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 sub-set behaviors.
Highlights
Resonant nanostructures are used to tailor the optical response of large surfaces, and in particular to selectively enhance absorption or thermal emission [1]
Despite the complexity of this structure, both the analytical model and the B-spline Modal Method (BMM) tool are in perfect agreement, which confirms that the optical response of the structure is mainly determined by the fundamental groove mode
We have developed a one-mode analytical model able to accurately describe the optical response of 1D-groove assemblies
Summary
Resonant nanostructures are used to tailor the optical response of large surfaces, and in particular to selectively enhance absorption or thermal emission [1] For this purpose, Fabry-Perot nanocavities are among the most commonly studied nanostructures as they exhibit appealing features: angular tolerance, strong electromagnetic field enhancement, subwavelength dimensions, and possibility to tailor the spectral response on a large bandwidth [2,3,4]. Fabry-Perot nanocavities are among the most commonly studied nanostructures as they exhibit appealing features: angular tolerance, strong electromagnetic field enhancement, subwavelength dimensions, and possibility to tailor the spectral response on a large bandwidth [2,3,4] These nanocavities, which are typically made of a metal-insulator-metal stack, can be either horizontal (often referred to as MIM nanoantenna) or vertical (grooves) and still exhibit the same optical behavior [5]. The behavior of such disordered combinations of grooves can be well described by the behavior of the subsets
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