Issue 39, 2014

Electrically tunable negative refraction in core/shell-structured nanorod fluids

Abstract

We theoretically investigate optical refraction behavior in a fluid system which contains silica-coated gold nanorods dispersed in silicone oil under an external electric field. Because of the formation of a chain-like or lattice-like structure of dispersed nanorods along the electric field, the fluid shows a hyperbolic equifrequency contour characteristic and, as a result, all-angle broadband optical negative refraction for transverse magnetic wave propagation can be realized. We calculate the effective permittivity tensor of the fluid and verify the analysis using finite element simulations. We also find that the negative refractive index can vary with the electric field strength and external field distribution. Under a non-uniform external field, the gradient refraction behavior can be realized.

Graphical abstract: Electrically tunable negative refraction in core/shell-structured nanorod fluids

Article information

Article type
Paper
Submitted
31 Mar 2014
Accepted
19 Jun 2014
First published
19 Jun 2014

Soft Matter, 2014,10, 7696-7704

Author version available

Electrically tunable negative refraction in core/shell-structured nanorod fluids

Z. Su, J. Yin, Y. Guan and X. Zhao, Soft Matter, 2014, 10, 7696 DOI: 10.1039/C4SM00700J

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