Tunable plasmonic metasurface for perfect absorption
Imperial College London, Department of Physics, The Blackett Laboratory, London
SW7 2AZ, UK
* e-mail: firstname.lastname@example.org
Accepted: 13 January 2017
Published online: 17 February 2017
Tunable metasurfaces, whose functionality can be dynamically modified, open up the possibility of ultra-compact photonic components with reconfigurable applications. Here we consider a graphene monolayer subject to a spatially periodic gate bias, which, thank to surface plasmons in the graphene, acts as a tunable and extremely compact metasurface for terahertz radiation. After characterizing its functionality, we show that it serves as the basic building block of an ultrathin complete absorber. In this subwavelength-thickness device, transmission and reflection channels are blocked and electromagnetic energy is completely absorbed by the metasurface building blocks. The proposed structure can be used as a modulator, and its frequency of operation can be changed by scaling its size or adjusting the doping level.
Key words: Graphene plasmonics / Tunable metasurface / Perfect absorption
© P.A. Huidobro et al., published by EDP Sciences, 2017
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