Enhance transmission through a subwavelength slit on a bending metal substrate

C. M. Wang, C. L. Hsu, J. Y. Chang, C. C. Lee

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


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.

Original languageEnglish
Article number59270V
Pages (from-to)1-8
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventPlasmonics: Metallic Nanostructures and Their Optical Properties III - San Diego, CA, United States
Duration: 31 Jul 20053 Aug 2005


  • Nano optics
  • Subwavelength aperture


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