Surface-Plasmon Assisted Transmission Through an Ultrasmall Nanohole of ~ 10 nm with a Bull's Eye Groove
J. Korean Phy. Soc. 2018; 73: 1698~1702
Published online December 14, 2018 © 2018 The Korean Physical Society.

1Department of Physics, Hallym University, Chuncheon 24252, Korea
2Research Center for Nanobio Science, Sun Moon University, Ahsan 31460, Korea
3Department of Physics, Incheon National University, Incheon 22012, Korea
Correspondence to: Doo Jae Park
We simulate the light transmission through an extremely small nanoscale aperture having a 10 nm diameter punctured in a metal film positioned at the center of a plasmonic bull’s eye grating. A considerable directive emission of transmitted light with a divergence angle of 5.7 degrees was observed at 10 μm from the nanohole opening at the frequency of surface plasmon polariton excitation, an confirmed by measuring the distance dependent transmission amplitude. It is found that near-field enhancement associated with the surface plasmon excitation, and the interference of the electric field light through the nanohole in the near-field region is responsible for such a considerable directive emission.
PACS numbers: 73.20.Mf, 78.67.-n, 42.25.Fx
Keywords: Plasmons on surface and interface, Optical properties of nanostructures, Optical diffraction

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