Enhanced transmission through nano-aperture on a tapered metallic substrate

C. M. Wang, B. Ung, Y. Sheng, J. Y. Chang

研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)


The optical transmission and distribution through a subwavelength slit on a tapered metallic substrate was investigated. By using a 45° tapered structure rather than a traditional metallic plate, a 6-fold transmission enhancement could be achieved. This is due to the asymmetrical excitation of surface waves and the matching of propagation constants between the surface waves and slit waveguide. In addition, by patterning surface corrugations in the exit plane, the beam could be focused. By tuning the period of the surface corrugations, we were able to adjust the focal length. For an input wavelength of 0.5 μm, the focal point could be kept within 0.6 μm with a focal length extending from 0.5 μm to 2.5 μm and a grating period ranging from 0.5 μm to 0.6 μm.

頁(從 - 到)678-682
期刊Optics Communications
出版狀態已出版 - 15 9月 2006


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