Diffractive responses to optical wave-train excitations in nanotube-doped nematics

Lee, Wei; Hsiao, Kwo‐Feng

doi:10.1007/s00340-003-1375-4

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Further photoinduced persistent gratings exhibiting a polarization anisotropy have also been investigated in the NLC-CNT system [77,78]. Moreover, a dcfield assisted PR-like nonlinear effect induced by the excitation through either optical or voltage pulses has been observed in nematic films doped with CNTs [79,80].…”

Section: Nlc-cnt Duo As a Pr Materialsmentioning

confidence: 99%

Scientific duo of carbon nanotubes and nematic liquid crystals

Rahman¹,

Lee²

2009

J. Phys. D: Appl. Phys.

139

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With an emphasis on the rectified device performance and related liquid-crystal (LC) properties, this paper presents a timely review of the literature on recent development and understanding of colloidal systems of carbon nanotubes (CNTs) in thermotropic nematic liquid crystals (NLCs). The dispersion and stability of CNTs in a LC hydrosol are discussed. The effect of CNT inclusion on the physical properties of NLCs is addressed. It is clear that the effect of adding nanotubes to the LC host and the extent of improvement in LC device performance by doping CNTs, if any, depend strongly on the details of the interaction between the nanotubes and the host molecules. It shows that the combination of CNTs and NLCs is not only of scientific interest but also of technical significance.

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Section: Nlc-cnt Duo As a Pr Materialsmentioning

confidence: 99%

Scientific duo of carbon nanotubes and nematic liquid crystals

Rahman¹,

Lee²

2009

J. Phys. D: Appl. Phys.

139

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“…The results indicated that the colloidal system possesses excellent PR response characteristics, permitting the grating formation time of about 30 ms deduced from beam-coupling measurements [32][33][34][35][36]. In addition, a field-assisted PR-like nonlinear effect induced by either the optical pulse train or voltage pulses has been observed in nematic films doped with MWCNTs [37,38]. These findings concerning the enhanced orientational PR effect in LC are scientifically and historically significant in that this is how the LC-CNT research commenced.…”

mentioning

confidence: 74%

Electric-Field Effects in Dilute Suspensions of Carbon Nanotubes Dispersed in Nematic Liquid Crystals

Rahman

Lee

2010

KEM

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Colloids composed of liquid-crystal hydrosols exhibit a rich set of interesting phenomena. The coupling between liquid-crystalline media and colloidal particles plays an essential role leading to an abundant source of new physics. In the last few years, peculiar behaviors of carbon-nanotube-doped calamitic liquid crystals have attracted considerable attention. This paper provides a brief introduction to this alluring subject for its on-going research development in this laboratory. First presented are our current understandings of the nematic colloidal system comprising carbon nanotubes and of their possible orientation and dynamics under the application of an external field. Various electro-optical and electrical properties of a liquid-crystal display rectified by the nanoscale carbonaceous guest are then addressed to a larger extent. Dielectric relaxation obtained from a nematic impregnated with carbon nanotubes is also discussed. With historical significance for the dawn of the liquid-crystal–carbon-nanotube research, several important findings of enhanced nonlinear optical properties in typical nematic mesomaterials consisting of suspended nanotubes are delineated. With the new colloidal systems of elongated nanoscale solids dispersed in anisotropic fluids in the mesophase, many new intriguing phenomena are awaiting theoretical and experimental explorations. Collaborations are called to draw attention of interested theoretical physicists, in particular.

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