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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 10 — May. 15, 2014
  • pp: 2990–2993

Deep-subwavelength negative-index waveguiding enabled by coupled conformal surface plasmons

R. Quesada, D. Martín-Cano, F. J. García-Vidal, and J. Bravo-Abad  »View Author Affiliations

Optics Letters, Vol. 39, Issue 10, pp. 2990-2993 (2014)

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In this Letter we introduce a novel route for achieving negative-group-velocity waveguiding at deep-subwavelength scales. Our scheme is based on the strong electromagnetic coupling between two conformal surface plasmon structures. Using symmetry arguments and detailed numerical simulations, we show that the coupled system can be geometrically tailored to yield negative-index dispersion. A high degree of subwavelength modal confinement, of λ/10 in the transversal dimensions, is also demonstrated. These results can assist in the development of ultrathin surface circuitry for the low-frequency region (microwave and terahertz regimes) of the electromagnetic spectrum.

© 2014 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(230.7390) Optical devices : Waveguides, planar
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

Original Manuscript: February 25, 2014
Revised Manuscript: April 9, 2014
Manuscript Accepted: April 9, 2014
Published: May 14, 2014

R. Quesada, D. Martín-Cano, F. J. García-Vidal, and J. Bravo-Abad, "Deep-subwavelength negative-index waveguiding enabled by coupled conformal surface plasmons," Opt. Lett. 39, 2990-2993 (2014)

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