Enhanced transmission of microwave radiation in one-dimensional metallic gratings with subwavelength aperture

Date
2004
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Source Title
Applied Physics Letters
Print ISSN
0003-6951
Electronic ISSN
Publisher
American Institute of Physics
Volume
85
Issue
7
Pages
1098 - 1100
Language
English
Type
Article
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Abstract

We report a theoretical and experimental demonstration of enhanced microwave transmission through subwavelength apertures in metallic structures with double-sided gratings. Three different types of aluminum gratings (sinusoidal, symmetric rectangular, and asymmetric rectangular shaped) are designed and analyzed. Our samples have a periodicity of 16 mm, and a slit width of 2 mm. Transmission measurements are taken in the 10–37.5 GHz frequency spectrum, which corresponds to 8–30 mm wavelength region. All three structures display significantly enhanced transmission around surface plasmon resonance frequencies. The experimental results agree well with finite-difference-time-domain based theoretical simulations. Asymmetric rectangular grating structure exhibits the best results with ,50% transmission at 20.7 mm, enhancement factor of ,25, and ±4° angular divergence.

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Keywords
Metallic gratings, Metallic structures, Subwavelength apertures, Wave vectors, Aluminum, Computer simulation, Electric fields, Electric network analyzers, Electromagnetic wave transmission, Electromagnetic waves, Finite difference method, Natural frequencies, Photons, Resonance, Surface plasmon resonance, Time domain analysis, Microwaves
Citation
Published Version (Please cite this version)