Surface-Plasmon Assisted Transmission Through an Ultrasmall Nanohole of ~ 10 nm with a Bull's Eye Groove
Geon Woo Kim1, Jae-Hyeon Ko1, Doo Jae Park1, Seong Soo Choi2, Hyuntae Kim3, Soo Bong Choi3
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
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.
J. Korean Phy. Soc. 2018; 73: 1698-1702  https://doi.org/10.3938/jkps.73.1698
Quantum Entanglement of Dark Matter
Jae-Weon Lee
Department of Renewable Rnergy, Jungwon University, Goesan 13557, Korea
Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
We suggest that dark matter in galactic halos has quantum entanglement, if dark matter is a Bose-Einstein condensation of ultra-light scalar particles (i.e., Fuzzy dark matter). In this model, any two regions of a galaxy are quantum entangled due to the quantum nature of the condensate. We calculate the entanglement entropy SE of a typical galactic halo, which turns out to be at least O(ln(M/m)), where M is the mass of the halo and m is the mass of a dark matter particle. The entanglement can be inferred from the rotation curves of the galaxy.
J. Korean Phy. Soc. 2018; 73: 1596-1602  https://doi.org/10.3938/jkps.73.1596
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