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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 4,
  • Issue 1,
  • pp. 52-54
  • (2006)

Optical transmission enhancement by a sub-wavelength film lens

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Abstract

A new sub-wavelength metallic film lens configuration is proposed, which is embedded in a thin ideal metal film, and its near field optical properties are investigated by finite-difference time-domain (FDTD) method. It is found that the optical transmission is greatly enhanced, and the spot size can be reduced by the sub-wavelength metallic film lens in comparison with the bare aperture. This kind of lens is expected to have practical applications in the very small aperture laser (VSAL), a promising nanosource for near-field optical storage and lithography.

© 2005 Chinese Optics Letters

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