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Terahertz spectrum splitting by a graphene-covered array of rectangular grooves

Tavakol, M. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1364/OL.42.004808
  3. Abstract:
  4. We propose a bidirectional terahertz (THz) spectrum splitter using a practically simple metamaterial structure consisting of rectangular grooves covered by graphene. Thanks to the graphene optoelectronic tunability and by adjusting the grooves width, this structure provides nearly 2π phase shift. At the same time, the reflection efficiency is acceptable throughout the phase shifts. We design each of the meta-atoms using a circuit model, and then we synthesize the final supercell based on the generalized Snell’s law so that the structure reflects different frequency waves to totally different directions. The full-wave simulations demonstrate the beam splitting with a remarkable efficiency of around 80%. © 2017 Optical Society of America
  5. Keywords:
  6. Efficiency ; Metamaterials ; Beam splitting ; Circuit modeling ; Different frequency ; Full-wave simulations ; Metamaterial structures ; Rectangular groove ; Reflection efficiency ; Terahertz spectra ; Graphene
  7. Source: Optics Letters ; Volume 42, Issue 23 , 2017 , Pages 4808-4811 ; 01469592 (ISSN)
  8. URL: https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-23-4808