Enhance transmission through a subwavelength slit on a bending metal substrate

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

doi:10.1117/12.616117

18 August 2005 Enhance transmission through a subwavelength slit on a bending metal substrate

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

Proceedings Volume 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III; 59270V (2005) https://doi.org/10.1117/12.616117
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

C. M. Wang, C. L. Hsu, J. Y. Chang, and C. C. Lee "Enhance transmission through a subwavelength slit on a bending metal substrate", Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 59270V (18 August 2005); https://doi.org/10.1117/12.616117

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