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Self-Affine Graphene Metasurfaces for Tunable Broadband Absorption

Pin Chieh Wu1,2, Nikitas Papasimakis3,*, and Din Ping Tsai1,2,†

  • 1Department of Physics, National Taiwan University, Taipei 10617, Taiwan
  • 2Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
  • 3Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, United Kingdom

  • *n.papasimakis@soton.ac.uk
  • †dptsai@sinica.edu.tw
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Phys. Rev. Applied 6, 044019 – Published 28 October, 2016

DOI: https://doi.org/10.1103/PhysRevApplied.6.044019

Abstract

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.

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Phys. Rev. Applied 6, 044019– Published 28 October, 2016
  • Received 26 April 2016

© 2016 American Physical Society

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