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

Smith, GB; Maaroof, AI; Gentle, A

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

Smith, GB

Maaroof, AI Gentle, A

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Publication Type:: Journal Article
Citation:: Optics Communications, 2007, 271 (1), pp. 263 - 268
Issue Date:: 2007-03-01

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Field	Value	Language
dc.contributor.author	Smith, GB https://orcid.org/0000-0002-6985-2880	en_US
dc.contributor.author	Maaroof, AI	en_US
dc.contributor.author	Gentle, A https://orcid.org/0000-0001-8964-0722	en_US
dc.date.issued	2007-03-01	en_US
dc.identifier.citation	Optics Communications, 2007, 271 (1), pp. 263 - 268	en_US
dc.identifier.issn	0030-4018	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.	en_US
dc.relation.ispartof	Optics Communications	en_US
dc.relation.isbasedon	10.1016/j.optcom.2006.10.038	en_US
dc.subject.classification	Optoelectronics & Photonics	en_US
dc.title	Homogenized Lorentz-Drude optical response in highly nanoporous conducting gold layers produced by de-alloying	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	271	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	1005 Communications Technologies	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	271	en_US

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.

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http://hdl.handle.net/10453/465