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介电流体中金属纳米棒胶体分散体的电光效应

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

作者信息

Golovin Andrii B, Xiang Jie, Park Heung-Shik, Tortora Luana, Nastishin Yuriy A, Shiyanovskii Sergij V, Lavrentovich Oleg D

机构信息

Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA.

Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH 44242, USA.

出版信息

Materials (Basel). 2011 Feb 14;4(2):390-416. doi: 10.3390/ma4020390.

DOI:10.3390/ma4020390
PMID:28879997
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5448487/
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.

摘要

在现代变换光学中，人们探索具有随空间和时间逐点变化特性的超材料，这些超材料适用于诸如“光学隐身斗篷”和“光学黑洞”等器件。我们提出了一种构建空间可变且可切换超材料的方法，该方法基于金属纳米棒（NRs）在介电流体中的胶体分散体，其中由电场梯度产生的介电泳力会形成排列好的NRs的空间可变构型。电场控制NRs的取向和浓度，从而调节介质的光学特性。利用分散在甲苯中的金（Au）纳米棒，我们展示了电诱导折射率变化达到0.1量级。

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