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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 36 — Dec. 20, 2007
  • pp: 8573–8577

Near-field scattered by a single nanoslit in a metal film

Lionel Aigouy, Philippe Lalanne, Haitao Liu, Gwénaelle Julié, Véronique Mathet, and Michel Mortier  »View Author Affiliations


Applied Optics, Vol. 46, Issue 36, pp. 8573-8577 (2007)
http://dx.doi.org/10.1364/AO.46.008573


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Abstract

Using a scanning near-field optical microscope, we visualize, in three dimensions, the electromagnetic field distribution near an isolated slit aperture in a thin gold film. At the metal-air interface and for a TM incident polarization, we confirm some recently observed results and show that the slit generates two kinds of surface waves: a slowly decaying surface plasmon polariton and a quasi-cylindrical wave that decreases more rapidly when moving away from the slit. These waves are not generated for a TE incident polarization. In a noncontact mode, we also observe how the transmitted light diverges in free space. At a small distance from the slit ( < 2 μ m ) , we find that the emerging light spreads in all directions for TM, forming an electromagnetic cloud, whereas it is concentrated above the slit for TE, forming a more directive light jet. The experimental images are in good agreement with the numerical simulations.

© 2007 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

History
Original Manuscript: August 27, 2007
Manuscript Accepted: October 22, 2007
Published: December 13, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Lionel Aigouy, Philippe Lalanne, Haitao Liu, Gwénaelle Julié, Véronique Mathet, and Michel Mortier, "Near-field scattered by a single nanoslit in a metal film," Appl. Opt. 46, 8573-8577 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-36-8573

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