Evolution of optical properties of Au thin films with thermal annealing

izvorni znanstveni rad

izvorni znanstveni rad

Evolution of optical properties of Au thin films with thermal annealing

Elizabeth Hedl
Vrsta prilog u časopisu
Tip izvorni znanstveni rad
Godina 2024
Časopis Optical materials
Volumen 150
Stranice 115129, 7
DOI 10.1016/j.optmat.2024.115129
ISSN 0925-3467
EISSN 1873-1252
Status objavljeno

Sažetak

Gold (Au) thin films exhibit varied optical properties, ranging from metal-like behavior in percolated films
to localized surface plasmons in island thin films. Additionally, thermal annealing introduces variability in
particle sizes and shapes leading to optical response modification and enhancing the suitability of the film for
possible sensing applications. This study investigates the evolution of optical properties in thermally annealed
gold films, with a focus on the interplay between the amount of deposited material and annealing conditions. It
aims to determine the range of temperatures at which annealing induces the most significant changes in optical
properties and identifies the spectral ranges where these changes occur. Analysis of the complex effective
dielectric function of the films helps to understand whether the film behaves like metal or like an insulator.
The study focuses on three different film regimes according to the morphology as determined by the deposited
mass thickness: islands films (5 nm), nearly-percolated (15 nm), and compact (25 nm). Each characteristic
morphology displays distinct evolution upon thermal annealing, with different temperature ranges in which
the changes are most remarkable. Overall, these findings provide valuable insights into the optical properties of
gold thin films and their response to thermal annealing, showing the way for their enhanced usage in sensing
purposes.

Ključne riječi

Au thin films; optical properties; annealed thin films; percolation threshold; effective dielectric function

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