基于金属纳米棒胶体分散的电重构光学超材料
Electrically Reconfigurable Optical Metamaterial Based on Colloidal Dispersion of Metal Nano-Rods in Dielectric Fluid
摘要：
光学超材料以其在成像和隐形隐身方面的纳米级分辨率的惊人承诺抓住了人们的想象力。我们展示了一种构建超材料的方法，其中金属纳米棒的尺寸远小于光的波长，悬浮在流体中，并放置在一个不均匀的电场。由于介电泳效应，电场控制纳米棒的空间分布和取向。纳米棒的场控制放置引起光学效应，诸如变化的折射率、光学各向异性（双折射）和由超材料包围的物体的降低的可见性。
英文摘要：
Optical metamaterials capture the imagination with breathtaking promises of nanoscale resolution in imaging and invisibility cloaking. We demonstrate an approach to construct a metamaterial in which metallic nanorods, of dimension much smaller than the wavelength of light, are suspended in a fluid and placed in a nonuniform electric field. The field controls the spatial distribution and orientation of nanorods because of the dielectrophoretic effect. The field-controlled placement of nanorods causes optical effects such as varying refractive index, optical anisotropy (birefringence), and reduced visibility of an object enclosed by the metamaterial.
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