The authors analyze electromagnetic modes in multilayered nanocomposites and demonstrate that the response of a majority realistic layered structures is strongly affected by nonlocal effects originating from strong field oscillations across system, not described conventional effective-medium theories. They develop analytical description relevant phenomena confirm their results with numerical solutions Maxwell equations. Finally, use developed formalism to plasmonic nanostructures support...

We show that a stack of metal-dielectric nanolayers, in addition to the long- and short-range plasmon polaritons, guides also an entire family modes strongly confined within multilayer---the bulk polariton modes. propose classification scheme reflects specific properties these report experimental verification by measuring modal indices structure made three pairs silica $(\ensuremath{\sim}29\phantom{\rule{0.3em}{0ex}}\mathrm{nm})∕\text{gold}$...

Abstract The paper is concerned with the influence of finite size an incident beam upon both anomalous-reflection spectrum and shape energy distribution in a reflected beam. It proved experimentally that use corrugated waveguides as laser-resonator selective mirror improves spatial coherence radiation.

We study guided modes in a conductor-gap-dielectric (CGD) system that includes low-index dielectric gap layer of deep sub-wavelength thickness sandwiched between conductor and high-index cladding. Analysis the dispersion equation for CGD provides an analytical estimation cut-off layer. This mode is unusual because it exists when less than cutoff thickness. In direction normal to interfaces, modal electric field tightly confined within gap. Sub-wavelength lateral confinement readily provided...

We employed the atomic layer deposition technique to grow Al(2)O(3) films with nominal thicknesses of 400, 300, and 200 nm on silicon soda lime glass substrates. The optical properties were investigated by measuring reflection spectra in 400-1800 wavelength range, followed numerical fitting assuming Sellmeier formula for refractive index Al(2)O(3). grown substrates possess higher indices as compared silicon. Optical waveguiding is demonstrated, confirming feasibility high-index contrast...

Surface plasmons at the interface between metal and a dielectric with strong optical amplification are analyzed theoretically. It is shown that proper choice of indices medium results in an infinitely large effective refractive index surface waves. Such resonant have extremely low group velocity localized within vanishingly small distance near interface. The plasmon-related anomalies UV reflection spectra predicted for nanoscale gratings on silver film covered by concentrated dye solution...

We present experimental results and a numerical model confirming that surface plasmons can resonantly enhance light transmission through corrugated metal film. A new interpretation in terms of plasmon-assisted tunneling is given to recent experiments on penetration periodic subwavelength holes thin designed narrow-band filter suitable for applications optical communication by optimizing the film grating parameters.

We have found conditions for the reproducible, direct laser fabrication of sharp conical tips with heights about 1 μm and apical radii curvature several tens nanometers. An individual cone is formed when single-crystalline silicon on a silica substrate irradiated single pulse from KrF excimer laser, homogenized shaped to circular spot microns in diameter. Atomic force microscopy field-emission scanning electron were used characterize these structures. A simple mechanism formation based...

We describe the concept of a super compact diffractive imaging spectrometer, with optical components few millimeters across in all dimensions, capable detecting fluorescence spectra within entire visible spectral range from 400 nm to 700 resolution order 2 nm. In addition, proposed spectrometer is working simultaneously multiple, up 35, independent input channels. A specially designed element integrated planar waveguide key component device. preliminary experimental tests, uniform grating...

A miniature optical spectrometer with a thin-film planar waveguide grating coupler in combination plano-convex focusing lens has been investigated. With part of the as small 0.2 cubic cm, spectral resolution varies from 0.3 nm to 4.6 within wavelength range 488.0 - 632.8 nm.

We present analytical and computer modeling along with an experiment on the formation of sharp conical tips monocrystalline silicon thin films, silicon-on-insulator, subjected to irradiation by single 25 ns pulses from a KrF excimer laser focused into spot several micrometers in diameter. These fabricated structures have heights about 1 μm apical radii curvature tens nanometers. offer simplified model for these structures. The simulation includes two-dimensional time-dependant heat transfer...

Abstract Waveguide structures with two corrugated interfaces are considered. It is shown theoretically and experimentally that these can form the basis for a highly-efficient unidirectional grating coupler slab waveguides. The anomalous light reflection from waveguides boundaries also possibility of using frequency stabilization semiconductor laser demonstrated.

