Temperature-Dependent Morphology Evolution and Surface Plasmon Absorption of Ultrathin Gold Island Films

Ultrathin gold island films on transparent substrates display a characteristic surface plasmon (SP) absorption band in which the peak position and full width at half-maximum (fwhm) are highly sensitive to the film morphology. In the present study, we investigated the temperature dependence of morphological evolution and the corresponding unique surface plasmon resonance (SPR) properties variation of the ultrathin gold island films (5 nm nominal thickness) upon rapid thermal annealing for 180 s at different temperatures ranging from 100 to 700 °C. The morphological evolution of the ultrathin gold film upon the thermal annealing-induced dewetting was studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM), and the optical properties variation was characterized by a transmission UV–vis-NIR spectroscopy. A strong temperature dependence of morphological evolution and optical properties variation as a function of thermal treatment conditions was identified. The blue shift and band nar...

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