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Formation and Plasmonic Response of Self-Assembled Layers of Colloidal Gold Nanorods and Branched Gold Nanoparticles
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posted on 2012-06-19, 00:00 authored by K. Marvin Schulz, Sabine Abb, Rute Fernandes, Martina Abb, Antonios G. Kanaras, Otto L. MuskensThe plasmonic properties of self-assembled layers of
rod- and branched-shaped
gold nanoparticles were investigated using optical techniques. Nanoparticles
were synthesized by a surfactant-guided, seed-mediated growth method.
The layers were obtained by gradual assembly of nanoparticles at the
interface between a polar and a nonpolar solvent and were transferred
to a glass slide. Polarization and angle-dependent extinction measurements
showed that the layers made of gold nanorods were governed by an effective
medium response. The response of the layers made by branched gold
particles was characterized by random light scattering. Microscopic
mapping of the spatial mode structure demonstrates a uniform optical
response of the nanoparticle layers down to a submicrometer length
scale.