Coupling of plasmonic nanopore pairs: facing dipoles attract each other

Light, Science & Applications
Takumi SannomiyaNaoki Yamamoto

Abstract

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-...Continue Reading

References

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Citations

Jul 7, 2018·Beilstein Journal of Nanotechnology·Kalpana SinghAnn Roberts
Mar 7, 2019·Light, Science & Applications·Matan GalantyAdi Salomon
Jan 17, 2020·The Journal of Chemical Physics·Hiroki OhnishiTakumi Sannomiya
Mar 10, 2019·Scientific Reports·M HorákT Šikola
Jun 5, 2020·Nature·Kangpeng WangIdo Kaminer
Feb 24, 2020·The Journal of Chemical Physics·Dung Vu ThiTakumi Sannomiya
Aug 28, 2020·ACS Nano·Taeko MatsukataTakumi Sannomiya

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