Journal
MATERIALS
Volume 16, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/ma16216982
Keywords
discrete state; continuum state; Fano resonance; surface plasmon; FEM method; RCWA method
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This paper investigates the mechanisms of enhancing optical waves through perforated plates and explores the coupling potential between different materials. It is found that optimized geometrical parameters can create controllable band gaps for optical waves.
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.
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