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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 10, Iss. 24 — Dec. 2, 2002
  • pp: 1418–1424

Optical near field in nanometallic slits

Pei-Kuen Wei, Hsieh-Li Chou, and Wun-Shain Fann  »View Author Affiliations

Optics Express, Vol. 10, Issue 24, pp. 1418-1424 (2002)

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The propagation and the distribution of the optical near field in nanometallic slits are measured by a near-field scanning optical microscope. The optical near field for the p-polarized wave is confined to the middle of the slit. In contrast, the near field for the s-polarized wave is located at the edges. A simulation by the finite-difference time-domain method verifies that the near-field distribution for the s-polarized wave is due to the propagation of the surface plasmon wave (SPW) at the air-metal surface. The existence of the SPW also accounts for the extraordinary transmittance of s-polarized light, which is one order of magnitude larger than that of p-polarized light.

© 2002 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(100.6640) Image processing : Superresolution
(180.5810) Microscopy : Scanning microscopy
(240.0310) Optics at surfaces : Thin films

ToC Category:
Research Papers

Original Manuscript: August 26, 2002
Revised Manuscript: November 19, 2002
Published: December 2, 2002

Pei-Kuen Wei, Hsieh-Li Chou, and Wun-Shain Fann, "Optical near field in nanometallic slits," Opt. Express 10, 1418-1424 (2002)

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