Low voltage blue phase liquid crystal for spatial light modulators

Peng, Fenglin; Lee, Yun‐Han; Luo, Zhenyue; Wu, Shin‐Tson

doi:10.1364/ol.40.005097

Cited by 47 publications

(23 citation statements)

References 30 publications

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“…For example, the working wavelength range is very narrow or limited, and they could only be used for blocking the laser radiations with predictable wavelengths. Active systems, such as optical shutters, spatial light modulators, and frequency agile filters [10][11][12][13][14][15][16][17][18], suffer from the disadvantages of slow response speed and added device complexity. Active devices are typically defined as the components requiring an external triggering signal to activate the protection, where a laser warning device would be indispensable to initiate the action.…”

Section: Introductionmentioning

confidence: 99%

Self-activating liquid crystal devices for smart laser protection

Wang

2016

Liquid Crystals

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Lasers are now extensively used in a multitude of optical devices and photonic systems spanning from sensing, communication, entertainment, medical surgery to military applications. Direct accidental or intentional exposures to high power lasers may lead to severe temporary or even permanent harm of human eye, skin, or optical sensors. The effective laser protection and shielding are currently not only a subject of scientific research but also a potential public safety issue, therefore there is an urgent need to develop the intelligent laser protection devices for keeping human eyes, optical sensors, and other sensitive components from these unintended or intended damages by laser radiations without warning. Self-activating liquid crystal devices undoubtedly represent such an elegant example because they could be autonomously activated to block or attenuate the lasers when the laser intensity is higher than a maximum permissible exposure value. This review is devoted to summarising the up-to-date significant advances of selfactivating liquid crystal devices for potential smart laser protection, including twist-aligned nematic liquid crystal devices, liquid crystal cored waveguide fibre arrays, and photovoltaic/ pyroelectric-hybridised liquid crystal devices. Finally, the review concludes with the perspectives and challenges for the future development of self-activating liquid crystal devices. It is anticipated that this glimpse and further endeavours in the emerging field will help the researchers from different backgrounds towards the fabrication of highly efficient laser protection devices, their real-world widespread applications and beyond. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Self-activating liquid crystal devices for smart laser protection

Wang

2016

Liquid Crystals

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“…To improve response time, several approaches have been investigated, such as dual frequency LCs [8], polymer-stabilized blue phase LCs [9][10][11], ferroelectric LCs [12,13], and polymer network LCs [14,15]. Each technology has its own pros and cons, and it is still quite challenging to satisfy all the abovementioned requirements.…”

Section: Introductionmentioning

confidence: 99%

51‐3: High‐birefringence Liquid Crystal for Phase‐only Spatial Light Modulators

Chen

Huang

Li³

et al. 2018

Symp Digest of Tech Papers

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“…Liquid crystalline (LC) materials and composites of various types have attracted significant attention for diverse applications such as high‐resolution information displays, lasing, photovoltaic devices, light out‐coupling, diffraction gratings, and so on. Columnar liquid crystals, in particular, have been used in the design of new organic ferroelectric materials .…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric switching and electrochemistry of pyrrole substituted trialkylbenzene-1,3,5-tricarboxamides

Meng

Gorbunov

Roelofs

et al. 2017

J. Polym. Sci. Part B: Polym. Phys.

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We explore a new approach to organic ferroelectric diodes using a benzene‐tricarboxamide (BTA) core connected with C10 alkyl chains to pyrrole groups, which can be polymerized to provide a semiconducting ferroelectric material. The compound possesses a columnar hexagonal liquid crystalline (LC) phase and exhibits ferroelectric switching. At low switching frequencies, an additional process occurs, which leads to a high hysteretic charge density of up to ∼1000 mC/m2. Based on its slow rate, the formation of gas bubbles, and the emergence of characteristic polypyrrole absorption bands in the UV–Vis–NIR, the additional process is identified as the oxidative polymerization of pyrrole groups, enabled by the presence of amide groups. Polymerization of the pyrrole groups, which is essential to obtain semiconductivity, is limited to thin layers at the electrodes, amounting to ∼17 nm after cycling for 21 h. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 673–683

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Low voltage blue phase liquid crystal for spatial light modulators

Cited by 47 publications

References 30 publications

Self-activating liquid crystal devices for smart laser protection

Self-activating liquid crystal devices for smart laser protection

51‐3: High‐birefringence Liquid Crystal for Phase‐only Spatial Light Modulators

Ferroelectric switching and electrochemistry of pyrrole substituted trialkylbenzene-1,3,5-tricarboxamides

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