Shape effects in the localized surface plasmon resonance of single nanoholes in thin metal films

被引：63

作者：

Sepulveda, B. ^{[1
,3
]}

Alaverdyan, Y. ^{[2
,3
]}

Alegret, J. ^{[2
]}

Kall, M. ^{[2
]}

Johansson, P. ^{[4
]}

机构：

[1] CSIC, ICN, Res Ctr Nanosci & Nanotechnol, E-08193 Barcelona, Spain

[2] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[4] Univ Orebro, Dept Nat Sci, SE-70182 Orebro, Sweden

来源：

OPTICS EXPRESS | 2008年 / 16卷 / 08期

关键词：

D O I：

10.1364/OE.16.005609

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the polarization-dependent optical response of elongated nanoholes in optically thin gold films. We measured elastic scattering spectra of spatially isolated ellipsoidal nanoholes with varying aspect ratio and compared the results to electrodynamic simulations. Both experiments and theory show that the plasmon mode that is polarized parallel to the short axis of the ellipsoidal hole red-shifts with increasing aspect ratio. This behavior is completely opposite to the case of elongated metal particles. We present a simple analytical model that qualitatively explains the observations in terms of the different orientations of the induced dipole moments in holes and particles. (C) 2008 Optical Society of America.

引用

页码：5609 / 5616

页数：8

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