Optical resonances in the scattering of light from a nanostructured metal surface: A three-dimensional numerical study

Abstract

We present the full three-dimensional numerical study of the scattering of light by the gold substrate composed of square periodic array of inverted pyramidal pits. The time-dependent wave-packet-propagation approach was used to extract the complete scattering matrix as well as the near fields. The role of the pit-localized and surface-supported plasmonic modes in resonant reflection spectra and field enhancement is revealed. We show that the resonances in the specular reflection arise because of the excitation of the pitlocalized plasmons while resonant absorption is linked with excitation of the surface-plasmon polaritons. For certain structure parameters absorption can reach 100%. Our theoretical results are in a good agreement with recently published experimental data ͓N. M. B. Perney et al., Opt. Express 14, 847 ͑2006͒; Phys. Rev. B 76, 035426 ͑2007͔͒. We also show that present structure allows one to obtain zero specular reflection where all scattered intensity is redirected into the grazing beams.

A facile method for the synthesis of highly monodisperse silica@gold@silica core–shell–shell particles and their use in the fabrication of three-dimensional metallodielectric photonic crystals

“…4a; 3). Our findings suggest that the reduction in reflected intensity is attributable to the metal plasmonic absorption and scattering, 124 rather than the introduction of enhanced disorder within the structure. In order to establish the major factor contributing to the band gap broadening, we have considered the factors that could cause the band gap broadening in photonic crystals, such as (i) the disorder in the fcc structure, (ii) the layer thickness, and (iii) the dielectric contrast of the composite PC.…”

Plasmons in Strongly Coupled Metallic Nanostructures

“…Although a variety of computational tools have been developed for modeling the electromagnetic properties of metallic nanostructures, − an analytical theoretical method has also been developed that provides a physically intuitive picture of coupled plasmons in complex nanostructures . In the plasmon hybridization method, the plasmon modes of a complex nanostructure are expressed in terms of interactions between the plasmon resonances of its elementary components.…”

On surface plasmon polariton wavepacket dynamics in metal–dielectric heterostructures

“…i is essentially frequency dependent and is well described by the Drude-Sommerfeld model. There are two characteristic frequencies of the system: 12 ω and 13 ω given…”

“…The pulse dispersion and dissipation were studied both numerically and experimentally. The propagation of the SPP pulses in nanostructured media has received much attention with some interesting results [8][9][10][11][12][13][14][15][16][17][18]. Thus, in [9] the authors studied the SPP propagation along a 90 • bent line defect in a periodically corrugated metal surface.…”

“…It can be shown that for frequencies12 ω ω <the dependence of the SPPs dispersion on the thickness h is monotonic implying that for relatively small values of h the dispersion curve ) (κ ω is close to the dispersion curve of the SPP at the interface between the metal and air ) ( 13 κ ω and for sufficiently large values of h the dispersion curve ) (κ ω is close to the dispersion curve of the SPP at the interface between the metal and the dielectric ) ( 12 κ ω while for the intermediate values of h it is somewhere in between:…”