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Extraordinary Transmission through Metallic Grating with Subwavelength Slits for S-Polarization Illumination |
| YUAN Guang-Hui;WANG Pei;ZHANG Dou-Guo;JIAO Xiao-Jin;MIN Chang-Jun;MING Hai |
| Department of Physics, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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YUAN Guang-Hui, WANG Pei, ZHANG Dou-Guo et al 2007 Chin. Phys. Lett. 24 1600-1602 |
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Abstract Based on the rigorous coupled-wave analysis algorithm, we have systematically analysed the effect of the geometrical parameters of a dielectric film coated metallic grating with subwavelength slits on extraordinary optical transmission for s-polarization illumination. Results show that the dielectric film which sustains a waveguide electromagnetic mode on the top of the metallic lamellar grating can strongly enhance the transmittance, the positions of the transmission peaks are mainly determined by the period of the metallic grating, the thickness and refractive index of the dielectric film. This structure shows potential applications in excellent polarizers or polarization-isotropic devices at infrared spectral range by
appropriately choosing the geometrical parameters.
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| Keywords:
42.79.Dj
78.66.Bz
73.20.Mf
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Received: 12 March 2007
Published: 17 May 2007
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| PACS: |
42.79.Dj
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(Gratings)
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78.66.Bz
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(Metals and metallic alloys)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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