Temperature and frequency dependent optical properties of ultra-thin Au films

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dc.creatorBrandt, Tobby
dc.creatorHövel, Martin
dc.creatorGompf, Bruno
dc.creatorDressel, Martin
dc.date2008-08-20
dc.date2008-10-16
dc.date.accessioned2026-07-07T10:16:45Z
dc.date.available2026-07-07T10:16:45Z
dc.descriptionWhile the optical properties of thin metal films are well understood in the visible and near-infrared range, little has been done in the mid- and far-infrared region. Here we investigate ultra-thin gold films prepared on Si(111)(7 x 7) in UHV by measuring in the frequency range between 500 cm-1 and 7000 cm-1 and for temperatures between 300 K and 5 K. The nominal thickness of the gold layers ranges between one monolayer and 9 nm. The frequency and temperature dependences of the thicker films can be well described by the Drude model of a metal, when taking into account classical size effects due to surface scattering. The films below the percolation threshold exhibit a non-metallic behavior: the reflection increases with frequency and decreases with temperature. The frequency dependence can partly be described by a generalized Drude model. The temperature dependence does not follow a simple activation process. For monolayers we observe a transition between surface states around 1100 cm-1.
dc.description7 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/0808.2739
dc.identifierhttp://arxiv.org/abs/0808.2739
dc.identifierPhys. Rev. B 78, 205409 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.205409
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/173619
dc.subjectMaterials Science
dc.titleTemperature and frequency dependent optical properties of ultra-thin Au films
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