Abstract
Metamaterials have recently enabled coupling induced transparency due to interference effects in coupled subwavelength resonators. In this work, we present a three dimensional (3-D) metamaterial design with six-fold rotational symmetry that shows electromagnetically induced transparency with a strong polarization dependence to the incident electromagnetic wave due to the ultra-sharp resonance line width as a result of interaction between the constituent meta-atoms. However, when the six-fold rotationally symmetric unit cell design was re-arranged into a fourfold rotational symmetry, we observed the excitation of a polarization insensitive dual-band transparency. Thus, the 3-D split-ring resonators allow new schemes to observe single and multi-band classical analogues of electromagnetically induced transparencies that has huge potential applications in slowing down light, sensing modalities, and filtering functionalities either in the passive mode or the active mode where such effects could be tuned by integrating materials with dynamic properties.
Highlights
Metamaterials have recently enabled coupling induced transparency due to interference effects in coupled subwavelength resonators
We designed the 3-D metamaterial with a unit cell as shown in Fig. 1(a), where each SRR has a split gap on the top panel and a continuous wire in the bottom
The proposed metallic unit cell has six-fold (C6) rotational symmetry. This C6 symmetric unit cell with square periodicity on the dielectric substrate
Summary
Metamaterials have recently enabled coupling induced transparency due to interference effects in coupled subwavelength resonators. Electric as well as magnetic dipolar and high-order multipolar coupling are the commonly employed strategies to induce interference effects in subwavelength plasmonic and metamaterial resonators. A hybridization process occurs when these nanoparticle clusters are excited by the incident light It is the excitation of the multipoles that would induce a destructive interference (anti-bonding effect), which is a dominating approach to observe effects such as classical analog of electromagnetically induced transparency (EIT) phenomenon and the related Fano resonance phenomena[4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. By re-arranging the polarization sensitive six-fold rotationally symmetric unit cells in a four-fold rotational symmetry configuration, we obtained a polarization insensitive transparency feature that exhibits dual-mode transparency windows
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