A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics

TitleA comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics
Publication TypeJournal Article
Year of Publication2012
AuthorsTassin P, Koschny T, Kafesaki M, Soukoulis CM
Journal TitleNature Photonics
Volume6
Pages259-264
Date Published04
Type of ArticleArticle
ISBN Number1749-4885
Accession NumberWOS:000302232300022
Keywordsfilms, light, limit, negative-index, optical metamaterials, refraction, SURFACE-PLASMONS, transparency
Abstract

Recent advancements in metamaterials and plasmonics have promised a number of exciting applications, in particular at terahertz and optical frequencies. Unfortunately, the noble metals used in these photonic structures are not particularly good conductors at high frequencies, resulting in significant dissipative loss. Here, we address the question of what is a good conductor for metamaterials and plasmonics. For resonant metamaterials, we develop a figure-of-merit for conductors that allows for a straightforward classification of conducting materials according to the resulting dissipative loss in the metamaterial. Application of our method predicts that graphene and high-T-c superconductors are not viable alternatives for metals in metamaterials. We also provide an overview of a number of transition metals, alkali metals and transparent conducting oxides. For plasmonic systems, we predict that graphene and high-T-c superconductors cannot outperform gold as a platform for surface plasmon polaritons, because graphene has a smaller propagation length-to-wavelength ratio.

URL<Go to ISI>://WOS:000302232300022
DOI10.1038/nphoton.2012.27
Alternate JournalNat. Photonics