Numerical analysis of a slit-groove diffraction problem

Abstract

http://www.jeos.org/index.php/jeos_rp/article/view/07022We present a comparison among several fully-vectorial methods applied to a basic scattering problem governed by the physics of the electromagnetic interaction between subwavelength apertures in a metal film. The modelled structure represents a slit-groove scattering problem in a silver film deposited on a glass substrate. The benchmarked methods, all of which use in-house developed software, include a broad range of fully-vectorial approaches from finite-element methods, volume-integral methods, and finite-difference time domain methods, to various types of modal methods based on different expansion techniques

Broadband and efficient plasmonic control in the near-infrared and visible via strong interference of surface plasmon polaritons

“…Here, Hx; z; E z x; z are the transverse field components of the total field scattered by the nanoslit pair, and [H SP− x; z, E SP− z x; z] are the analytically [15] calculated field components of the SPP mode, propagating in the −x direction with unit power flow at x w d∕2. All simulations of the electromagnetic fields are obtained with a fully vectorial aperiodic-Fourier-modal method [16,17], with the metal taken to be gold (data from Palik [18]). The fields associated with the CWs on the metal surface are obtained by subtracting the SPP modal fields from the total field [12].…”

Transmission characteristics in plasmonic multimode waveguides

“…The default values of the structural parameters are: metallic layer thickness t m = 0.12 µm; metallic layer width w m = 2.0 µm; permittivity of the surrounded medium ε d = 4.0 and the frequency dependent permittivity of silver ε m is obtained with the Drude model: ε m = ε ∞ − ω 2 p / ω 2 − jγ ω . Here we use the following parameters taken from (Besbes et al 2007): ε ∞ = 3.36174, ω p = 1.3388 × 10 16 s −1 , and γ = 7.07592 × 10 13 s −1 . By applying these parameters to the Drude model we obtain ε m = −14.79− j0.41 for the wavelength λ 0 = 0.6 µm and ε m = −21.34− j0.65 for the wavelength λ 0 = 0.7 µm.…”

Optical filtering properties of subwavelength Tai-chi-shaped metal hole arrays

“…[29], we use Drude parameters fit to empirical dielectric constant data for silver in a specific range of frequencies (or wavelengths). In particular, we use ε 1 ¼ 3.36174, ω p ¼ 1.3388 Â 10 16 rad/s, and γ¼7.07592 Â 10 13 rad/s, which are appropriate for describing wavelengths in visible and near infrared wavelengths.…”