Epioptics: Linear and Nonlinear Optical Spectroscopy of Surfaces and Interfaces

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  1. Weaire, D. L.
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Weaire, D. L.

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May not contain Access Codes or Supplements. May be ex-library. Buy with confidence, excellent customer service!. Condition: Very Good. Great condition with minimal wear, aging, or shelf wear. Published by Oxford University Press Interband optical transitions have been considered in the ensemble of toroidal QDs. The selection rules for quantum transitions and absorption edge dependence on the geometrical parameters have been obtained.

The absence of correlations between the two quantities is demonstrated. This ratio decreases quickly when the nanocrystals size is increased. Surface-to-volume ratio controls the radiation of stratified plasmonic antennas.


The surface plasmon generation is therefore strongly determined by the accessibility of the surface to the incoming electromagnetic field. We demonstrate the role of this surface for plasmonic nanoantennas with identical volumes and resonant lengths. An antenna is stratified parallel to the plane of its main dipolar resonance axis and the influence of the number of layers and the spacing between them on the optical properties of the antenna are investigated experimentally.

We show that increasing the number of layers and, hence, increasing the total accessible surface of the antenna, results in an enhanced scattering cross section and a redshift which indicates that lower energy photons are required to couple to the metal electrons.

Characterization of emission from aggregated gold nanoparticles excited nonlinearly by nm femtosecond laser. Aggregate forms are correlated to emission by scanning electron microscope imaging and pattern matching. Broad spectra in the visible region are obtained from aggregated GNPs, and their emission power exhibits a quadratic power dependence and an exponential decay in time due to morphology change.

Polarization analysis reveals that longitudinal plasmonic modes play important roles for nonlinear emission.

Relationships between brightness and morphology show that a large number of aggregates produce luminescence enhancement but with associated photo damage. It is proposed that characteristics of nonlinear emission from GNPs are explained by plasmon enhanced polarized hot electrons. Finite-difference time-domain modeling of monolayer graphene devices at near-infrared wavelengths.

Fatemeh Davoodi , Nosrat Granpayeh. A finite-difference time-domain FDTD discretization of the dispersive conductivity of monolayer graphene has been done at the wavelength of 1. The FDTD discretization is used to simulate a monolayer graphene plasmonic waveguide and a graphene surface plasmon polariton add—drop filter. The results show that the implementation of this method is surprisingly consistent with the results of the previous works and theoretical method.

Our proposed method does not suffer from the deficiencies of the subcell and surface boundary condition methods. Both the interband and the intraband terms of the graphene conductivity are used to implement the graphene simulation.

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Our proposed method is useful for the analysis of monolayer graphene devices at near-infrared wavelengths with less computational complexity. Vapor and liquid optical monitoring with sculptured Bragg microcavities. Sculptured porous Bragg microcavities BMs formed by the successive stacking of columnar SiO2 and TiO2 thin films with a zig-zag columnar microstructure are prepared by glancing angle deposition. These BMs act as wavelength-dependent optical retarders.

This optical behavior is attributed to a self-structuration of the stacked layers involving the lateral association of nanocolumns in the direction perpendicular to the main flux of particles during the multilayer film growth, as observed by focused ion beam scanning electron microscopy. The retardance of these optically active BMs can be modulated by dynamic infiltration of their open porosity with vapors, liquids, or solutions with different refractive indices.

The tunable birefringence of these nanostructured photonic systems has been successfully simulated with a simple model that assumes that each layer within the BMs stack has uniaxial birefringence. The sculptured BMs have been incorporated as microfluidic chips for optical transduction for label-free vapor and liquid sensing. Several examples of the detection performance of these chips, working either in reflection or transmission configuration, for the optical monitoring of vapor and liquids of different refractive indices and aqueous solutions of glucose flowing through the microfluidic chips are described.

