Optical guided dispersions and subwavelength transmissions in dispersive plasmonic circular holes |
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| Authors: | K Y Kim Y K Cho H S Tae J H Lee |
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| Institution: | (1) School of Electrical Engineering and Computer Science, Kyungpook National University, 702-701 Daegu, Korea;(2) Department of Radio Science and Communication Engineering, Hongik University, 121-791 Seoul, Korea |
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| Abstract: | The light transmission through a dispersive plasmonic circular hole is numerically investigated with an emphasis on its subwavelength
guidance. For a better understanding of the effect of the hole diameter on the guided dispersion characteristics, the guided
modes, including both the surface plasmon polariton mode and the circular waveguide mode, are studied for several hole diameters,
especially when the metal cladding has a plasmonic frequency dependency. A brief comparison is also made with the guided dispersion
characteristics of a dispersive plasmonic gap K.Y. Kim, et al., Opt. Express 14, 320–330 (2006)], which is a planar version
of the present structure, and a circular waveguide with perfect electric conductor cladding. Finally, the modal behaviour
of the first three TM-like principal modes with varied hole diameters is examined for the same operating mode. |
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| Keywords: | dispersion dispersive plasmonic hole subwavelength guidance surface plasmon polariton surface wave |
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