Plasmonic nanoparticles for a bottom-up approach to fabricate optical metamaterials

We investigate experimentally metallic nanoparticle composites fabricated by bottom-up techniques as potential candidates for optical metamaterials. Depending on the plasmonic resonances sustained by individual NPs and their nanoscale organization into larger meta-atoms, various properties might emerge. Here, the focus of our contribution is on the fabrication and optical characterization of silver NP clusters with a spherical shape. We start with the characterisation of the "bulk" dielectric constants of silver NP inks by spectroscopic ellipsometry for different nanoparticle densities (i.e from strongly diluted dispersions to solid randomly packed films). The inks are then used to prepare spherical nanoparticle clusters by an oil-in water emulsion technique. The study of their optical properties demonstrates their ability to support Mie resonances in the visible. These resonances are associated with the excitation of a magnetic dipole, which constitutes a prerequisite to the realization of metamaterials with negative permeability.

Published in:
Photonic And Phononic Properties Of Engineered Nanostructures Ii, 8269, -
Presented at:
Conference on Photonic and Phononic Properties of Engineered Nanostructures II, San Francisco, CA, Jan 23-26, 2012
Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa

 Record created 2012-05-04, last modified 2018-03-17

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