標題: Suppressed ionic effect and low-frequency texture transitions in a cholesteric liquid crystal doped with graphene nanoplatelets
作者: Wu, Po-Chang
Lisetski, Longin N.
Lee, Wei
影像與生醫光電研究所
Institute of Imaging and Biomedical Photonics
公開日期: 4-五月-2015
摘要: We focus on investigating the dielectric behaviors and the low-frequency texture transitions in a cholesteric liquid crystal (CLC) doped with graphene nanoplatelets (GNPs) by means of dielectric spectroscopy and measurements of electro-optical responses. The experimental results indicate that incorporating GNPs at a content of 0.5 wt% into the CLC leads to significant suppression of ionic behaviors, as manifested by the reduction in ionic density, diffusivity, and relaxation frequency. In addition, the electro-optical properties of the GNP-doped CLC cell show the lowered operation voltage for the switching from the planar to focal conic state and the absence of the low-frequency focal-conic-to-uniform-lying-helix texture transition. Such results are attributable to the effects of GNPs as nuclei in the CLC medium, giving rise to the repression of the ionic and electrohydrodynamic effects. (C) 2015 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.23.011195
http://hdl.handle.net/11536/124821
ISSN: 1094-4087
DOI: 10.1364/OE.23.011195
期刊: OPTICS EXPRESS
Volume: 23
起始頁: 11195
結束頁: 11204
顯示於類別:期刊論文