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http://dx.doi.org/10.5515/KJKIEES.2014.25.11.1113

General Theory for Enhancing the Transmission Efficiency through Small Apertures  

Cho, Young-Ki (School of Electronics Engineering, Kyungpook National University)
Publication Information
Abstract
In this paper, general methods for enhancing the transmission efficiency through the small subwavelength aperture in an infinite conducting plane are considered first by use of the transmission-resonant aperture like the ridged circular aperture structure, second by employing the transmission-resonant cavity structure. In particular, the maximum transmission cross section is found to be $\frac{2G{\lambda}^2}{4{\pi}}[m^2]$ for the two structures, where G is the gain of the aperture in the output half space. As experimental works, the impedance matching characteristics are investigated for the cases that above two structures are incorporated as a potential near field microscopic probe in the waveguide end. As a complementary problem to the above transmission-resonant aperture problem, some discussions are also given on the scattering resonance by the scattering object much smaller than the wavelength. This discussion may provide a good understanding of the physics for the phenomena that the maximum scattering cross section is much larger than the physical size of the atom in atomic physics area.
Keywords
Subwavelength Aperture; Ridged Circular Aperture Structure; Transmission Cavity Structure; Transmission Cross Section; Scattering Resonance;
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Times Cited By KSCI : 3  (Citation Analysis)
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