Role of localised surface plasmon polaritons coupling in optical transmission through double-layer metal apertures

doi:10.1088/1674-1056/19/6/067303

摘要/Abstract

摘要： In this paper, we investigate the optical properties of the double-layer metal films perforated with single apertures by analysing the coupling of localized surface plasmon polaritons (LSPPs). It is found that the amplitude and the wavelength of transmission peak in such a structure can be adjusted by changing the longitudinal interval D between two films and the lateral displacements d_{x} and d_{y} which are parallel and perpendicular to the polarization direction of incident light, respectively. The variation of longitudinal interval D results in the redshift of transmission peak due to the change of coupling strength of LSPPs near the single apertures. The amplitude of transmission peak decreases with the increase of d_{y} and is less than that in the case of d_{x}, which originates from the difference in coupling manner between LSPPs and the localized natures of LSPPs.

Abstract: In this paper, we investigate the optical properties of the double-layer metal films perforated with single apertures by analysing the coupling of localized surface plasmon polaritons (LSPPs). It is found that the amplitude and the wavelength of transmission peak in such a structure can be adjusted by changing the longitudinal interval D between two films and the lateral displacements $d_{x}$ and $d_{y}$ which are parallel and perpendicular to the polarization direction of incident light, respectively. The variation of longitudinal interval D results in the redshift of transmission peak due to the change of coupling strength of LSPPs near the single apertures. The amplitude of transmission peak decreases with the increase of $d_{y}$ and is less than that in the case of $d_{x}$, which originates from the difference in coupling manner between LSPPs and the localized natures of LSPPs.

Key words: enhanced transmission, localized surface plasmon polaritons, double-layer metal apertures

中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

73.20.Mf

71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions)) 78.66.Bz (Metals and metallic alloys) 73.21.Ac (Multilayers)

龚志强, 刘坚强. Role of localised surface plasmon polaritons coupling in optical transmission through double-layer metal apertures[J]. 中国物理B, 2010, 19(6): 67303-067303.

Gong Zhi-Qiang(龚志强) and Liu Jian-Qiang(刘坚强). Role of localised surface plasmon polaritons coupling in optical transmission through double-layer metal apertures[J]. Chin. Phys. B, 2010, 19(6): 67303-067303.

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