Enhance transmission through a subwavelength slit on a bending metal substrate

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

研究成果: 雜誌貢獻會議論文同行評審

1 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, 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.

頁(從 - 到)1-8
期刊Proceedings of SPIE - The International Society for Optical Engineering
出版狀態已出版 - 2005
事件Plasmonics: Metallic Nanostructures and Their Optical Properties III - San Diego, CA, United States
持續時間: 31 7月 20053 8月 2005


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