In-plane switching of cholesteric liquid crystals for visible and near-infrared applications

Xianyu, Haiqing; Faris, S. M.; Crawford, Gregory P.

doi:10.1364/ao.43.005006

Cited by 90 publications

(84 citation statements)

References 19 publications

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“…Adaptive temperature responsive IR reflectors have recently been reported to reflect light at elevated temperatures and transmit it at lower temperatures [22,23]. Manually controlled electrically switchable IR/visible reflectors based on inorganic and organic materials can reduce the thermal transmission through a window [24,25]. However, these reflectors reflect only a limited fraction of incident solar light, and some of them interfere with visible light.…”

Section: Introductionmentioning

confidence: 99%

Cell thickness dependence of electrically tunable infrared reflectors based on polymer stabilized cholesteric liquid crystals

Haan

Khandelwal

et al. 2017

Sci. China Mater.

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We reported here the fabrication of the electrically tunable infrared (IR) reflectors based on the polymer stabilized cholesteric liquid crystal (PSCLC) with negative dielectric anisotropy. A systematic study of the influence of cell gap on the electrically tunable reflection bandwidth was performed. When a direct current (DC) electric field was applied, the reflection bandwidth red shifted in the cells with small cell gap, whereas the bandwidth broadening was observed in the cells with large cell gap. It is therefore reasonable to deduct that the reflection is dictated by the pitch gradient steepness which strongly relies on the cell thickness. The results reveal that for making PSCLC based IR reflector windows with electrically induced bandwidth broadening, a minimal cell gap thickness is required. The resulted IR reflectors possess a short native switching time and long-term operation stability, and are potentially applicable as smart energy saving windows in buildings and automobiles.

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Section: Introductionmentioning

confidence: 99%

Cell thickness dependence of electrically tunable infrared reflectors based on polymer stabilized cholesteric liquid crystals

Haan

Khandelwal

et al. 2017

Sci. China Mater.

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“…While the phase of thermotropic LC characteristic ordering depends only on temperature [11], thermotropic LC phases are: nematic, smectic, and cholesteric [12]. Cholesteric liquid crystals have many advanced technology applications [13] like liquid crystal displays [14], optical filters [15], imaging systems [16], chromatography techniques [17], optical storage systems [18], temperature sensors [19] and medical thermography [20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, physical and biological properties of some cholesterol derivatives

2016

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A series of new cholesterol derivatives have been prepared via Mitsunobu reaction. The reaction was monitored by thin-layer chromatography (TLC) technique. All new compounds were characterized by melting points, elemental analysis, FT-IR, 1 H, 13 C and 2D-NMR spectroscopy. The antibacterial and antifungal activity of these derivatives was also determined. The phase transitions of the prepared derivatives were measured with the aid of differential scanning calorimetry. The textures of the mesophases have been determined with a hot stage equipped polarizing microscope, also the electrical conductivity of the solutions of these liquid crystals measured by electrical conductivity meter. The analysis showed that these prepared derivatives were liquid crystals.

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“…Be− sides, the helical pitch is very sensitive to the influence of ex− ternal factors such as electric or magnetic fields, temperature, pressure etc. Chiral nematics have already been shown as ef− fective IR/vis light modulators due to electrically−controlled helical period [1,2], switchable two−dimensional (2D) diffrac− tive gratings [3] or the media for dynamic holography with high diffraction efficiency [4,5]. The use of photosensitive chiral additives allowed for a substantial change of the intrinsic helical pitch that could be employed for colour image recording [6,7], tunable CLC lasers [8,9] or light polarisation control [10,11] with very low energy needed.…”

Section: Introductionmentioning

confidence: 99%

Light-controlled helical pitch and dynamic gratings

Boychuk

Gerus

Iljin

et al. 2009

Opto-Electronics Review

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A chiral nematic liquid crystal (LC) with a photo-sensitive chiral agent is employed for a light-controlled modulation of optical activity and used as a model substance for a dynamic diffraction grating recording. The described liquid crystalline system has shown a strong nonlinear response with effective parameter of cubic nonlinearity being much greater of that characteristic of the orientational nonlinearity of LC. A simple mathematical model of light diffraction on the grating of modulated optical activity was developed. Calculated values of intensities and polarisation states of diffracting beams have shown very good agreement with the experimental data. LC systems with light-controlled chirality could be promising media for nonlinear optical applications or all-optical switching devices.

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In-plane switching of cholesteric liquid crystals for visible and near-infrared applications

Cited by 90 publications

References 19 publications

Cell thickness dependence of electrically tunable infrared reflectors based on polymer stabilized cholesteric liquid crystals

Cell thickness dependence of electrically tunable infrared reflectors based on polymer stabilized cholesteric liquid crystals

Synthesis, characterization, physical and biological properties of some cholesterol derivatives

Light-controlled helical pitch and dynamic gratings

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