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28 January 2008 Optics of triangular Mie particles in ultrathin Ag films
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Abstract
Ultrathin Ag films (2-10 nm thick) were fabricated on clean glass microslides by thermal evaporation. XRD shows them to be X-ray amorphous implying absence of long range order. AFM pictures show the presence of 2D triangular nanoplatelets arranged in a random manner, the sizes of the platelets grow with increasing film thickness Optical absorption spectra in the UV-visible give evidence for the presence of Mie particles through surface plasmon resonance whose peak positions and intensities depend sensitively upon thickness of Ag films. Surface plasmon resonance(SPR) features occur with maxima at 440, 457 and 484nm for the films of thickness 2, 5 and 10nm respectively with 5nm films showing properties characteristic of a optimally matched dielectric and electronic properties of the substrate and sample respectively.
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M. Gnanavel and C. S. Sunandana "Optics of triangular Mie particles in ultrathin Ag films", Proc. SPIE 6901, Photonic Crystal Materials and Devices VII, 69011E (28 January 2008); https://doi.org/10.1117/12.762073
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