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Proceedings Paper

Enhance transmission through a subwavelength slit on a bending metal substrate
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Paper Abstract

The optical transmission and distribution through a subwavelength slit on a tapered metallic substrate was investigated. By using a 45° tapered structure, 6 times larger transmission enhancement was achieved compared with a traditional metallic plate structure because of the asymmetric excited surface waves and the matching of propagation constants between the surface waves and slit waveguide. In addition, a focus beam was obtained by patterning surface corrugations in the exit plane. By tuning the period of the surface corrugations, we were able to adjust the focal length with a spot size smaller than the diffraction limit. The focal point can be kept about 0.6μm with a focal length from 0.5μm to 2.5μm for a grating period from 0.5μm to 0.6μm.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 59270V (18 August 2005); doi: 10.1117/12.616117
Show Author Affiliations
C. M. Wang, National Central Univ. (Taiwan)
C. L. Hsu, National Central Univ. (Taiwan)
J. Y. Chang, National Central Univ. (Taiwan)
C. C. Lee, National Central Univ. (Taiwan)


Published in SPIE Proceedings Vol. 5927:
Plasmonics: Metallic Nanostructures and Their Optical Properties III
Mark I. Stockman, Editor(s)

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