Optical anisotropy of organized silver nanoparticles in 2D superlattice

✍ Scribed by A Taleb; V Russier; A Courty; M.P Pileni

• Book ID: 104309233
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 560 KB
• Volume: 162-163
• Category: Article
• ISSN: 0169-4332
• DOI: 10.1016/s0169-4332(00)00269-5

✦ Synopsis

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We compare the optical properties of spherical particles organized in a two-dimensional 2D structure with disordered and coalesced particles. Both particle preparations were deposited on cleaved graphite substrates. When particles are arranged in a hexagonal array, the optical measurements under p-polarization show a new high-energy resonance which is interpreted as a collective effect, resulting from optical anisotropy due to the mutual interactions between particles. We support this interpretation by numerical calculations performed for finite-size clusters of silver spheres. For disordered and coalesced particles, a low-energy resonance appears instead of the high-energy resonance observed for spherical and organized particles. This is interpreted as optical shape anisotropy due to the asymmetrical shape of coalesced particles.