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      Plasmonic nanoparticles by laser dewetting of thin metallic films

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      Author(s)
      Sarıtaş, Seval
      Advisor
      Aydınlı, Atilla
      Date
      2013
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      In this work, formation of metal nanoparticles via laser induced dewetting and their plasmonic properties have been investigated. The effects of metal film, substrate type, laser power density and dwell time on dewetting phenomenon were analyzed. Silver and gold thin films were fabricated with thermal evaporation on various substrates. Next, they were characterized by the ellipsometry, UV-VIS spectroscopy and atomic force microscopy (AFM) as the characteristic of the thin film affects dewetting. Samples were then processed by a cw argon laser. Varying the dwell time and power density, Ag and Au nanoparticles with different morphology were obtained. At the final stages of dewetting, nanoparticles attained spherical shapes. Particle size distribution and length scale analysis were performed using the images obtained from scanning electron microscope (SEM). Using these results, relations between the average particle size and film thickness, as well as the relation between length scale and film thickness were obtained to verify the occurrence of dewetting. Substrate and film type were observed to affect the particle morphology and particle size. Moreover, plasmonic resonance effect of Ag and Au nanoparticles were observed via the optical absorbance measurements. Multilayered metallic nanoparticles and embedded nanoparticles were fabricated and were found to display plasmonic properties.
      Keywords
      Laser induced dewetting
      thin film
      plasmonics
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      http://hdl.handle.net/11693/16919
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      • Dept. of Physics - Master's degree 170
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