Summary
International Symposium on Antennas and Propagation
2009
Session Number:3B4
Session:
Number:3B4-1
Physics in Resonant Transmission on the Small Aperture Coupling
Jong-Eon Park, Jong-Ig Lee, Ji-Whan Ko, Young-Ki Cho,
pp.887-890
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Light (or Electromagnetic energy) transmission through a small aperture was first studied by Bethe in 1944. Bethe’s theory tells us that the transmitted power through the small hole is very low and the transmission efficiency is very poor, in more detail, the transmittance normalized to the area scales as (a/λ) 4 where a is the hole (small aperture) radius and λ is the wavelength. Recently observations of extraordinary optical transmission (EOT) through a single small hole (or aperture) or through arrays of subwavelength holes in metal films have spurred on intense research activities into understanding and utilizing this phenomenon. The main findings of those recent works are that elliptical or rectangular holes can dramatically influence on the intensity of the transmission. Later, the origin of the transmission resonance was explained with a theory that incorporated the coupling between the modes inside the hole with the free-space regions on either side of the film. The physical nature of this effect was attributed to a Fabry-Perot like resonance due to multiple reflections of the mode within the hole at the interfaces with the free-space regions. Also, in the area of near-field optical applications such as optical data storage, nanolithography, and nano-microscopy, the high-transmission mechanism of the C-shaped aperture was investigated by testing the aperture transmission response for various values of the ridge geometries of the C-aperture [1]. Though the two transmission resonance structures ? the Fabry-Perot like resonance structure and the C-shaped aperture structure ? seem to be quite different, they share common features from the viewpoint of the transmission resonance phenomena which has not been recognized fully. Hence, we are going to discuss the common features between the two structures with main interest centering on the transmission resonance phenomena.