Using a surface integral equation approach based on the tangential Poggio–Miller–Chang–Harrington–Wu–Tsai formulation, we present full wave analysis of resonant modes 3D plasmonic nanostructures. This method, combined with evaluation second-harmonic generation, is then used to obtain better understanding their nonlinear response. The generation associated fundamental dipolar three distinct nanostructures (gold nanosphere, nanorod, and coupled nanoparticles) computed in same formalism...

Multiresonant plasmonic nanoantennas have recently gained a lot of attention due to their ability enhance nonlinear optical processes at the nanoscale. The first nanostructure designed for this purpose was an aluminum antenna composed three arms, be resonant both fundamental and second harmonic frequencies. It demonstrated that generation induced by its resonances wavelengths is higher than one from simple dipolar nanoantenna supporting resonance wavelength only. However, underlying...

The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, of metals, such as gold, with transition elements, iron, have unique a number potential applications, ranging from nanomedicine to magneto-plasmonics plasmon-enhanced catalysis. Here, we investigate the localized surface plasmon resonance at level single Au-Fe nanoparticle by applying strategy that combines experimental measurements using near field electron energy loss...

While plasmonic antennas composed of building blocks made the same material have been thoroughly studied, recent investigations highlighted unique opportunities enabled by making compositionally asymmetric systems. So far, mainly heterostructures nanospheres and nanodiscs investigated, revealing for design Fano resonant nanostructures, directional scattering, sensing catalytic applications. In this article, an improved fabrication method is reported that enables precise tuning heterodimer...

We investigate the plasmonic behavior of Koch snowflake fractal geometries and their possible application as broadband optical antennas. Lithographically defined planar silver antennas were fabricated characterized with high spatial spectral resolution using electron energy loss spectroscopy. The experimental data are supported by numerical calculations carried out a surface integral equation method. Multiple plasmon edge modes structures have been imaged analyzed. Furthermore, isolating...

Second-harmonic generation in plasmonic nanostructures is known to enable the observation of modes with vanishing dipolar moments, i.e., having small radiation losses and thus long lifetimes. With aid a full wave numerical method, we study far-field temporal dynamics linear nonlinear responses silver nanorod driven by femtosecond pulses. The results show that plasmons lifetime observable decaying field oscillations surviving after exciting pulse, for both processes, fits damped harmonic...

Electron energy loss spectroscopy is a method of choice for the characterization both spatial and spectral properties localized surface plasmon resonances. The lost by impinging electrons commonly explained Lorentz force acting on their motion. Here, we adopt another point view to compute electron spectra. Coupling conservation law with full-wave electromagnetic computations based integral equation method, derive spectra directly from two dissipative processes, namely, absorption scattering....

In this work, we investigate the generation of second-harmonic light by gold nanorods and demonstrate that collected nonlinear intensity depends upon a phase interplay between different modes available in nanostructure. By recording backward forward emitted signals from with various lengths, find maximum signal directions is not obtained for same nanorod length. We confirm experimental results help full-wave computations done surface integral equation method. These observations are explained...

Resonant waveguide gratings (RWGs) are thin-film structures, where coupled modes interfere with the diffracted incoming wave and produce strong angular spectral filtering.The combination of two finite-length impedance matched RWGs allows creation a passive beam steering element, which is compatible up-scalable fabrication processes.Here, we propose design method to create large patterns such elements able filter, steer, focus light from one point source another.The based on ellipsoidal...

We numerically investigate the second harmonic generation from different plasmonic systems and evidence key role played in their nonlinear response by phase at fundamental wavelength. In case of a single nanorod, interference between dipolar quadrupolar emission modes depends on relative phase, which is deeply related to excitation The knowledge obtained this simple then used describe understand more complex structure, namely gold nanodolmen. evolution associated with Fano resonance arising...

The full wave surface integral equation computation of the second harmonic generation (SHG) dynamics for metal spheres and nanorods - presented as multimedia files is performed to reveal modes supported by nanostructure. We demonstrate that interplay between different controls nonlinear response size-induced redshift eigenmodes can be manipulated adjusting nanostructure geometry, so SHG signal boosted at specified frequencies. show radiation not necessarily quadrupolar in spherical...

A volume hologram recorded with a lens array is proposed as color transflective screen for Head Worn Display (HWD) systems. Design, fabrication well proof of concept are reported. Light from single MEMS-based projector efficiently diffracted towards the eye an angular spread given by numerical aperture lenses forming array. Using dual-focus contact lens, full high-resolution images added to HWD user's normal vision. system 55 degrees lateral field view demonstrated. This offers possibility...

Second-harmonic generation (SHG) is investigated from three kinds of lithographically fabricated plasmonic systems: Al monomers, Au monomers and Au-Al heterodimers with nanogaps 20 nm. Spectrally integrated SHG intensities the linear optical responses are recorded compared. The results show that for monomer nanoantennas, signal depends sensitively on excitation plasmon resonance by fundamental wavelength. For heterodimer apart resonant excitation, nonlinear factors such as SH driving fields...

We propose an extensive discussion on the homogenization and scattering analysis of second-order nonlinear metasurfaces. Our developments are based generalized sheet transition conditions (GSTCs) which used to model electromagnetic responses The GSTCs solved both in frequency domain, assuming undepleted pump regime, time-domain, dispersionless material properties but a possible depleted regime. Based these two modeling approaches, we derive general second-harmonic reflectionless...

The status of microscopic X-ray fluorescence analysis with tube excitation and synchrotron radiation is reviewed in terms the lateral resolution, minimum detection limits elemental sensitivity that can be achieved. As illustrations, utilization two typical state-of-the-art instruments for geological material described; one based on excitation, other installed at a source. analytical implications use microprobes third generation storage ring, particular European Synchrotron Radiation Facility...

Plasmonic antennas have enabled a wealth of applications that exploit tailored near-fields and radiative properties, further endowed by the bespoke interactions multiple resonant building blocks. Specifically, when interparticle distances are reduced to few nanometers, coupling may be greatly enhanced leading ultimate near-field intensities confinement along with large energy splitting modes. While this concept is well-known, fabrication characterization suitable multimers controlled...

Abstract Radioisotope‐excited XRF systems, using annular sources, are widely used in view of their simplicity, wide availability, relatively low price for the complete system and good overall performance with respect to accuracy detection limits. However, some problems arise when use fundamental‐parameter techniques quantitative analysis is attempted. These due fact that systems operate large solid angles incoming emerging radiation, both incident take‐off not trivial. In this paper, an...

The silencing of the second harmonic generation process from plasmonic nanostructures corresponds to limited far-field radiation despite huge fundamental electric field enhancement in interstice between two nanoparticles forming a nanodimer. In this article, we report comprehensive investigation effect using surface integral equation method. Various geometries are considered, including nanoantennas with cylindrical and rectangular arms as well nanodimers defects. existence nanogaps is first...