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Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid
Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA
Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH 44242, USA
Institute of Physical Optics, 23 Dragomanov Str. Lviv, 79005, Ukraine
* Author to whom correspondence should be addressed.
Received: 3 November 2010; in revised form: 3 February 2011 / Accepted: 10 February 2011 / Published: 14 February 2011
Abstract: In modern transformation optics, one explores metamaterials with properties that vary from point to point in space and time, suitable for application 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.
Keywords: optical metamaterial; dielectrophoretic effect; gold nano-rods; gradient of refractive index; field induced birefringence; optical cloak; liquid crystal formed by metal particles
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Golovin, A.B.; Xiang, J.; Park, H.-S.; Tortora, L.; Nastishin, Y.A.; Shiyanovskii, S.V.; Lavrentovich, O.D. Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid. Materials 2011, 4, 390-416.
Golovin AB, Xiang J, Park H-S, Tortora L, Nastishin YA, Shiyanovskii SV, Lavrentovich OD. Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid. Materials. 2011; 4(2):390-416.
Golovin, Andrii B.; Xiang, Jie; Park, Heung-Shik; Tortora, Luana; Nastishin, Yuriy A.; Shiyanovskii, Sergij V.; Lavrentovich, Oleg D. 2011. "Electro-Optic Effects in Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid." Materials 4, no. 2: 390-416.