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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 17 — Aug. 15, 2011
  • pp: 16139–16153

The electromagnetics of light transmission through subwavelength slits in metallic films

John Weiner  »View Author Affiliations


Optics Express, Vol. 19, Issue 17, pp. 16139-16153 (2011)
http://dx.doi.org/10.1364/OE.19.016139


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Abstract

By numerically calculating the relevant electromagnetic fields and charge current densities, we show how local charges and currents near subwavelength structures govern light transmission through subwavelength apertures in a real metal film. The illumination of a single aperture generates surface waves; and in the case of slits, generates them with high efficiency and with a phase close to –π with respect to a reference standing wave established at the metal film front facet. This phase shift is due to the direction of induced charge currents running within the slit walls. The surface waves on the entrance facet interfere with the standing wave. This interference controls the profile of the transmission through slit pairs as a function of their separation. We compare the calculated transmission profile for a two-slit array to simple interference models and measurements [Phys. Rev. B 77(11), 115411 (2008)].

© 2011 OSA

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 7, 2011
Revised Manuscript: July 15, 2011
Manuscript Accepted: July 17, 2011
Published: August 9, 2011

Citation
John Weiner, "The electromagnetics of light transmission through subwavelength slits in metallic films," Opt. Express 19, 16139-16153 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-17-16139


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