Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes

doi:10.1016/j.carbon.2019.06.084

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	Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes
	Y.Y.Ji; F.Fan; S.T.Xu; J.P.Yu; Y.Liu; X.H.Wang; S.J.Chang
	2019
发表期刊	Carbon
ISSN	0008-6223
卷号	152 页码:865-872
摘要	Dual-frequency liquid crystals (DFLCs), the mixture of positive and negative liquid crystal (LC) molecules, exhibit unique alternating (AC) frequency dependent anisotropic properties. Carbon nanotube (CNT), as a novel nanomaterial with strong anisotropy, has attracted much attention in recent years. Herein, we investigate the tunable terahertz birefringence and phase shift characteristics of the DFLC doped with CNT (CNT-LC) by using the terahertz time-domain polarization spectroscopy. The results show that the CNT-LC (1.5 wt%) can reach 0.5 pi at 0.793 THz, which can be used as a tunable THz phase shifter that is 0.127 higher than the pure DFLCs. Furthermore, through measuring the output polarization state, it is confirmed that the dielectric anisotropy enhancement mechanism of CNT-LC originates from the surface interaction between CNTs and LC molecules. Therefore, a tunable quarter-wave plate with the active polarization conversion from linearly polarized (LP) to LP or LP to circularly polarized (CP) can be realized at 0.925 THz in the CNT-LC, while the pure DFLC cannot be achieved at the same frequency. The dielectric anisotropy enhancement of CNT-LC shows its utility in the improvement of various tunable terahertz LC phase shifter and wave plate. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	Terahertz,Dual-frequency liquid crystals,Carbon nanotube,Phase,devices,permanent gratings,phase-shifter
DOI	10.1016/j.carbon.2019.06.084
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/63311
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y.Y.Ji,F.Fan,S.T.Xu,et al. Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes[J]. Carbon,2019,152:865-872.
APA	Y.Y.Ji.,F.Fan.,S.T.Xu.,J.P.Yu.,Y.Liu.,...&S.J.Chang.(2019).Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes.Carbon,152,865-872.
MLA	Y.Y.Ji,et al."Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes".Carbon 152(2019):865-872.

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