Optical properties of thin metal films with nanohole arrays on porous alumina-aluminum structures

A multilayer system is formed by the deposition of a 10-35 nm thin Au or Ag film with 18-25 nm diameter holes on 75-280 nm thick layers of porous anodized aluminum oxide (AAO) supported by a bulk sheet of aluminum. We present a detailed study of system parameters, which influence the optical respons...

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Bibliographic Details
Published in:RSC advances 2015-01, Vol.5 (83), p.68143-6815
Main Authors: Prikulis, Juris, Tamulevi ius, Tomas, Poplausks, Raimonds, Bergs, Gatis, Apsite, Indra, Malinovskis, Uldis, Actins, Andris, Erts, Donats
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
Aluminum oxide
Anodizing
Arrays
Metal films
Nanostructure
Silver
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Summary:A multilayer system is formed by the deposition of a 10-35 nm thin Au or Ag film with 18-25 nm diameter holes on 75-280 nm thick layers of porous anodized aluminum oxide (AAO) supported by a bulk sheet of aluminum. We present a detailed study of system parameters, which influence the optical response, including the porosity, metal layer thickness and crystallographic orientation of the Al substrate. The spectral properties are mainly governed by the interference of the reflections from the Al substrate and the thin metal film separated by the AAO layer. An enhanced plasmonic attenuation component near 650 nm for the Au films with holes can be observed when the interferometric anti-reflection condition is fulfilled close to this particular wavelength. Enhanced plasmonic attenuation of reflection is observed in a gold-alumina-aluminum multilayer system near the interferometric anti-reflection condition.
ISSN:2046-2069
2046-2069
DOI:10.1039/c5ra12880c