Waveguiding through a two‐dimensional metallic photonic crystal

Abstract

SummaryWe present a two-dimensional (2D) finite-difference time domain simulation of the propagation of light through linear and bent channels in metallic photonic crystals. We took as a starting point the Bozhevolnyi experiment, consisting of the scattering of surface plasmons by a 2D structure of finitely sized periodic gold dots arranged in a triangular lattice of 400-nm period. We model injection and propagation of light through linear channels of different widths. We also study the behaviour of light in the presence of a 90 ° bent line defect made in the structure. We show that the confinement depends on the orientation of the input and output line defects. The two cases of Γ M and Γ K orientations are considered and a spectral study for five different wavelengths is carried out.

Theoretical analysis of ridge gratings for long-range surface plasmon polaritons

“…Microstructuring of planar metal surfaces has been pursued experimentally [7][8][9][10][11][12][13][14][15][16][17][18] and theoretically [19][20][21][22][23][24][25][26][27][28] by a number of researchers with the idea that such structures can be used to manipulate and control the propagation of light in the plane. This includes using a periodic surface microstructuring of metal interfaces and films to create a structure exhibiting a band gap for ͑LR͒SPP waves, i.e., a wavelength interval where propagation of ͑LR͒SPPs in the structure is inhibited.…”

Line defects in two-dimensional four-beam interference patterns

“…The pitch (corresponding to equation (5a)) or quasi pitch (corresponding to (5b)) and orientation of the defects can be controlled by the incident beam angles θ j in accordance with (4) and (5). The width of the defects varies with laser intensity and with the threshold of the target material.…”

“…They are thought to be promising materials for fabricating all-optical integrated circuits [1,2]. In particular, PhCs with artificial defects introduced into their structures are the topics of many theoretical [3]- [5] and experimental investigations [6]- [9]. Electron beam lithography (EBL) and focused ion beam (FIB) lithography are the most common techniques employed to prepare surface reliefs for PhCs with defects, but they are timeconsuming and expensive to use.…”

Far-Field Raman Imaging of Short-Wavelength Particle Plasmons on Gold Nanorods

“…For particles smaller than the wavelength of the incident light, strong optical extinction emerges in the visible or near-infrared spectral regions due to driven collective electron oscillations, the so-called localized surface plasmons (LSP). Knowledge on LSP resonance of metal particles is primordial for progressing in optical characterization and information processing in the submicrometer scale [3][4][5]. Recent advances in lithographic techniques have made it possible to efficiently control the optical properties of the particles on a scale compared to the wavelength of light [6].…”