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Published June 21, 2019 | Version v1
Journal article Open

Graphene-Based Cylindrical Pillar Gratings for Polarization-Insensitive Optical Absorbers

Authors/Creators

  • 1. Dipartimento di Ingegneria Elettrica e dell'Informazione, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy
  • 2. Istituto di Nanotecnologia—CNR-NANOTEC, Via Orabona 4, 70125 Bari, Italy
  • 3. Center for Bio-Molecular Nanotechnology, Istituto Italiano di Tecnologia (IIT), Via Barsanti, 73010 Arnesano, Lecce, Italy
  • 4. Department of Information Engineering, University of Brescia, Via Branze 38, 25121 Brescia, Italy
  • 5. Department of Information Engineering, University of Padova, Via Gradenigo 6/b, 35131 Padova, Italy
  • 6. Center for Bio-Molecular Nanotechnology, Istituto Italiano di Tecnologia (IIT), Via Barsanti, 73010 Arnesano, Lecce, Italy; Dipartimento di Ingegneria dell'Innovazione, Università del Salento, Via Arnesano, 73100 Lecce, Italy
  • 7. Charles M. Bowden Research Center, RDECOM, Redstone Arsenal, Huntsville, AL 35898-5000, USA
  • 8. Dipartimento di Ingegneria Elettrica e dell'Informazione, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy; Istituto di Nanotecnologia—CNR-NANOTEC, Via Orabona 4, 70125 Bari, Italy

Description

In this study, we present a two-dimensional dielectric grating which allows achieving high absorption in a monolayer graphene at visible and near-infrared frequencies. Dielectric gratings create guided-mode resonances that are exploited to effectively couple light with the graphene layer. The proposed structure was numerically analyzed through a rigorous coupled-wave analysis method. Effects of geometrical parameters and response to the oblique incidence of the plane wave were studied. Numerical results reveal that light absorption in the proposed structure is almost insensitive to the angle of the impinging source over a considerable wide angular range of 20°. This may lead to the development of easy to fabricate and experimentally viable graphene-based absorbers in the future.

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