Development and applications of cholesteric liquid crystals

Coates, David

doi:10.1080/02678292.2015.1020454

Cited by 38 publications

(30 citation statements)

References 38 publications

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“…With an electrically controllable pitch of CLCs as reported by Xiang et al and Xianyu et al [ 29 , 30 ], a CLC polarization rotator can be utilized in various applications, such as lasers, displays, communications, etc. In the past few decades, the research scope of CLCs has been mainly limited to the category of displays, light shutters, lasers, and smart windows [ 1 , 2 , 4 , 5 , 12 , 13 , 14 , 15 , 21 , 26 , 31 , 32 , 33 , 34 ]. The authors hope that the reported investigations and analysis can further extend to other fields, especially for the ability to rotate the polarization orientation using external stimuli.…”

Section: Discussionmentioning

confidence: 99%

“…Over many decades, scientists in both the academic and industrial sectors have studied and exploited the remarkable optical properties of chiral nematic liquid crystals (LCs) (historically known as cholesteric LCs (CLCs)), particularly the well-known phenomenon of selective Bragg reflection [ 1 ]. Selective reflection can be observed when the wavelength of the incident light is comparable to the pitch of the CLC [ 1 , 2 ]. The central reflection wavelength ( λ o ) defined by the Bragg condition can be described as λ o = nP 0 cos θ , where n , P 0 , and θ are the average refractive index of the LCs, pitch, and the angle between the incident light and the helical axis of the CLC, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

et al. 2017

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A linear-polarization rotator based on the optically tunable pitch of chiral-azobenzene-doped liquid crystals (CAdLCs) has been investigated. It is shown that the orientation of linearly polarized (LP) light can be optically tuned using CAdLCs and that the transmitted light possesses a good degree of linear polarization (DoLP). Experimental and simulation (4 × 4 Berreman matrix) results show that the rotation angle is dependent on the pitch as well as the number of turns of the cholesteric LC helix. Some causes to affect the DoLP of the output LP lights during photoisomerization are also discussed. Moreover, a calibration term, β(t), is also introduced to elucidate the behavior of the discontinuous change of the CAdLC pitch in a fixed cell thickness.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

et al. 2017

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“…[13][14][15][16][17][18][19] In this article, we have developed a bandwidth-reflective LC film based on self-assembly of hydrogen bonds (Hbonds) of chiral molecules, the bandwidth of the selective reflection spectrum of this film can be greatly changed with ruptured or self-assembly of H-bond of chiral molecules reversibly. The self-assembly of H-bond of chiral molecules have dependence of temperature.…”

Section: Introductionmentioning

confidence: 98%

Thermally bandwidth-controllable reflective liquid crystal film from rupture and self-assembly of hydrogen bonds

et al. 2016

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A cholesteric liquid crystal (Ch-LC) composite containing a hydrogen bond (H-bond) chiral dopant (HCD) was prepared and filled into a planar treated cell. When the cell was heated, the selective reflection of the cell exhibited an unusual red shift. One of the reasonable mechanisms was that the H-bonds of HCD ruptured when the temperature was high, and the HCD split into two new chiral dopants (CDs), which made the whole helical twisting power (HTP) value in the composite changed a lot, thus the pitch length of the composite changed. On the basis of this mechanism, when the composite was polymerised at the temperature of H-bonds of HCD ruptured, the bandwidth of the obtained film can be tuned form wider to narrower reversibly by the rupture and self-assembly of H-bonds chiral molecules as the temperature changed, respectively. ARTICLE HISTORY

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“…Chiral liquid crystals (LCs), including chiral smectic phase, [1][2][3][4][5][6] chiral nematic phase, [2,[5][6][7][8][9] cholesteric phase, [4,[10][11][12] blue phase [12][13][14][15] and so on, have attracted much interest because of their unique optical and electrical properties, such as the selective reflection of light, [3,5,7,8,12] thermochromism [16,17] and ferroelectricity. [1,6,18,19] Fluorinated LCs are a class of important LCs for their fascinating properties such as the high polarity, dielectric anisotropy, optical anisotropy and viscoelastic properties.…”

Section: Introductionmentioning

confidence: 99%

1,2-Propanediol-linked chiral symmetric and non-symmetric liquid crystal dimers containing trifluoromethyl

Yao

Feng

et al. 2016

Liquid Crystals

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2016): 1,2-Propanediol-linked chiral symmetric and nonsymmetric liquid crystal dimers containing trifluoromethyl, Liquid Crystals, ABSTRACT Four symmetric and non-symmetric chiral liquid crystal dimers containing trifluoromethyl groups, termed as TFBA-PD-TFBA, UEBBA-PD-TFBA, UEBA-PD-TFBA and UEA-PD-TFBA, respectively, have been synthesised and characterised. UEA-PD-TFBA exhibited chiral nematic phase, whereas the other three dimers displayed chiral smectic A phase. X-ray diffraction (XRD) has revealed the structure of the smectic A phase for TFBA-PD-TFBA to be intercalated, whereas that for UEBBA-PD-TFBA and UEBA-PD-TFBA to be monolayer and interdigitated, respectively. In addition, the weaker peak corresponding to a shorter layer spacing was observed for UEBBA-PD-TFBA and UEBA-PD-TFBA. Considering the results of XRD measurements and computer simulations, the structural model corresponding to the shorter layer spacing is assigned as horseshoe-like shape. The absence of smectic behaviour for UEA-PD-TFBA reveals that the weaker aromatic-aromatic interactions cannot stabilise the smectic A phase. ARTICLE HISTORY

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Development and applications of cholesteric liquid crystals

Cited by 38 publications

References 38 publications

Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

Thermally bandwidth-controllable reflective liquid crystal film from rupture and self-assembly of hydrogen bonds

1,2-Propanediol-linked chiral symmetric and non-symmetric liquid crystal dimers containing trifluoromethyl

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