Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid

Details Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid

2011-02-21

arxiv.org/abs/1102.4252v1

Materials 2011, 4(2), 390-416

Physics

Condensed Matter

Soft Condensed Matter

27 pages, 23 figures

Scientific paper

10.3390/ma4020390

In modern transformation optics, one explores metamaterials with properties that vary from point to point in space and time, suitable for applications in devices such as an "optical invisibility cloak" and an "optical black hole". We propose an approach to construct spatially varying and switchable metamaterials that are based on colloidal dispersions of metal nano-rods (NRs) in dielectric fluids, in which dielectrophoretic forces, originating in the electric field gradients, create spatially varying configurations of aligned NRs. The electric field controls orientation and concentration of NRs and thus modulates the optical properties of the medium. Using gold (Au) NRs dispersed in toluene, we demonstrate electrically induced change in refractive index on the order of 0.1.

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