
1.Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8503, Japan
2.Center of Advanced Instrumental Analysis, Kyushu University, Kasuga 816-8580, Japan
3.Department of Physics, Chalmers University of Technology, Gothenburg 41296, Sweden
T Sannomiya, Email: sannomiya.t.aa@m.titech.ac.jp
Published:2016-09,
Published Online:07 April 2016,
Received:28 September 2015,
Revised:07 March 2016,
Accepted:05 April 2016
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Sannomiya, T. et al. Coupling of plasmonic nanopore pairs: facing dipoles attract each other. Light: Science & Applications, 5, e16146 (2016).
Sannomiya, T. et al. Coupling of plasmonic nanopore pairs: facing dipoles attract each other. Light: Science & Applications, 5, e16146 (2016). DOI: 10.1038/lsa.2016.146.
Control of the optical properties of nano-plasmonic structures is essential for next-generation optical circuits and high-throughput biosensing platforms. Realization of such nano-optical devices requires optical couplings of various nanostructured elements and field confinement at the nanoscale. In particular
symmetric coupling modes
also referred to as dark modes
have recently received considerable attention because these modes can confine light energy to small spaces. Although the coupling behavior of plasmonic nanoparticles has been relatively well studied
couplings of inverse structures
that is
holes and pores
remain partially unexplored. Even for the most fundamental coupling system of two dipolar holes
comparison of the symmetric and anti-symmetric coupling modes has not been performed. Here we present
for the first time
a systematic study of the symmetric and anti-symmetric coupling of nanopore pairs using cathodoluminescence by scanning transmission electron microscopy and electromagnetic simulation. The symmetric coupling mode
approximated as a pair of facing dipoles
is observed at a lower energy than that of the anti-symmetric coupling mode
indicating that the facing dipoles attract each other. The anti-symmetric coupling mode splits into the inner- and outer-edge localized modes as the coupling distance decreases. These coupling behaviors cannot be fully explained as inverses of coupled disks. Symmetric and anti-symmetric coupling modes are also observed in a short-range ordered pore array
where one pore supports multiple local resonance modes
depending on the distance to the neighboring pore. Accessibility to the observed symmetric modes by far field is also discussed
which is important for nanophotonic device applications.
cathodoluminescenceplasmonic nanoporeshort-range ordersurface plasmontransmission electron microscopy
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