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- W2056587251 abstract "The optical properties of a metal film perforated with periodic circular-hole dimers have been studied and the role of plasmon coupling between the dimer holes has been analyzed. For light polarization perpendicular to the dimer axis, the resonance is sensitive to the hole distance, especially when the dimer holes are nearly touching. Depending on whether the holes are touching or not, two coupling regimes have been explored, where different coupling mechanisms and behaviors are involved. In the separation-coupling regime, the coupling of dimer holes is mainly mediated by the surrounding current or magnetic dipoles. Accordingly, the coupling mode blue-shifts with an increase of hole separation. In the touching-coupling regime, instead, the coupling is mainly governed by two apexes, which carry opposite surface charges and behave as electric dipoles. With the increase of hole distance or approaching of two apexes, the mode shifts drastically to the longer wavelength. The hole touching can also set a cutoff for the current near the apexes, thus, producing a strong circulating current (or magnetic field) around (or inside) the dimer holes. Such a strong magnetic field is not present for single circular holes. In addition, for light polarization parallel to the dimer axis, no obvious shifts of the plasmon mode can be observed. The structure may be employed to boost light-matter interactions via the enhanced electric or magnetic fields and filter light with the desired wavelength or polarization." @default.
- W2056587251 created "2016-06-24" @default.
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- W2056587251 date "2012-07-01" @default.
- W2056587251 modified "2023-10-02" @default.
- W2056587251 title "Plasmon coupling in circular-hole dimers: From separation- to touching-coupling regimes" @default.
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- W2056587251 doi "https://doi.org/10.1063/1.4736560" @default.
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