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- W2068076164 abstract "While the optical properties of thin metal films are well understood in the visible and near-infrared range, little has been done in the midinfrared and far-infrared region. Here we investigate ultrathin gold films prepared on $text{Si}(111)(7ifmmodetimeselsetexttimesfi{}7)$ in UHV by measuring in the frequency range between 500 and $7000text{ }{text{cm}}^{ensuremath{-}1}$ and for temperatures between 300 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 nonmetallic 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 $1100text{ }{text{cm}}^{ensuremath{-}1}$." @default.
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- W2068076164 date "2008-11-07" @default.
- W2068076164 modified "2023-09-27" @default.
- W2068076164 title "Temperature- and frequency-dependent optical properties of ultrathin Au films" @default.
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- W2068076164 doi "https://doi.org/10.1103/physrevb.78.205409" @default.
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