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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 9 — Sep. 1, 2013
  • pp: 2461–2468

Graphene-supported tunable waveguide structure in the terahertz regime

Xiaoyong He and Sangin Kim  »View Author Affiliations


JOSA B, Vol. 30, Issue 9, pp. 2461-2468 (2013)
http://dx.doi.org/10.1364/JOSAB.30.002461


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Abstract

The tunable waveguide properties of the graphene supporting structure SiSiO2–graphene–dielectrics–graphene–SiO2Si (SiSiO2GDGSiO2Si) have been investigated in the terahertz regime by using the finite element method (FEM) and transfer matrix method (TMM). The study shows that the numerical results obtained from FEM and TMM agree well. The contour results show that as the frequency increases, the effective index increases, and the loss shows a peak; with the increase in the Fermi level, the effective index decreases, and the loss decreases. With a smaller effective mode area, the confinement of the SiSiO2GDGSiO2Si structure is much better than that of the Si–dielectrics–graphene–dielectrics–Si structure. The propagation properties of the structure can be modulated by using the applied gate voltage. The modulation depth of the propagation losses can reach more than 90%. The results are helpful to the design of tunable graphene optoelectronic devices, such as polarizers, modulators, and metamaterial devices.

© 2013 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(040.2235) Detectors : Far infrared or terahertz
(050.6624) Diffraction and gratings : Subwavelength structures
(310.6628) Thin films : Subwavelength structures, nanostructures
(170.6795) Medical optics and biotechnology : Terahertz imaging

ToC Category:
Optics at Surfaces

History
Original Manuscript: July 12, 2013
Manuscript Accepted: July 29, 2013
Published: August 26, 2013

Citation
Xiaoyong He and Sangin Kim, "Graphene-supported tunable waveguide structure in the terahertz regime," J. Opt. Soc. Am. B 30, 2461-2468 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-9-2461

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