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Open AccessArticle

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

1
Metamaterial Electronic Device Research Center, Hongik University, Seoul 04066, Korea
2
School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea
3
School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 660; https://doi.org/10.3390/app10020660
Received: 5 December 2019 / Revised: 13 January 2020 / Accepted: 14 January 2020 / Published: 16 January 2020
(This article belongs to the Section Electrical, Electronics and Communications Engineering)
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. View Full-Text
Keywords: transmission cross-section; metal–insulator–metal waveguide; mode-matching technique transmission cross-section; metal–insulator–metal waveguide; mode-matching technique
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MDPI and ACS Style

Park, J.-E.; Choo, H.; Cho, Y.-K. Resonant Transmission Through a Single Subwavelength Slit for Varied Metallic Permittivities and Its Modal Orthogonality. Appl. Sci. 2020, 10, 660.

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