Metallic surfaces as alignment layers for nondisplay applications of liquid crystals

Garbovskiy, Yuriy; Reisman, Lindsay; Celiński, Z.; Camley, R. E.; Glushchenko, Anatoliy

doi:10.1063/1.3552674

Cited by 19 publications

(10 citation statements)

References 16 publications

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“…In a typical capacitive arrangement, where a liquid crystal cell is sandwiched between two metal electrodes and no bias voltage is applied ( = 0 V), the initial alignment of the liquid crystal molecules is achieved through coating the boundary surfaces (preferably the top and bottom layer of the cell) with a thin layer of polyimide film and then mechanically rubbing them using a velvet cloth. The rubbing creates microscopic grooves in the polyimide surfaces ( Figure 1) and enables preferred alignment for the liquid crystal molecules in the unbiased state [21,22] (Figures 2(a) and 2(b)). In electromagnetic simulations, these extremely thin polyimide layers can be neglected to a good approximation.…”

Section: Anisotropy Statesmentioning

confidence: 99%

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Yaghmaee

Karabey

Bates

et al. 2013

International Journal of Antennas and Propagation

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An overview of liquid crystal technology for microwave and millimeter-wave frequencies is presented. The potential of liquid crystals as reconfigurable materials arises from their ability for continuous tuning with low power consumption, transparency, and possible integration with printed and flexible circuit technologies. This paper describes physical theory and fundamental electrical properties arising from the anisotropy of liquid crystals and overviews selected realized liquid crystal devices, throughout four main categories: resonators and filters, phase shifters and delay lines, antennas, and, finally, frequency-selective surfaces and metamaterials.

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Section: Anisotropy Statesmentioning

confidence: 99%

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Yaghmaee

Karabey

Bates

et al. 2013

International Journal of Antennas and Propagation

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“…The orientation of the LC near the surface is also material dependent. Various low loss plasmonic metals, such as silver, exhibit homeotropic alignment due to their surface energy 28 , ultimately inhibiting tunability. While gold has been used extensively in LC tunable plasmonics, its intrinsic intraband absorption in the visible spectral domain makes it unsuitable for full visible colour generation.…”

Section: Resultsmentioning

confidence: 99%

Polarization-independent actively tunable colour generation on imprinted plasmonic surfaces

et al. 2015

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Structural colour arising from nanostructured metallic surfaces offers many benefits compared to conventional pigmentation based display technologies, such as increased resolution and scalability of their optical response with structure dimensions. However, once these structures are fabricated their optical characteristics remain static, limiting their potential application. Here, by using a specially designed nanostructured plasmonic surface in conjunction with high birefringence liquid crystals, we demonstrate a tunable polarization-independent reflective surface where the colour of the surface is changed as a function of applied voltage. A large range of colour tunability is achieved over previous reports by utilizing an engineered surface which allows full liquid crystal reorientation while maximizing the overlap between plasmonic fields and liquid crystal. In combination with imprinted structures of varying periods, a full range of colours spanning the entire visible spectrum is achieved, paving the way towards dynamic pixels for reflective displays.

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“…An average dielectric permittivity of a typical nematic liquid crystal E7 equals 10. 39 ). The estimated value of the electric field is very high and is enough to trap ions.…”

mentioning

confidence: 93%

Ion trapping by means of ferroelectric nanoparticles, and the quantification of this process in liquid crystals

Garbovskiy

Glushchenko

2015

Applied Physics Letters

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Nanoparticles embedded in liquid crystals can trap mobile ions and decrease their concentration. In this paper, we generalize the nanoparticles-based approach and, through the quantitative analysis, identify the ferroelectric micro- and nanomaterials as the most promising “ion traps” that ensure close to 100% liquid crystal purification. We demonstrate that the treatment of liquid crystals with ferroelectric materials leads to a two-order of magnitude decrease in their electrical conductivity. This value exceeds previous data reported for similar systems by a factor of 10. Ferroelectric nanoparticles, when dispersed and stabilized in liquid crystals, act as highly efficient permanent ion traps, solve the problem of uncontrolled ionic contaminations, and eliminate the negative effects caused by ions.

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Metallic surfaces as alignment layers for nondisplay applications of liquid crystals

Cited by 19 publications

References 16 publications

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Polarization-independent actively tunable colour generation on imprinted plasmonic surfaces

Ion trapping by means of ferroelectric nanoparticles, and the quantification of this process in liquid crystals

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