We present computer modeling along with experimental data on the formation of sharp conical tips silicon-based three-layer structures that consist a single-crystal Si layer 1 μm silica bulk substrate. The upper layers thicknesses in range 0.8−4.1 were irradiated by single pulses from KrF excimer laser focused onto spot several micrometers diameter. simulation includes two-dimensional time-dependent heat transfer and phase transformations films result irradiation (the Stefan problem). After...

We show that a generalized asymmetric resonant line shape derived elsewhere from rigorous electromagnetic calculations [Gallinet and Martin, Phys. Rev. B 83, 235427 (2011)] the two-oscillators model [Joe et al., Scr. 74, 259 (2006)] can also be obtained using very general assumption spectral dependence of scattering amplitudes is given by transfer function linear system. reformulate equation in case first-order all possible shapes presented weighted sum original Fano Lorentzian shapes....

This paper presents an integrated microcavity optical fiber pressure sensor using exfoliated ultrathin graphene atomic layers as a reflective surface to form Fabry-Perot (F-P) interferometric structure. The fabrication was based on the focused-ion-beam (FIB) micromachining and dry transfer method, where fabricated directly facet of standard SMF-28 single-mode with core diameter 8 μm cladding 125 μm. air leakage from cavity negligibly small during 30-min measurement time. responsivity...

We have fabricated and tested a waveguide grating mirror that uses anomalous reflection of light associated with excitation modes. Sharp features are observed in the spectra both wavelength angular domains. confirm experimentally that, when is placed short distance front large-area semiconductor laser, it can control emission spectrum. This demonstration opens new approach to design very compact lasers operating single-frequency–single-mode regime.

We propose a new concept of binary superimposed gratings (BSG's) as multiwavelength grating reflectors and show it an effective structural improvement over the existing designs, to both fabrication process device performance. also present study key design issues for widely tunable lasers based on mirrors with comb-like reflection spectrum summarize simple rules part laser, analytical numerical analysis. The supergrating consists elements equal size whose refractive index is allowed be one...

High-efficiency single-order grating coupling between an optical waveguided mode and a volume wave is achieved by means of double-sided corrugated cover film that has phase-shifted undulations. A greater than 90% outcoupling ratio into air demonstrated for weakly guiding ion-exchanged waveguides. The conditions efficient the tolerances on them are established.

We have investigated the effects of UV irradiation on electrical and optical properties polycrystalline In2O3 films. found that illumination at a peak wavelength 365 nm leads to sharp drop in resistance increase carrier concentration. This highly conductive state persists for timescale hours air room temperature after illumination. observe distinct changes absorption spectra associated change concentration, which is consistent with Burstein–Moss shift ∼0.1 eV. The relaxation rate this...

Using analysis and numerical simulation, we have investigated near-infrared mid-infrared second-harmonic generation (SHG) sum frequency (SFG) in crystal silicon (SOI) waveguides that possess a strong second-order nonlinear susceptibility by virtue of Si(3)N(4) straining layer applied directly to the top surface waveguide. This induces anisotropic compressive strain waveguide core. technique TE/TM mode birefringence, derived geometries for both slab strip channel offer perfect phase matching...

Resonant coupling to a gap plasmon-polariton supported by metal-dielectric nanoscale multilayer on top of silicon guiding core is proposed for polarization control in silicon-on-insulator waveguides. The device functionality relies the unusual dispersion properties plasmon-polaritons, whose modal index can be significantly higher than refractive layer.

Rodent models are increasingly used to study refractive eye development and of errors; however, there is still some uncertainty regarding the accuracy optical rat mouse primarily due high variability in reported ocular parameters. In this work, we have systematically evaluated contribution various parameters, such as radii curvature surfaces, thicknesses components, indices media, using variational analysis a computational model rodent eye. Variational revealed that not all variation...

Optical constants for evaporated bismuth (Bi) films were measured by ellipsometry and compared with those published single crystal melt-cast polycrystalline Bi in the wavelength range of 1 to 40 μm. The bulk plasma frequency ωp high-frequency limit permittivity ε∞ determined from long-wave portion spectrum, taking previously values relaxation time τ effective mass m . This part complex spectrum was confirmed comparing calculated reflectivity spectra far-infrared. Properties surface...

Material characteristics and crystallinity of germanium antimony telluride (GST), along with a design experimental verification transmission filter in the mid-infrared are presented. Gradually increasing temperature an annealed phase change material, such as GST, controls amount which allows index refraction to increase continuously over significant range. GST is incorporated into metal-dielectric sub-wavelength grating, dielectric segments grating spaced out sufficiently decouple...