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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 6 — Jun. 1, 2012
  • pp: 782–788

Terahertz surface plasmon polaritons on freestanding multi-walled carbon nanotube aerogel sheets

T. D. Nguyen, S. Liu, M. D. Lima, S. Fang, R. H. Baughman, A. Nahata, and Z. V. Vardeny  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 6, pp. 782-788 (2012)
http://dx.doi.org/10.1364/OME.2.000782


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Abstract

We demonstrate that multi-walled carbon nanotubes (MWCNTs) are capable of supporting surface plasmon-polaritons (SPPs) at terahertz (THz) frequencies. To achieve this, we fabricated sub-100 μm-thick freestanding and highly oriented multi-walled carbon nanotube (MWCNT) aerogel sheets. Utilizing terahertz time-domain spectroscopy, we measured the complex index of refraction of the sheets for two orthogonal nanotube orientations. We found that the MWCNT sheets exhibit highly anisotropic THz polarization behavior. Based on the extracted dielectric properties of the medium, which show that it exhibits metallic behavior in the THz spectral range, we investigated the existence and propagation of SPPs by studying the resonantly enhanced transmission through periodic MWCNT hole arrays. We found that carbon nanotubes support SPP excitations that propagate along the tubes, but highly suppress these surface waves in the direction perpendicular to the nanotubes.

© 2012 OSA

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(240.6680) Optics at surfaces : Surface plasmons
(260.3090) Physical optics : Infrared, far
(160.4236) Materials : Nanomaterials

ToC Category:
IR Materials

History
Original Manuscript: March 22, 2012
Revised Manuscript: May 4, 2012
Manuscript Accepted: May 5, 2012
Published: May 8, 2012

Virtual Issues
Nanocarbon for Photonics and Optoelectronics (2012) Optical Materials Express

Citation
T. D. Nguyen, S. Liu, M. D. Lima, S. Fang, R. H. Baughman, A. Nahata, and Z. V. Vardeny, "Terahertz surface plasmon polaritons on freestanding multi-walled carbon nanotube aerogel sheets," Opt. Mater. Express 2, 782-788 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-6-782


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