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arXiv 1102.4252cond-mat.softphysics.optics
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金属纳米棒在介质流体中胶态分散的电光效应

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

Andrii B. Golovin, Jie Xiang, Heung-Shik ParkLuana Tortora, Yuriy A. NastishinSergij, V. Shiyanovskii, Oleg D. Lavrentovich

摘要:

在现代变换光学中,人们探索具有在空间和时间上从点到点变化的特性的超材料,适用于诸如“光学隐形衣”和“光学黑洞“之类的设备中的应用。我们提出了一种方法来构建空间变化和可切换的超材料,是基于胶体分散的金属纳米棒(NR)在介电流体中,其中介电泳力,起源于电场梯度,创建空间变化的配置对齐NR。电场控制NR的取向和浓度,从而调制介质的光学性质。使用分散在甲苯中的金(Au)NR,我们证明了电诱导的折射率变化的顺序为0.1。

英文摘要:

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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