral spatial representations that allows reflector position permittivity to be determined for optimum image uniformity. elucidates previous observations predicts behaviour some other interesting regimes, including...

A pair of coupled gold nanorods excited by a beam free electrons acts as transmitting Hertzian antenna in the optical part spectrum. Significantly enhanced resonant emission is observed from when electron injected around junction between rods, where local density electromagnetic states elevated.

There is currently a great deal of interest in the use nanoscale devices to emulate behaviors neurons and synapses facilitate brain-inspired computation. Here, it shown that percolating networks nanoparticles exhibit stochastic spiking behavior strikingly similar observed biological neurons. The rate can be controlled by input stimulus, "rate coding" biology, distributions times between events are log-normal, providing insights into atomic-scale mechanism. stochasticity then used for true...

In response to increasing interest in the area of subdiffraction-limited near-field imaging, performance several different realizable and theoretical superresolving silver-based lenses is simulated for a variety input object profiles. A computationally-efficient T-matrix technique used model lenses, which consist layers silver with total width 40 nm sandwiched between polymethyl methacrylate silicon dioxide. The are exposed nonperiodic bright- dark-slit patterns, feature size varied 1 2.5...

Equiatomic (Au,Cu) solid solution orders below 658 K to form a tetragonal AuCu (I) phase with significant changes in physical properties and the crystal structure. The effect of ordering on dielectric function material is controversial however, inconsistent results reported literature. Since nature any localized surface plasmon resonance (LSPR) nanostructures very sensitive function, this uncertainty hinders use plasmonic devices or structures. Therefore, we re-examine question using...

Dark-mode plasmon resonances can be excited by positioning a suitable nano-antenna above nanostructure to couple planar incident wave-front into virtual point source. We explore this phenomenon using prototypical consisting of silver nanotriangle which hole has been drilled and rod-like variable aspect ratio. Using numerical simulations, we establish the behavior basic under plane wave illumination electron beam irradiation provide baseline, then add investigate stimulation additional...