4.6 Article

Tunable large resonant absorption in a midinfrared graphene Salisbury screen

Journal

PHYSICAL REVIEW B
Volume 90, Issue 16, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.165409

Keywords

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Funding

  1. Air Force Office of Scientific Research under Multidisciplinary University Research Initiative [FA9550-12-1-0488, FA9550-12-1-0024]
  2. Department of Energy, Office of Science [DE-FG02-07ER46405]
  3. R&D Program of the Global Frontier Center for Multiscale Energy Systems - National Research Foundation under the Ministry of Science, ITC & Future Planning, Korea [2011-0031561, 2011-0031577]
  4. POSCO T. J. Park Foundation
  5. Kavli Nanoscience Institute
  6. Resnick Sustainability Institute at Caltech
  7. Samsung Fellowship

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The optical absorption properties of periodically patterned graphene plasmonic resonators are studied experimentally as the graphene sheet is placed near a metallic reflector. By varying the size and carrier density of the graphene, the parameters for achieving a surface impedance closely matched to free-space (Z(0) = 377 Omega) are determined and shown to result in 24.5% total optical absorption in the graphene sheet. Theoretical analysis shows that complete absorption is achievable with higher doping or lower loss. This geometry, known as a Salisbury screen, provides an efficient means of light coupling to the highly confined graphene plasmonic modes for future optoelectronic applications.

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