Applied Physics Letters, 2014, 105(3): 031905

Enhancement of near-infrared absorption in graphene with metal gratings

 B. Zhao¹, J. M. Zhao^1,2and Z. M. Zhang^1,*

¹ G.W. Woodruff School ofMechanical Engineering

Georgia Institute of Technology, Atlanta,Georgia 30332, USA

²School of EnergyScience and Engineering

Harbin Instituteof Technology, Harbin, People’s Republic of China

ABSTRACT

Graphene has beendemonstrated as a good candidate for ultrafast optoelectronic devices. However,graphene is essentially transparent in the visible and near infrared with an absorptivityof 2.3%, which has largely limited its application in photon detection. Thisletter demonstrates that the absorptance in a monatomic graphene layer can be greatly enhanced to nearly 70%, thanks to the localized strong electric field resultingfrom magnetic resonances in deep metal gratings. Furthermore, the resonance frequency is essentially not affected by the additional graphene layer. The method presented here may benefit the design of next-generation graphene-based opticaland optoelectronic devices.

paper link: http://scitation.aip.org/content/aip/journal/apl/105/3/10.1063/1.4890624

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