Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device.

ABSTRACT: An optical device configuration allowing efficient electrical tuning of near total optical absorption in monolayer graphene is reported. This is achieved by combining a two-dimensional gold coated diffraction grating with a transparent spacer and a suspended graphene layer to form a doubly resonant plasmonic structure. Electrical tuneability is achieved with the inclusion of an ionic gel layer which plays the role of the gate dielectric. The underlying grating comprises a 2-dimensional array of inverted pyramids with a triple layer coating consisting of a reflective gold layer and two transparent dielectric spacers, also forming a vertical micro-cavity known as a Salisbury screen. Resonant coupling of plasmons between the gold grating and graphene result in strong enhancement of plasmon ex

SUBMITTER: Matthaiakakis N 

PROVIDER: S-EPMC5544744 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature