Resonant Transmission Through a Single Subwavelength Slit for Varied Metallic Permittivities and Its Modal Orthogonality

This article investigates resonant transmission phenomena through a single metallic subwavelength slit when the permittivity of a real metal varies. The single metallic slit is utilized as a metal–insulator–metal waveguide, and a mode-matching technique is employed to obtain the transmitted power. T...

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Bibliographic Details
Published in:Applied sciences 2020-01, Vol.10 (2), p.660
Main Authors: Park, Jong-Eon, Choo, Hosung, Cho, Young-Ki
Format: Article
Language:English
Subjects:
Complex permittivity
Eigenvalues
Electromagnetism
Finite element analysis
Geometry
Metal plates
Metals
metal–insulator–metal waveguide
mode-matching technique
Orthogonality
Permittivity
Thickness
transmission cross-section
Waveguides
Wavelengths
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Summary:This article investigates resonant transmission phenomena through a single metallic subwavelength slit when the permittivity of a real metal varies. The single metallic slit is utilized as a metal–insulator–metal waveguide, and a mode-matching technique is employed to obtain the transmitted power. The periodic resonant transmission phenomena (in terms of the metallic plate thickness) are solved, and the resonances can be understood by their guide wavelengths. Even when the permittivity of the real metal includes imaginary parts (i.e., metal with loss), the resonant transmittances are obtained. However, the peaks of the transmittances decrease, as the plate thickness increases. The orthogonal relationship of an incomplete orthogonal set is maintained despite metallic loss (given a relatively small amount of loss), due to the complex permittivity of the real metal.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10020660