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Design of ultra-broadband graphene absorber using circuit theory

Khavasi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1364/JOSAB.32.001941
  3. Abstract:
  4. I propose a novel method for designing a broadband THz absorber by using periodic arrays of graphene ribbons on a Salisbury-screen-like structure. The recently proposed analytical circuit model of graphene arrays is used for obtaining analytical expressions for the input admittance of the proposed device. The input admittance is then adjusted to be closely matched to the free space in a wide frequency range. Consequently, it is demonstrated that a bandwidth of 90% absorption can be extended up to 100% of the central frequency with only one layer of patterned graphene
  5. Keywords:
  6. Circuit theory ; Analytical circuit models ; Analytical expressions ; Central frequency ; Graphene ribbons ; Input admittance ; Salisbury screen ; Ultra-broadband ; Wide frequency range ; Graphene
  7. Source: Journal of the Optical Society of America B: Optical Physics ; Volume 32, Issue 9 , 2015 , Pages 1941-1946 ; 07403224 (ISSN)
  8. URL: https://www.osapublishing.org/josab/abstract.cfm?uri=josab-32-9-1941