Plasmon spectroscopy of anisotropic gold nanoclusters on GaAs(001) surface passivated by sulphur atoms
Berkovits V. L.1, Kosobukin V. A.1, Ulin V. P.1, Alekseev P. A.1, Soldatenkov F. Yu.1, Levitskii V.A.2
1Ioffe Institute, St. Petersburg, Russia
2D Center TFTE, St. Petersburg, Russia
Email: vladimir.berkovits@mail.ioffe.ru

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This work demonstrates how to create the structures Au/GaAs with perfect on-surface gold nanoclusters. In doing so, used is covering the GaAs substrate with chemically stable atomic monolayers of sulphur to prevent subsequently a chemical reaction of Au with GaAs. The structures Au/S/GaAs with monolayers of chemisorbed sulphur atoms are fabricated, characterized and studied by polarized reflection spectroscopy. The anisotropy of on-surface gold nanoclusters is established, and the anisotropic plasmons localized in Au clusters are investigated using the spectra of polarized reflection and interpreted theoretically. Keywords: sulphide passivation, gold nanoclusters, plasmon anisotropy, polarized reflectance.
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