Light-controllable reflection wavelength of blue phase liquid crystals doped with azobenzene-dimers

Chen, Xingwu; Wang, Ling; Li, Chenyue; Xiao, Jiumei; Ding, Hongyan; Liu, Xin; Zhang, Xiaoguang; He, Wanli; Yang, Huai

doi:10.1039/c3cc46117c

Cited by 76 publications

(31 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been experimentally and theoretically confirmed that the BP II and BP I exhibit simple cubic and body-centered cubic nanostructures (Figure 8(a)), respectively. Due to the unique 3D structures of BPLCs, they exhibit many revolutionary features such as optically isotropic and alignment-layer-free, while possess superior electrooptic properties and non-linear optical responses comparable to nematics [134][135][136][137][138][139][140][141][142][143][144][145][146][147][148]. Furthermore, because of the tightly wound spatial arrangement of the crystalline axis, the scattering loss due to thermal fluctuations of the director axis is considerably smaller than nematics, allowing longer interaction length and higher process efficiency.…”

Section: Fibre Arrays Filled With Blue Phase Liquid Crystalsmentioning

confidence: 98%

Self-activating liquid crystal devices for smart laser protection

Wang

2016

Liquid Crystals

Self Cite

View full text Add to dashboard Cite

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

show abstract

Section: Fibre Arrays Filled With Blue Phase Liquid Crystalsmentioning

confidence: 98%

Self-activating liquid crystal devices for smart laser protection

Wang

2016

Liquid Crystals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sharing the similarity of using achiral azobenzene, Liu et al further confirmed the change of lattice spacing by Kössel diagrams [105]. So far, the largest tuning range in such systems, from red (*650 nm) to blue (*500 nm), was achieved by Chen et al using azobenzene dimers [106]. A fieldinduced transition from BPI to the cholesteric phase was also observed.…”

Section: Control Of Bp Photonic Bandgapmentioning

confidence: 67%

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

View full text Add to dashboard Cite

Blue phase liquid crystals (BPLCs) have attracted considerable attention in recent years owing to their unique periodic structure and electro-optic properties. Besides the potential applications in the next generation display, BPLC with a cubic lattice structure can be regarded as a self-organized three-dimenstional (3D) photonic crystal that can be applied for photonic devices such as optical filter, optical attenuator, phase modulator, laser source and so on. This chapter will introduce the formation of BPLCs from both theoretical and experimental points of view. The stability and temperature range of BPLCs are also discussed followed by its photonic crystal structure, lattice orientation and phase identification. After a basic overview, this chapter will further introduce the applications of BPLCs, including controllability of photonic band gap with external fields, fast electro-optic Kerr effect, and optical nonlinear effect. This short summary shows that the century old intriguing BPLCs have diverse opportunities to offer in modern photonic materials and devices. Moreover, the current challenges in this area are expected to spark innovative ideas leading toward the design and engineering of new chiral materials that may furnish suitable BPLCs to produce advanced photonic materials that have desirable properties and functions.

show abstract

“…The periodic nanostructures are self-organized from the so-called double-twisted cylinders that are usually stabilized by the formation of defects or disclinations. As the 3D PCs, BPs feature remarkable bandgap tunability over an extensive spectrum in response to various external stimuli such as temperature [35,36], mechanical strength [37], electric field [38], and light [39][40][41]. The spectral band gap position of selective reflection can be readily predetermined by varying the chiral fraction of BP mixtures.…”

Section: Lc Blue Phasementioning

confidence: 99%

Liquid Crystals for Responsible Photonic Crystals

Kim¹,

Kurihara²

2018

Theoretical Foundations and Application of Photonic Crystals

View full text Add to dashboard Cite

The photonic crystals (PCs) exhibit photonic band gap (PBG), inhibiting specific wavelength of light decided by structural periodicity. PCs are a new class of periodic dielectric media that can provide novel ways to manipulate and control light. Researchers have recently devoted extensive efforts to fabricating PCs with controlled symmetry, size, and defects on a large scale and tuning of PBG. Liquid crystalline (LC) materials exhibiting self-organization, phase transition, and molecular orientation behaviors in response to external stimuli are attracting significant attention for the bottom-up nanofabrication and tuning of advanced photonic materials and devices. Here, we will introduce selforganization of PCs from LCs and photoswitching mechanism of PBG based on phase transition and anisotropic orientation of LCs.

show abstract

Light-controllable reflection wavelength of blue phase liquid crystals doped with azobenzene-dimers

Cited by 76 publications

References 24 publications

Self-activating liquid crystal devices for smart laser protection

Self-activating liquid crystal devices for smart laser protection

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Liquid Crystals for Responsible Photonic Crystals

Contact Info

Product

Resources

About