Fano Resonances in Metal Gratings with Sub-Wavelength Slits on High Refractive Index Silicon
Abdelhaq Belkacem,
Hammou Oubeniz,
Hicham Mangach,
Muamer Kadic,
Noureddine Cherkaoui Eddeqaqi,
Abdenbi Bouzid,
Younes Achaoui
Affiliations
Abdelhaq Belkacem
Laboratory of Optics, Information Processing, Mechanics, Energetics and Electronics, Department of Physics, Moulay Ismail University, Zitoune, Meknes B.P.11201, Morocco
Hammou Oubeniz
Laboratory of Optics, Information Processing, Mechanics, Energetics and Electronics, Department of Physics, Moulay Ismail University, Zitoune, Meknes B.P.11201, Morocco
Hicham Mangach
Light, Nanomaterials Nanotechnologies (L2n), CNRS-ERL7004, Université de Technologie de Troyes, 10000 Troyes, France
Muamer Kadic
Institut FEMTO-ST, UMR6174, CNRS, Université de Bourgogne Franche-Comté, 25000 Besançon, France
Noureddine Cherkaoui Eddeqaqi
Laboratory of Optics, Information Processing, Mechanics, Energetics and Electronics, Department of Physics, Moulay Ismail University, Zitoune, Meknes B.P.11201, Morocco
Abdenbi Bouzid
Laboratory of Optics, Information Processing, Mechanics, Energetics and Electronics, Department of Physics, Moulay Ismail University, Zitoune, Meknes B.P.11201, Morocco
Younes Achaoui
Laboratory of Optics, Information Processing, Mechanics, Energetics and Electronics, Department of Physics, Moulay Ismail University, Zitoune, Meknes B.P.11201, Morocco
The enhancement of optical waves through perforated plates has received particular attention over the past two decades. This phenomenon can occur due to two distinct and independent mechanisms, namely, nanoscale enhanced optical transmission and micron-scale Fabry–Perot resonance. The aim of the present paper is to shed light on the coupling potential between two neighboring slots filled with two different materials with contrasting physical properties (air and silicon, for example). Using theoretical predictions and numerical simulations, we highlight the role of each constituent material; the low-index material (air) acts as a continuum, while the higher-index material (silicon) exhibits discrete states. This combination gives rise to the so-called Fano resonance, well known since the early 1960s. In particular, it has been demonstrated that optimized geometrical parameters can create sustainable and robust band gaps at will, which provides the scientific community with a further genuine alternative to control optical waves.
