Nanoantenna-Assisted Extraordinary Optical Transmission Under Radial Polarization Illumination |
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Authors: | Guanghao Rui Qiwen Zhan Hai Ming |
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Institution: | (1) Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China;(2) Electro-Optics Program, University of Dayton, 300 College Park, Dayton, OH 45469-0245, USA; |
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Abstract: | We numerically study the extraordinary optical transmission of a plasmonic structure that combines a circular nanoantenna
and a vertical annular nanoslit etched into a gold film under radially polarized illumination. The nanoantenna collects the
incident field and localizes it in a horizontal Fabry-Pérot cavity over the gold film. The vertical nanoslit positioned at
the maximal field in the horizontal cavity couples the localized field and facilitates its transmission to the free space.
Due to the symmetry matching between the structure and the illumination polarization, surface plasmons can be excited effectively
and enhance the transmission. Through optimizing the structure parameters, the transmission efficiency can be greatly enhanced
by 225 times for a resonant annular nanoslit and 251 times for a non-resonant annular nanoslit. This axisymmetric extraordinary
optical transmission setup may be fabricated on the facet of an optical fiber for optical sensing applications. |
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