Study of disordered metallic groove arrays with a one-mode analytical model

Abstract

Sub-wavelength metallic grooves behave as Fabry-Perot nanocavities able to resonantly enhance the absorption of light as well as the intensity of the electromagnetic field. Here, with a one-mode analytical model, we investigate the effect of a correlated disorder on 1D groove arrays i.e., randomly shaped and positioned grooves on a metallic layer. We show that a jitter-based disorder leads to a redistribution of energy compared to the periodic case. In an extreme case, a periodic diffracting array can be converted into a highly scattering array (98% at λ = 2.8 µm with a 1 µm full width at half maximum). Eventually, we show that the optical response of combinations of variously shaped grooves can be well described by the individual subset behaviors.

One mode-model in nanostructures with inclined sidewalls applied to nano Fabry-Perot structures

“…To circumvolute this issue and calculate the propagation of the propagating mode in the slit, we use in the following a one-mode model [4]. In that case, the inclined layer can be simulated using two regular structured layers, one with the width at the top of the By retrieving the respective scattering matrices, the interfaces of the inclined layer can be simulated.…”