Graphene plasmonics for light trapping and absorption engineering

Abstract

Plasmonics can be used to improve absorption in optoelectronic devices and has been intensively studied for solar cells and photodetectors. Graphene has recently emerged as a powerful plasmonic material. It shows significantly less losses compared to traditional plasmonic materials such as gold and silver and its plasmons can be tuned by changing the Fermi energy with chemical or electrical doping. Here we propose the usage of graphene plasmonics for light trapping in optoelectronic devices and show that the excitation of localized plasmons in doped, nanostructured graphene can enhance optical absorption in its surrounding media including both bulky and two-dimensional materials by tens of times, which may lead to a new generation of highly efficient, spectrally selective photodetectors in mid-infrared and THz ranges. The proposed concept could even revolutionize the field of plasmonic solar cells if graphene plasmons in the visible and near-infrared are realized.

20 pages, 6 figures

References in corpus (9)

• Electric Field Effect in Atomically Thin Carbon Films
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Graphene plasmonics
• Two-Dimensional Material Nanophotonics
• Manipulating infrared photons using plasmons in transparent graphene superlattices
• Optical far-infrared properties of graphene monolayer and multilayers
• The optical conductivity of graphene in the visible region of the spectrum
• Space-time dispersion of graphene conductivity
• A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics