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Broadband, polarization-insensitive, and wide-angle optical absorber based on fractal plasmonics

Eshaghian Dorche, A ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1109/LPT.2016.2605503
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2016
  4. Abstract:
  5. In this paper, a plasmonic absorber consisting of a metal-dielectric-metal stack with a top layer of Sierpinski nanocarpet is theoretically investigated. Such a compact absorber depicts broadband angle-independent behavior over a wide optical wavelength range (400 700 nm) and a broad range of incidence angles (0 80). Including several feature sizes, such a fractal-like structure shows average simulated extinction response of 0:85 for either transverse electric or magnetic polarization states under normal incidence. Underlying mechanisms of absorbance due to excited surface plasmon modes as well as electric/magnetic dipole resonances are well revealed by investigating electric field, magnetic field, and current distributions. The proposed absorber opens a path to realize highperformance ultrathin light trapping devices
  6. Keywords:
  7. Fractals structures ; Plasmonic absorber ; Electric fields ; Fractals ; Polarization ; Current distribution ; Fractallike structures ; Magnetic polarizations ; Optical wavelength ; Plasmonic absorber ; Polarization-insensitive ; Surface plasmon modes ; Transverse electrics ; Plasmons
  8. Source: IEEE Photonics Technology Letters ; Volume PP, Issue 99 , 2016 ; 10411135 (ISSN)
  9. URL: http://ieeexplore.ieee.org/document/7558125