Liquid crystal clad near-infrared metamaterials with tunable negative-zero-positive refractive indices.
Liquid crystal clad near-infrared metamaterials with tunable negative-zero-positive refractive indices.
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DOI：
10.1364/oe.15.003342
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发表时间：
2007-03
期刊：
影响因子：
3.8
通讯作者：
D. Werner;D. Kwon;I. Khoo;A. Kildishev;V. Shalaev
中科院分区：
文献类型：
--
作者：
D. Werner;D. Kwon;I. Khoo;A. Kildishev;V. Shalaev
提出了一种折射率从负到零再到正值的可重构近红外超材料。可重构性是通过在已建立的负折射率超材料上包覆作为覆盖层和基板的液晶薄层，并调节液晶的介电常数来实现的。数值结果表明，该结构的折射率可以改变的范围从？1至+1.8通过调谐液晶介电常数从2到6在波长为1.4？M.
Near-infrared metamaterials that possess a reconfigurable index of refraction from negative through zero to positive values are presented. Reconfigurability is achieved by cladding thin layers of liquid crystal both as a superstrate and a substrate on an established negative-index metamaterial, and adjusting the permittivity of the liquid crystal. Numerical results show that the index of refraction for the proposed structure can be changed over the range from ?1 to +1.8 by tuning the liquid crystal permittivity from 2 to 6 at a wavelength of 1.4 ?m.