Graphene has emerged as a promising platform for THz metasurfaces supporting electrically tunable deep-subwavelength plasmonic excitations. Here, we introduce a broadband graphene metasurface based on the Hilbert curve, a continuous, space-filling fractal. We demonstrate the enhancement of graphene absorption over a broad frequency band (0.5–60 THz) with an average absorption level exceeding 20%. Owing to the continuous nature of the metasurface patterns, both the absorption level and the bandwidth can be controlled electrically by varying the graphene charge-carrier concentration.
- Received 26 April 2016
DOI:https://doi.org/10.1103/PhysRevApplied.6.044019
© 2016 American Physical Society
Interdisciplinary Physics
Source: http://link.aps.org/doi/10.1103/PhysRevApplied.6.044019