Tunable surface waves in nonlinear graphene-based one-dimensional-photonic crystal. The nonlinear TE surface waves guided by an interface of a semi-infinite Kerr-type dielectric medium and a one-dimensional graphene-based photonic crystal have been investigated using the transfer-matrix method. It is shown that increasing the intensity of the incident beam drastically changes dispersion behavior inside the graphene-induced photonic band gap as a result of nonlinearity. Also regarding the simulation results, it reveals that the peculiar dispersion that is governed by a nonlinear structure appeared to be tuned by graphene conductivity via an external electric field.

Applying such an electric field makes it possible to easily tune the nonlinear surface waves at the desired frequency only by adjusting the chemical potential of the graphene.

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Also, it is shown that for application purposes, the results of studies can be applied to the case in which graphene nanolayers are embedded by identical dielectric constant, i. Polarization independent triple-band 5,4 semiconducting carbon nanotube metamaterial absorber design for visible and ultraviolet regions.

Various metamaterial absorber designs operating in the microwave, infrared, visible, and ultraviolet frequency regions have been proposed in the literature. However, only a few studies have been done on the metamaterials that absorb in both visible and ultraviolet solar spectra. A triple-band polarization-insensitive metamaterial absorber structure with semiconducting single-walled carbon nanotube as the dielectric layer is proposed to efficiently absorb the incident electromagnetic radiations in visible and ultraviolet frequency regions. A unit cell of this design comprises three basic components in the form of metal—semiconductor—metal layers.

Epioptics: linear and non-linear optical spectroscopy of surfaces and interfaces

The metallic part of the structure is aluminum, and the 5,4 single-walled carbon nanotube is used as the semiconducting material. The electromagnetic response of the proposed design is numerically simulated in the visible and ultraviolet regions with the maximum absorption rates of Thus, solar cells based on this metamaterial absorber can offer nearly perfect absorption in the suggested frequency regions. The simple configuration of the design provides flexibility to control geometric parameters to be used in the solar cell and possesses the capability to be rescaled for other solar spectrum.

Plasmon-induced transparency in a rectangle cavity and an H-shaped structure for sensing and switching applications. Yadollah Shahamat , Mohammad Vahedi.

Surfaces and interfaces

An implementation of plasmon-induced transparency PIT composed of a bus waveguide coupled to a rectangular nanocavity and an H-shape resonator is studied. It is shown that the wavelength, transmission, and width of the PIT peak can be tuned by adjusting the geometrical parameters of the H-resonator, such as the gap between the resonators, width, and position of the middle slit among the branches.

For avoiding oxidization of the structure, the effect of coating a thin graphene layer on the inner walls of the H-resonator is investigated. Two-dimensional fivefold photonic crystal microcavity.

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Fivefold photonic crystal PC structure is originally presented with theoretical investigation about its photonic band gap through transmission spectrum calculated by finite-difference time-domain methods. The existence of PC band gap makes it possible for defect structures with high-quality factor. Two types of fivefold PC microcavity are proposed of which the quality factor, normalized frequency, and electromagnetic field profile have been simulated. Theoretical investigation of detection accuracy of surface plasmon resonance sensor with dielectric layer. Chengyou Lin , Shujing Chen.

We theoretically investigated detection accuracy DA of a surface plasmon resonance SPR sensor with a top dielectric layer. The effects of the variation of thickness and the material of the dielectric layer on the DA of the SPR sensor were investigated. The result indicated that adding a top dielectric layer with a small refractive index less than the refractive index of the analyte can improve the DA of a traditional SPR sensor. In addition, by comparing the variation law of the DA and the electric field intensity at the analyte—dielectric interface of the SPR sensor, we studied the physical mechanism of DA variation.

This study can be helpful for high-performance SPR sensor development. Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide. We proposed and theoretically investigated a hybrid plasmonics waveguide consisting of a tiptilted quadrate nanowire, which was embedded in a low-permittivity dielectric and placed on a metal substrate with a small gap distance. Due to the corner effect, the hybrid mode with extremely local field enhancement has the long propagation length and strong coupling strength between the dielectric nanowire and metal.

The use of a naturally dielectric wedge tip of quadrate nanowire that can be chemically synthesized provides an efficient approach to circumvent the fabrication difficulty of shape wedge tips.