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Shape effects in the localized surface plasmon resonance of single nanoholes in thin metal films
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2008 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 16, no 8, p. 5609-5616Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Washington, DC: Optical Society of America , 2008. Vol. 16, no 8, p. 5609-5616
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Natural Sciences Physical Sciences Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-3812DOI: 10.1364/OE.16.005609OAI: oai:DiVA.org:oru-3812DiVA, id: diva2:138110
Available from: 2009-01-09 Created: 2009-01-09 Last updated: 2017-12-14Bibliographically approved

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Publisher's full texthttp://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-8-5609

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Johansson, Peter

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