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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15326–15335

Plasmon switching: Observation of dynamic surface plasmon steering by selective mode excitation in a sub-wavelength slit

S. B. Raghunathan, C. H. Gan, T. van Dijk, B. Ea Kim, H. F. Schouten, W. Ubachs, P. Lalanne, and T. D. Visser  »View Author Affiliations


Optics Express, Vol. 20, Issue 14, pp. 15326-15335 (2012)
http://dx.doi.org/10.1364/OE.20.015326


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Abstract

We report a plasmon steering method that enables us to dynamically control the direction of surface plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface plasmons more efficiently than the fundamental symmetric mode.

© 2012 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.1960) Physical optics : Diffraction theory
(310.2790) Thin films : Guided waves
(310.2785) Thin films : Guided wave applications
(250.5403) Optoelectronics : Plasmonics
(240.3990) Optics at surfaces : Micro-optical devices

ToC Category:
Optics at Surfaces

History
Original Manuscript: May 3, 2012
Revised Manuscript: June 11, 2012
Manuscript Accepted: June 14, 2012
Published: June 22, 2012

Citation
S. B. Raghunathan, C. H. Gan, T. van Dijk, B. Ea Kim, H. F. Schouten, W. Ubachs, P. Lalanne, and T. D. Visser, "Plasmon switching: Observation of dynamic surface plasmon steering by selective mode excitation in a sub-wavelength slit," Opt. Express 20, 15326-15335 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-14-15326


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