CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Plasmonic interactions between a perforated gold film and a thin gold film |
Zhou Xin(周昕)a)b), Li Hong-Jian(李宏建)a)b)†, Xie Su-Xia(谢素霞)a)b), Fu Shao-Li(付少丽)a),Xu Hai-Qing(徐海清)a), and Wu Jin-Jun(吴金军)a) |
a College of Physics Science and Technology, Central South University, Changsha 410083, China; b College of Materials Science and Engineering, Central South University, Changsha 410083, China |
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Abstract Based on the finite difference time domain method, we investigated theoretically the optical properties and the plasmonic interactions between a gold film perforated with periodic sub-wavelength holes and a thin gold film. We showed that the plasmon resonant energies and intensities depend strongly on the thicknesses of the two films and the lattice constant. Based on the distributions of normal electric field component Ez, tangential electric field component Ey and total energy, we showed that the optical transmission is due to the collaboration of the localized waveguide resonance, the surface plasmon resonance and the coupling of the flat-surface plasmon of the two layers.
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Received: 31 January 2010
Revised: 05 April 2010
Accepted manuscript online:
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PACS:
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68.55.-a
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(Thin film structure and morphology)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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78.66.Bz
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(Metals and metallic alloys)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60708014), the Science Foundation for Post-doctorate of China (Grant No. 2004035083), the Natural Science Foundation of Hunan Province of China (Grant No. 06JJ2034), the Excellent Doctorate Dissertation Foundation of Central South University (Grant No. 2008yb039) and the Hunan Provincial Innovation Foundation for Postgraduate (Grant No. CX2009B029). |
Cite this article:
Zhou Xin(周昕), Li Hong-Jian(李宏建), Xie Su-Xia(谢素霞), Fu Shao-Li(付少丽),Xu Hai-Qing(徐海清), and Wu Jin-Jun(吴金军) Plasmonic interactions between a perforated gold film and a thin gold film 2010 Chin. Phys. B 19 127806
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