Enhanced transmission of microwave radiation in one-dimensional metallic gratings with subwavelength aperture
Date
2004Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
American Institute of Physics
Volume
85
Issue
7
Pages
1098 - 1100
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
Metallic gratingsMetallic 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