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Comparison of gold- and graphene-based resonant nanostructures for terahertz metamaterials and an ultrathin graphene-based modulator

N. H. Shen ; Philippe Tassin (Institutionen för teknisk fysik, Kondenserade materiens teori) ; T. Koschny ; C. M. Soukoulis
Physical Review B (1098-0121). Vol. 90 (2014), 11, p. 115437.
[Artikel, refereegranskad vetenskaplig]

Graphene exhibits unique material properties, and in electromagnetic wave technology it raises the prospect of devices miniaturized down to the atomic length scale. Here we study split-ring resonator metamaterials made from graphene and we compare them to gold-based metamaterials. We find that graphene's huge reactive response derived from its large kinetic inductance allows for deeply subwavelength resonances, although its resonance strength is reduced due to higher dissipative loss damping and smaller dipole coupling. Nevertheless, tightly stacked graphene rings may provide for negative permeability and the electric dipole resonance of graphene meta-atoms turns out to be surprisingly strong. Based on these findings, we present a terahertz modulator based on a metamaterial with a multilayer stack of alternating patterned graphene sheets separated by dielectric spacers. Neighboring graphene flakes are biased against each other, resulting in modulation depths of over 75% at a transmission level of around 90%.



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Denna post skapades 2014-11-25. Senast ändrad 2015-03-09.
CPL Pubid: 206543

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)

Ämnesområden

Nanovetenskap och nanoteknik
Den kondenserade materiens fysik

Chalmers infrastruktur