Homogenized Lorentz-Drude optical response in highly nanoporous conducting gold layers produced by de-alloying

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dc.contributor.author Smith, GB
dc.contributor.author Maaroof, AI
dc.contributor.author Gentle, A
dc.date.accessioned 2009-06-26T04:10:33Z
dc.date.issued 2007-03-01
dc.identifier.citation Optics Communications, 2007, 271 (1), pp. 263 - 268
dc.identifier.citation Optics Communications, 2007, 271 (1), pp. 263 - 268
dc.identifier.issn 0030-4018
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/465
dc.description.abstract Nanoporous gold films produced by de-alloying AuAl2 with void densities between 45% and 65% retain high infra-red reflectance and good conductivity. They act optically like a homogeneous Lorentz-Drude metal with a unique plasma frequency ωp* and an inter-band transition energy unchanged from that of dense gold. The link between ωp* and ωp in dense gold is found using a simplification of the Bergman expansion for permittivity valid at infra-red wavelengths. The carrier relaxation time of the "effective metal" becomes the actual relaxation time in the Au network and the complex refractive indices (n, k) found using normal incidence spectrophotometry and oblique incidence ellipsometry agree closely with each other. The single pole approximation for the ratio ωp* / ωp in the infra-red allows estimates of void content and the apparent shift in carrier effective mass. It is then possible to model with no adjustable parameters, the full UV-visible-NIR spectral response, giving excellent agreement with data. A range of films with these properties are presented. © 2006 Elsevier B.V. All rights reserved.
dc.description.abstract Nanoporous gold films produced by de-alloying AuAl2 with void densities between 45% and 65% retain high infra-red reflectance and good conductivity. They act optically like a homogeneous Lorentz-Drude metal with a unique plasma frequency ωp* and an inter-band transition energy unchanged from that of dense gold. The link between ωp* and ωp in dense gold is found using a simplification of the Bergman expansion for permittivity valid at infra-red wavelengths. The carrier relaxation time of the "effective metal" becomes the actual relaxation time in the Au network and the complex refractive indices (n, k) found using normal incidence spectrophotometry and oblique incidence ellipsometry agree closely with each other. The single pole approximation for the ratio ωp* / ωp in the infra-red allows estimates of void content and the apparent shift in carrier effective mass. It is then possible to model with no adjustable parameters, the full UV-visible-NIR spectral response, giving excellent agreement with data. A range of films with these properties are presented. © 2006 Elsevier B.V. All rights reserved.
dc.language eng
dc.language eng
dc.relation.isbasedon 10.1016/j.optcom.2006.10.038
dc.title Homogenized Lorentz-Drude optical response in highly nanoporous conducting gold layers produced by de-alloying
dc.type Journal Article
dc.description.version Published
dc.parent Optics Communications
dc.parent Optics Communications
dc.journal.volume 1
dc.journal.volume 271
dc.journal.number 1 en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 263 en_US
dc.identifier.endpage 268 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0205 Optical Physics
dc.personcode 730312
dc.personcode 000307
dc.personcode 010727
dc.percentage 100 en_US
dc.classification.name Optical Physics en_US
dc.classification.type FOR-08 en_US
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - Materials and Technology for Energy Efficiency
pubs.organisational-group /University of Technology Sydney/Strength - Materials and Technology for Energy Efficiency
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history School of Physics and Advanced Materials (ID: 343)
utslib.collection.history General Collection (ID: 346) [2015-05-15T14:11:07+10:00]
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of Physics and Advanced Materials (ID: 343)
utslib.collection.history School of Physics and Advanced Materials (ID: 343)


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