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The tuned absorptance in multilayer graphene-dielectric structures by intraband transition

Journal Article


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Abstract


  • In this work, using the transfer-matrix method, the optical transport process is investigated, with graphene inserted into multilayer dielectric structures, theoretically and numerically in the THz regime. When the incident frequency is lower than the graphene Fermi energy, the optical intra-band transitions provide the main contribution to the graphene surface current. The absorptance can be enhanced to about 50% with only one graphene/dielectric layer in air. When increasing the number of dielectric layers coated with graphene, the absorption increases. Periodic absorption peaks are observed in multilayer structures. The positions of the absorption peaks as a function of the frequency and the incident angle are in accordance with the positions of the abrupt change in the reflection coefficient phase and of the imaginary solution of the Bloch wavevector in expanding periodic structures using Bloch theorem.

Authors


  •   Yang, C H. (external author)
  •   Wang, Guoxiu (external author)
  •   Chao Zhang
  •   Ao, Zhimin (external author)

Publication Date


  • 2017

Citation


  • Yang, C. H., Wang, G. X., Zhang, C. & Ao, Z. M. (2017). The tuned absorptance in multilayer graphene-dielectric structures by intraband transition. Journal of Applied Physics, 122 (13), 133109-1-133109-6.

Scopus Eid


  • 2-s2.0-85031803757

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2011&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1009

Start Page


  • 133109-1

End Page


  • 133109-6

Volume


  • 122

Issue


  • 13

Place Of Publication


  • United States

Abstract


  • In this work, using the transfer-matrix method, the optical transport process is investigated, with graphene inserted into multilayer dielectric structures, theoretically and numerically in the THz regime. When the incident frequency is lower than the graphene Fermi energy, the optical intra-band transitions provide the main contribution to the graphene surface current. The absorptance can be enhanced to about 50% with only one graphene/dielectric layer in air. When increasing the number of dielectric layers coated with graphene, the absorption increases. Periodic absorption peaks are observed in multilayer structures. The positions of the absorption peaks as a function of the frequency and the incident angle are in accordance with the positions of the abrupt change in the reflection coefficient phase and of the imaginary solution of the Bloch wavevector in expanding periodic structures using Bloch theorem.

Authors


  •   Yang, C H. (external author)
  •   Wang, Guoxiu (external author)
  •   Chao Zhang
  •   Ao, Zhimin (external author)

Publication Date


  • 2017

Citation


  • Yang, C. H., Wang, G. X., Zhang, C. & Ao, Z. M. (2017). The tuned absorptance in multilayer graphene-dielectric structures by intraband transition. Journal of Applied Physics, 122 (13), 133109-1-133109-6.

Scopus Eid


  • 2-s2.0-85031803757

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2011&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1009

Start Page


  • 133109-1

End Page


  • 133109-6

Volume


  • 122

Issue


  • 13

Place Of Publication


  • United States